NikonGear'23

Gear Talk => Lens Talk => Topic started by: Knut S on June 12, 2016, 23:11:55

Title: Nikkor 105mm f/2.5
Post by: Knut S on June 12, 2016, 23:11:55
Just got this old classic Nikkor, and what a beauty it is! I've had a "one-lens-day" today for getting to know this lens. Pure joy. Really like the dof-control on this lens. It's up there with the 35mm 1.4 & 50mm 1.2.  I'll be happy if you will join this thread and show what this lens can deliver.
All pics D3x @2.5
Title: Re: Nikkor 105mm f/2.5
Post by: Bjørn Rørslett on June 13, 2016, 01:07:46
I think we have already had 105/2.5 thread(s), but why not hammer the message through once again?

Personally I think the 105/2.5 AI and the Nikon Df simply were made for each other. The combination simply is so extraordinarily good and synergetic. This lens covers everything from (relatively) close-ups to portraits and landscapes with the same ease.

There is a faster sibling, the 105/1.8 AIS, that shares much of the same features and some claim it is even better for landscape work. In direct A/B comparison, however, I didn't find much of a difference, and the faster lens by its bigger bulk makes for less smooth handling than the f/2.5 model.



Title: Re: Nikkor 105mm f/2.5
Post by: Bjørn Rørslett on June 13, 2016, 01:18:59
A few examples of 105/2.5 images captured with the Nikon Df in recent years.

(the scenery of last one should be familiar to KS)

Title: Re: Nikkor 105mm f/2.5
Post by: Tristin on June 13, 2016, 01:39:59
I don't mind more threads on the 105/2.5!  The 105/1.8 certainly excels in field curvature, or lack of, CA and flare, but all else is identical.  I think for general use, the 105/2.5 has the upper hand for it's filter size alone, though the lighter weight is certainly nice.  The 105s are real gems that set an extremely high bar for the money spent.
Title: Re: Nikkor 105mm f/2.5
Post by: Knut S on June 13, 2016, 01:52:11
Thanks, Bjørn. Inspirational pictures, as usual from your hand. I really like the 3D rendering of this lens. And yes, I know exactly where #4 is taken. Haha.. ::)
Title: Re: Nikkor 105mm f/2.5
Post by: richardHaw on June 13, 2016, 02:40:49
I like the elvis on the cadillac pic :o :o :o just because it is elvis ::)

here's mine
Title: Re: Nikkor 105mm f/2.5
Post by: Matthew Currie on June 13, 2016, 07:30:47
It's a little long for a lot of things on DX, but it has that je ne sais quoi.
Title: Re: Nikkor 105mm f/2.5
Post by: Bjørn J on June 13, 2016, 18:28:49
For some reason which I can't explain, I have never owned the 105/2,5. To rectify the situation, I have now aquired two of them, both arrived a few days ago. One is an Ai-converted K, the other is Ai-S. Both in mint condition. I enjoy and love using these classic Nikkors more and more, and have a decent collection - 16/3,5 (x2), 20/2,8, 24/2, 28/2, 35/1,4, 50/1,2, 105/2,5 (x2) and 180/2,8 ED.
Title: Re: Nikkor 105mm f/2.5
Post by: chris dees on June 13, 2016, 18:44:38
One of my favorite MF Nikkors.
I have "only" the very old ones. Nippon Kogaku 10.5cm (1963) and 105mm (1971), both Sonar's and the Nikkor 105mm PC (1973) which is a Gauss.
These two (105 PC) are from my last trip to Thailand.
Title: Re: Nikkor 105mm f/2.5
Post by: Knut S on June 13, 2016, 20:37:08
Matthew and Chris; beautiful! Thanks for shearing. Chris, #2 is awesome.  :)
Title: Re: Nikkor 105mm f/2.5
Post by: the solitaire on June 13, 2016, 20:37:48
If it's about the 105mm f2,5, I'll join.

I currently only own a ~1967 Nippon Kogaku 105mm f2,5 Nikkor-P with single amber coating.

(https://c3.staticflickr.com/8/7421/27417858322_f332a6e19e_b.jpg)

Here are a few sample pictures

(https://c2.staticflickr.com/8/7753/27573245825_98b2fe3a50_b.jpg)

(https://c7.staticflickr.com/2/1526/25061886830_5759c6b3f3_b.jpg)

(https://c4.staticflickr.com/2/1542/25307966355_be3eca5892_b.jpg)

(https://c5.staticflickr.com/1/604/23181240516_fd866da033_b.jpg)

And then these made with the 105mm f2,5 Nikkor-P.C

(https://c7.staticflickr.com/6/5769/23216165310_22147db0e3_b.jpg)

(https://c7.staticflickr.com/2/1641/23814895334_6a96004fec_b.jpg)

(https://c8.staticflickr.com/1/773/20177199703_f0507d8ae3_b.jpg)

(https://c7.staticflickr.com/1/654/20788811022_8324a03c5f_b.jpg)

EXIF incorrect on this one. I also used the 105mm f2,5 Nikkor-P.C in this case not wide open but at f2,8

(https://c5.staticflickr.com/1/327/20255663652_ce29732ff7_b.jpg)
Title: Re: Nikkor 105mm f/2.5
Post by: elsid on June 13, 2016, 21:55:25
This morning I became the proud owner of a used Df in "super mint" condition. Price was Euro 1,500. In the afternoon I was out in a park with the camera and the 105mm 2.5 AI. Here is a sample of the crop.
Title: Re: Nikkor 105mm f/2.5
Post by: Jakov Minić on June 13, 2016, 21:56:34
Bjørn's delicate sound of snow is hyper mega extra turbo special!

Title: Re: Nikkor 105mm f/2.5
Post by: Knut S on June 13, 2016, 23:42:46
#1 I met this funny guy yesterday.. ;D
#2 I'm so weak for reflections..
And thanks for sharing these beautiful pictures. So inspiring!
Title: Re: Nikkor 105mm f/2.5
Post by: Bjørn Rørslett on June 15, 2016, 10:31:04
Knut, are the reflections from Å? Something about the 'rorbuer' reminds me of that small village in Lofoten.

To continue with the venerable 105/2.5, although it can deliver the most delicate rendition with pastel hues, it certainly can make a scene into a graphical image if so required.

This is from the DONG energy works in Copenhagen ('dong' in Norwegian has a pretty vulgar connotation).

Title: Re: Nikkor 105mm f/2.5
Post by: Bjørn Rørslett on June 15, 2016, 22:54:39
The softer side of the 105/2.5 (AI) is well documented by this ice cream portrait of Jan Anne.
Title: Re: Nikkor 105mm f/2.5
Post by: Knut S on June 16, 2016, 00:15:27
You are absolutly right Bjørn, Å is the place. And that Dong(!) picture is just brilliant.  :) I just have to say that the 105mm really is growing on me. And it's not only on the Df it is brilliant. On the D3x it really shines, too.  ;) Really a potato lens, can be used for everything. And that silky smooth focusing.. Mmmm. Those old Nikkors are really something.  ;D
Title: Re: Nikkor 105mm f/2.5
Post by: Knut S on June 17, 2016, 00:50:40
A tight one. D3x.
Title: Re: Nikkor 105mm f/2.5
Post by: Bjørn Rørslett on June 17, 2016, 01:04:10
Move over a few metres and this scene appears (Df, 105/2.5)

Title: Re: Nikkor 105mm f/2.5
Post by: Tristin on June 17, 2016, 01:31:50
Knut and Bjorn, those last two are very pleasing to look at! :-)
Title: Re: Nikkor 105mm f/2.5
Post by: MFloyd on July 13, 2016, 05:40:05
More than 40 years separate the body and the lens. The latter being revamped to AI and equipped with a chip, thanks to the joint efforts of Bjørn and Erik  :):

(https://farm9.staticflickr.com/8849/27995060720_2615ea1cb2_k.jpg)
Title: Re: Nikkor 105mm f/2.5
Post by: tdoan on July 13, 2016, 06:49:26
I can't take this anymore!!!  all this flaunting... so I just ordered mine, 2 minutes ago.  can't wait  :D
Title: Re: Nikkor 105mm f/2.5
Post by: richardHaw on July 13, 2016, 07:29:02
I can't take this anymore!!!  all this flaunting... so I just ordered mine, 2 minutes ago.  can't wait  :D

you should buy all 5 versions  :o :o :o!

1: tickmark
2: chrome nose sonnar version
3: new-nikkor
4: Ai
5: Ai-S

That's good! everything has a start
Title: Re: Nikkor 105mm f/2.5
Post by: Bjørn Rørslett on July 13, 2016, 07:40:55
Then, add the two versions for Nikon S-mount rangefinders (with or without locking studs on the front barrel). They work via an adapter on mirrorless cameras if you haven't got an S rangefinder. (I have most S models, but prefer using these old-timer optics on a Sony A7. Film is so dead).
Title: Re: Nikkor 105mm f/2.5
Post by: tommiejeep on July 13, 2016, 08:16:37
I can't take this anymore!!!  all this flaunting... so I just ordered mine, 2 minutes ago.  can't wait  :D

Yup, Tien,
This a tough place for creating GAS.  I have 5 105mm lenses because I love the FL but these days I chose between them and sell the loser (s).  I passed on two 105 f1.8Ais not that long ago but may eventually get one  ;) . I use them on the Df, D700 , D750 and Sony a7II.  I have even used on an EM1  :) . I'm in the same boat with 135mm lenses   :(

Bjørn, love the Ice Cream image  :)
Tom
Title: Re: Nikkor 105mm f/2.5
Post by: richardHaw on July 13, 2016, 09:17:53
Then, add the two versions for Nikon S-mount rangefinders (with or without locking studs on the front barrel). They work via an adapter on mirrorless cameras if you haven't got an S rangefinder. (I have most S models, but prefer using these old-timer optics on a Sony A7. Film is so dead).

yes! i am looking for a cheap "mountain nikkor" for myself :o :o :o
Title: Re: Nikkor 105mm f/2.5
Post by: ArendV on July 13, 2016, 09:19:13
I use my AI'd 105/2.5 P early Gauss version on a Sony A7

(https://c1.staticflickr.com/9/8773/18233934560_e60d431ff7_b.jpg)

with good results wide open as expected

(https://c7.staticflickr.com/8/7773/18234175030_f2190a6c75_o.jpg)
Testing the Nikkor 105/2.5 P on FF (https://flic.kr/p/tMhUY7) by Arend (https://www.flickr.com/photos/vermazeren/), on Flickr

(https://c7.staticflickr.com/8/7747/17799236414_68e78de967_o.jpg)
Testing the Nikkor 105/2.5 P on FF (https://flic.kr/p/t7RJSs) by Arend (https://www.flickr.com/photos/vermazeren/), on Flickr
Title: Re: Nikkor 105mm f/2.5
Post by: Hugh_3170 on July 13, 2016, 10:19:17
Now that looks like a "kick ass" combination if ever there was............. ;D ;D ;D ;D ;D

Have fun!

More than 40 years separate the body and the lens. The latter being revamped to AI and equipped with a chip, thanks to the joint efforts of Bjørn and Erik  :):

............................

Title: Re: Nikkor 105mm f/2.5
Post by: MFloyd on July 13, 2016, 11:45:09
@ ArendV: is this not already the Schneider Xenotar inspired version (as mine) ? The pre-70 one being the Gauss-type Zeiss Sonnar
Title: Re: Nikkor 105mm f/2.5
Post by: ArendV on July 13, 2016, 12:12:06
@MFloyd, you are right that mine is the Xenotar inspired version like yours and launched by Nikon in 1971. But it is also often referred to as Gauss version (close to double Gauss design) and this may not be correct. Optical design specialists here on the forum will be able to confirm this.
http://www.nikkor.com/story/0005/ (http://www.nikkor.com/story/0005/)
The first version is the Sonnar which was launched in S-mount in 1953 and in a redesigned version for F-mount in 1959.
http://www.nikkor.com/story/0045/ (http://www.nikkor.com/story/0045/)

So question is if we can call our version Gauss or "Gauss like", Nikon does not refer to double Gauss in their story. But I don't think you can call the Sonnar a Gauss design.
Title: Re: Nikkor 105mm f/2.5
Post by: tdoan on July 13, 2016, 13:13:24
you should buy all 5 versions  :o :o :o!

1: tickmark
2: chrome nose sonnar version
3: new-nikkor
4: Ai
5: Ai-S

That's good! everything has a start

Of course I have to start at the bottom.  I picked up an Ai-S :D but as I am leaving on a trip tomorrow and won't be back until the end of next week, it will have to sit on a shelf at the local post office, waiting for me.  Poor babe.

This is the babe on a pedestal :) http://www.ebay.com/itm/Nikon-Nikkor-105mm-f2-5-Lens-for-Nikon-35mm-SLR-Cameras-/122018797628?nma=true&si=%252BJXXdKxdfFZwOaj%252FbS8HesIyQPk%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557

btw, you, Rick, are one of the absolute worst.  I keep reading your blog and having flashes of myself, branding my new Vessel, threatening the lenses "If you don't behave, I am going to take you apart and I know just how to do it ... I think.." :D Yes, me, the mad lens hacker :D

Quote from: Bjørn Rørslett
Nikon S-mount rangefinders
of course when master Bear speaks, I have no idea what he is talking about and have to google it :) Thank goodness for Google.

Quote from: tommiejeep
I'm in the same boat with 135mm lenses
Here they go again with the flauntings ... I am going to have to report you to the moderator :D  Truth be told, I had a 135 f2 on watch, debating between that and the 105 2.5

Quote from: richardHaw
i am looking for a cheap "mountain nikkor" for myself
::) aren't you there already ?  Me, I will just have to build one myself.  Been practicing this song to my wife "Just one more lens honey ..."  :P
Title: Re: Nikkor 105mm f/2.5
Post by: Jacques Pochoy on July 13, 2016, 13:24:35
Even the more "modern" Ai-s version is an incredible "convenient" lens... :-) Here musing with chairs at a café's terrace at f/5.6 !

(https://c7.staticflickr.com/2/1669/26098417142_57b789ce08_b.jpg)
Terrasse... (https://flic.kr/p/FLedam) by ArchiVue (https://www.flickr.com/photos/archivue/), sur Flickr with Df and 105mm f/2.5 AI-s
Title: Re: Nikkor 105mm f/2.5
Post by: Bjørn Rørslett on July 13, 2016, 14:00:39
The reference to the "mountain Nikkor" is to the 105 mm f/4 Nikkor-T that lived a very brief life around 1960. It was, as indicated by the "T" designation, a triplet optic that conferred a slim, lightweight barrel. The lens used tiny 34.5 mm filters and had a cute preset aperture ring in front and an even cuter little snap-on lens hood.

The name 'mountain' was fetched from the contemporary Mountain Elmar 90 mm f/4 for the Leica M-series. Such lenses were aimed at photographers wishing to travel light-weight.

As far as I recall, there were versions for the F and S mounts concurrently and they in fact only differed in their mounts, as the optics  are identical. Th

(https://nikongear.net/revival/proxy.php?request=http%3A%2F%2Fwww.destoutz.ch%2Fslides%2Flens_10.5cm_f4_405749.jpg&hash=aae0a9c6610e0cbb5352348158af3430b73db293)

I have a nice sample of the F-mount 105/4 T, with CPU of course ... Not a top performer by today's standards, but gets the job done discreetly. It can also do UV passably.  Must been 10-15 years ago I got it and it was not very expensive at that time. However, I refrained from getting the S version as asking prices were pretty high back then.

Briefly looked in my archives and found a few more recent images obtained with the 105/4 T. Here is one,

Title: Re: Nikkor 105mm f/2.5
Post by: richardHaw on July 13, 2016, 15:41:23
Hi, you can request for a tear-down guide if you need to. i have 3 versions of that lens in my notes :o :o :o

just make sure that you have the right tools and a steady hand and you're safe. watch professionals work in youtube as well, that will help a lot.
Title: Re: Nikkor 105mm f/2.5
Post by: Bjørn Rørslett on July 13, 2016, 15:44:59
The T-Nikkor is so simple there is no need for any disassembly and if required, I trust Erik does this with utmost ease. The CPU modification I managed myself.
Title: Re: Nikkor 105mm f/2.5
Post by: richardHaw on July 13, 2016, 15:57:27
i just want to open one just for the heck of it :o :o :o

the 105mm is my entry drug. i started with that lens, now i have 5 dryboxes full of stuff
Title: Re: Nikkor 105mm f/2.5
Post by: Akira on July 13, 2016, 16:00:36
The name 'mountain' was fetched from the contemporary Mountain Elmar 90 mm f/4 for the Leica M-series. Such lenses were aimed at photographers wishing to travel light-weight.

Small correction.  The Leica lens nicknamed "Mountaim Elmer" was actually an L-mount 105mm/f6.3 lens.  It was also of a Tessar type unlike the Triotar type on which Nikkor 105/4.0 design was based.
Title: Re: Nikkor 105mm f/2.5
Post by: Bjørn Rørslett on July 13, 2016, 16:24:59
Well, Leica-lore is obviously not my force. But the 'mountain' concept was of a small, light-weight lens longer than a normal one. Their outline would be somewhat similar. The T-Nikkor was "much" faster though, a whopping 1.3 stops ...
Title: Re: Nikkor 105mm f/2.5
Post by: richardHaw on July 13, 2016, 16:31:04
Of course I have to start at the bottom.

that is OK. the 105's are not rare at all unlike the 5.5cm which is starting to become even rarer even here in japan :o :o :o
Title: Re: Nikkor 105mm f/2.5
Post by: Akira on July 13, 2016, 16:55:02
Well, Leica-lore is obviously not my force. But the 'mountain' concept was of a small, light-weight lens longer than a normal one. Their outline would be somewhat similar. The T-Nikkor was "much" faster though, a whopping 1.3 stops ...

When the Mountain Elmar 105/6.3 was released in 1932, the 90/4.0 Elmar was housed in a fat lens barrel, unlike the later slim ones released in 1933.  Thus the "small and light-weight design" only applied to the 105/6.3 then.
Title: Re: Nikkor 105mm f/2.5
Post by: pluton on July 13, 2016, 20:08:44

 But I don't think you can call the Sonnar a Gauss design.
Correct.
The earlier design is the Sonnar-like one; the later design is the Gauss-like one.
Title: Re: Nikkor 105mm f/2.5
Post by: chris dees on July 13, 2016, 20:42:42
These are my 3 105's all in mint condition and working fine on my Df.

Nippon Kogaku Nikkor-P Auto 1:2.5 F=10.5cm Sonar from 1963
Nikkor-PC Auto 1:2.5 f=105mm AI-ed (Chipped by Eric) Gauss from 1973
Nippon Kogaku Nikkor-P Auto 1:2.5 f=105mm Sonar from 1971
Title: Re: Nikkor 105mm f/2.5
Post by: Roland Vink on July 13, 2016, 22:33:08
As far as I recall, there were versions for the F and S mounts concurrently and they in fact only differed in their mounts, as the optics  are identical.
Not only that, they also belong to the same serial number block, that is, Nikon made one set of serial number rings which were used for the F or S mount lenses.
During the rangefinder era Nikon often made lenses in multiple mounts - S, M39, Exacta, Contax - all belonging to the same serial number block. The Nikkor-T 10.5cm is the only example I know of where F and S mount lenses share the same serial numbers.
Title: Re: Nikkor 105mm f/2.5
Post by: ArendV on July 13, 2016, 23:48:16
Correct.
The earlier design is the Sonnar-like one; the later design is the Gauss-like one.

Thanks Pluton for confirming this !
Title: Re: Nikkor 105mm f/2.5
Post by: Airy on August 28, 2016, 23:02:20
The more I use it, the more I like it. Here another usage - shooting mosaics in the pretty dark church of Santa Maria Maggiore, Rome. Df, 12800 ISO, 1/125 handheld, wide open.
The keeper rate with such settings is near 100% on static subject : the Df + lens is heavy enough, and the "quiet" mode is also useful to keep vibration low.

At f/2.5, the lens is sharp and contrasty enough for the Df, at least when the subject is not too close. Here is an example (with 100% crop). Distance from subject may have been 10-15m.

Earlier I thought that f/2.5 was rather for slightly soft portraits, but no.
Title: Re: Nikkor 105mm f/2.5
Post by: Tristin on August 29, 2016, 00:23:49
The 105/2.5 gets better with distance.  It's shortcomings are really magnified at it's MFD.
Title: Re: Nikkor 105mm f/2.5
Post by: Akira on August 29, 2016, 03:40:13
The 105/2.5 gets better with distance.  It's shortcomings are really magnified at it's MFD.

Tristin, that is interesting.  My experiences with a couple of different versions of 105/2.5 (all were of Xenotar type.  Single-coated, multi-coated K, Ais) equally tell that they are sharper at MFD.  None I've had was satisfactory when focused at distant scenes.
Title: Re: Nikkor 105mm f/2.5
Post by: richardHaw on August 29, 2016, 04:52:02
some people say that a 100X multiplication factor of FL = distance is the optimum distance for a lens :o :o :o

example:

50mm = 5 meters
85mm = 8.5 meters
Title: Re: Nikkor 105mm f/2.5
Post by: Tristin on August 29, 2016, 06:33:13
Akira, I particularly mean the lense's field curvature and chromatic aberrations which are much more noticeable up close.  The sharpness of the 105/2.5 is good up close, but the area in which the field curvature will allow sharpness plunges strongly in the corners and brings increased CA with it making the image corners and borders look poor.  At farther distances the field curvature effects the image less prominently.
Title: Re: Nikkor 105mm f/2.5
Post by: Akira on August 29, 2016, 06:48:09
Akira, I particularly mean the lense's field curvature and chromatic aberrations which are much more noticeable up close.  The sharpness of the 105/2.5 is good up close, but the area in which the field curvature will allow sharpness plunges strongly in the corners and brings increased CA with it making the image corners and borders look poor.  At farther distances the field curvature effects the image less prominently.

I see.   I guess the lens designers thought the mid-teles would be used for the portraits more often than something flat in the entire frame when focused closer.  So, the field curvature could be a bit tolerated.
Title: Re: Nikkor 105mm f/2.5
Post by: Akira on August 29, 2016, 06:50:19
some people say that a 100X multiplication factor of FL = distance is the optimum distance for a lens :o :o :o

example:

50mm = 5 meters
85mm = 8.5 meters

I think the lenses without CRC at that time was basically designed for the infinity focus except for Micro Nikkors.  But the balancing of the aberrations in different distances should have been dependent on the designers' taste.
Title: Re: Nikkor 105mm f/2.5
Post by: Tristin on August 29, 2016, 07:44:15
I see.   I guess the lens designers thought the mid-teles would be used for the portraits more often than something flat in the entire frame when focused closer.  So, the field curvature could be a bit tolerated.

Precisely.
Title: Re: Nikkor 105mm f/2.5
Post by: simsurace on August 29, 2016, 12:50:27
some people say that a 100X multiplication factor of FL = distance is the optimum distance for a lens :o :o :o

example:

50mm = 5 meters
85mm = 8.5 meters

Do these people also explain why they think so?
Title: Re: Nikkor 105mm f/2.5
Post by: Akira on August 29, 2016, 12:55:19
some people say that a 100X multiplication factor of FL = distance is the optimum distance for a lens :o :o :o

example:

50mm = 5 meters
85mm = 8.5 meters

Are the "some people" the folks gathering at tokinon 50/1,4?  ;)
Title: Re: Nikkor 105mm f/2.5
Post by: richardHaw on August 30, 2016, 07:12:34
Are the "some people" the folks gathering at tokinon 50/1,4?  ;)
no, i think it was Sato Haruo himself who said that. :o :o :o
read the 5cm or the 5.8cm write up i think it's there
Title: Re: Nikkor 105mm f/2.5
Post by: richardHaw on August 30, 2016, 07:13:18
Do these people also explain why they think so?

I don't recall but I read it from a credible source. I just cannot remember where :o :o :o
Title: Re: Nikkor 105mm f/2.5
Post by: Akira on August 30, 2016, 07:40:30
no, i think it was Sato Haruo himself who said that. :o :o :o
read the 5cm or the 5.8cm write up i think it's there

Just checked "1001 Nights".  I couldn't find any of the notion at least in the sections for 58/1.4, 55/1.2, 50/1.4 or the rangefinder 50/2.0.  I'll look into other sections when I have time.
Title: Re: Nikkor 105mm f/2.5
Post by: richardHaw on August 30, 2016, 07:42:13
Just checked "1001 Nights".  I couldn't find any of the notion at least in the sections for 58/1.4, 55/1.2, 50/1.4 or the rangefinder 50/2.0.  I'll look into other sections when I have time.

me,too :o :o :o
Title: Re: Nikkor 105mm f/2.5
Post by: Akira on August 30, 2016, 07:53:09
me,too :o :o :o

 ;D ;D ;D
Title: Re: Nikkor 105mm f/2.5
Post by: stenrasmussen on September 07, 2016, 09:35:45
Ai-S version at f/2.5.
Title: Re: Nikkor 105mm f/2.5
Post by: chris dees on September 07, 2016, 13:29:54
Nikkor-PC 105/2.5 AI-d
Title: Re: Nikkor 105mm f/2.5
Post by: David H. Hartman on September 07, 2016, 21:56:23
The slight softness of the 105/2.5 Xenotar-type at close focus and wide apertures (both together) is a feature not a fault. This is explained in tale No. 5 of Nikkor - The Thousand and One Nights. The 105/2.5 is often used for portraits and smooth bokeh was more important to the designer at say two meters.  For sharp photo in close stop down to f5.6 or select a 105/4.0 or 105/2.8 Micro-Nikkor among others. Some complain the bokeh of the 105/2.5 isn't as good stopped down. That is the nature of the lens.

David Ruether notes this soft wide open and close distance (both together) in his subjective evaluations, also 85/2.0 and 135/2.8 (compact versions). Here's a link...

http://www.david-ruether-photography.com/slemn.html

I tested three 105/2.5 Xenotar-types and noted they achieved their sweet spot a bit later than some other prime Nikkors at two meters. Tale No. 5 explained my observations.

Dave
Title: Re: Nikkor 105mm f/2.5
Post by: Roland Vink on September 08, 2016, 02:52:09
1001 nights said similar about the AI 135/2 also. See:  http://www.nikkor.com/story/0030/

"The Ernostar type, which features a highly asymmetrical lens configuration, is likely to cause more significant fluctuating aberrations compared to the Gauss-type, which features a symmetrical lens configuration.

However, this lens makes good use of the characteristics; it provides sharp images in the long-range shots and leaves spherical aberration and coma in the short-range photos, thereby representing the smoothly melted edges of out-of-focus images. "


It might be worth noting the Xenotar 105/2.5, having a relatively symmetrical design, can focus closer and performs better at close range than the older Sonnar version.
Title: Re: Nikkor 105mm f/2.5
Post by: Airy on September 08, 2016, 06:30:46
Concurs with my observations. However, at short range for portraits, I would seldom use the full aperture, too much of the face being too obviously blurred, so there is no "problem" for me using the 105/2.5. f/5.6 is often my chosen setting for headshots, no matter the FL, at least if the background is not overly disturbing.

I also reported here, earlier, that (for instance) the old Tamron 90/2.5 was definitely the better lens at 1.0-1.5m distances in terms of sharpness wide open, and LoCA. However the Nikkor definitely has the best background blur under such circumstance. No wonder the Tamron does its job as a (primarily) macro lens...
Title: Re: Nikkor 105mm f/2.5
Post by: Hugh_3170 on September 08, 2016, 09:34:27
NG contributor Mongo has very recently put his Tamron 90mm f/2.5 to good use here:  http://nikongear.net/revival/index.php/topic,4287.0/topicseen.html

I have observed similar performance from my uncle's Tamron 90mm on his Pentax bodies.


Concurs with my observations. However, at short range for portraits, I would seldom use the full aperture, too much of the face being too obviously blurred, so there is no "problem" for me using the 105/2.5. f/5.6 is often my chosen setting for headshots, no matter the FL, at least if the background is not overly disturbing.

I also reported here, earlier, that (for instance) the old Tamron 90/2.5 was definitely the better lens at 1.0-1.5m distances in terms of sharpness wide open, and LoCA. However the Nikkor definitely has the best background blur under such circumstance. No wonder the Tamron does its job as a (primarily) macro lens...
Title: Re: Nikkor 105mm f/2.5
Post by: Airy on September 08, 2016, 12:24:27
Indeed. I am nevertheless pleased to use the Tamron, as I did today (more macro shoots). Still OK for general photography but a bit dull.

I can tolerate some *slight* lack of sharpness on portraits, but I would not describe it as a desirable feature, let alone a design goal. Everybody is pleased to get skin blemishes removed, but photoshop (in the right hands) does a better job than "bad" lenses here. Also, while attenuating skin defects is OK, transforming eye lashes into mush does not work for me. And removing the sparkle in the pupils even less. So 105/2.5 yes, because it is definitely good enough, but Zeiss 135/2 APO remains a good choice...
Title: Re: Nikkor 105mm f/2.5
Post by: MFloyd on September 10, 2016, 13:47:28
This morning, my English Bulldog taking a nap in a ray of sun.

(https://farm9.staticflickr.com/8599/29581487735_9dec63ac23_k.jpg)
Nikkor-P 105mm f/2.5 transformed and chipped by Erik L and Bjørn R.