Author Topic: Nikkor 105mm f/2.5  (Read 24398 times)

Tristin

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Re: Nikkor 105mm f/2.5
« Reply #45 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.
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Akira

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Re: Nikkor 105mm f/2.5
« Reply #46 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.
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richardHaw

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Re: Nikkor 105mm f/2.5
« Reply #47 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

Tristin

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Re: Nikkor 105mm f/2.5
« Reply #48 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.
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Akira

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Re: Nikkor 105mm f/2.5
« Reply #49 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.
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Akira

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Re: Nikkor 105mm f/2.5
« Reply #50 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.
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Tristin

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Re: Nikkor 105mm f/2.5
« Reply #51 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.
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simsurace

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Re: Nikkor 105mm f/2.5
« Reply #52 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?
Simone Carlo Surace
suracephoto.com

Akira

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Re: Nikkor 105mm f/2.5
« Reply #53 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?  ;)
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richardHaw

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Re: Nikkor 105mm f/2.5
« Reply #54 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

richardHaw

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Re: Nikkor 105mm f/2.5
« Reply #55 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

Akira

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Re: Nikkor 105mm f/2.5
« Reply #56 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.
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richardHaw

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Re: Nikkor 105mm f/2.5
« Reply #57 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

Akira

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Re: Nikkor 105mm f/2.5
« Reply #58 on: August 30, 2016, 07:53:09 »
"The eye is blind if the mind is absent." - Confucius

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stenrasmussen

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Re: Nikkor 105mm f/2.5
« Reply #59 on: September 07, 2016, 09:35:45 »
Ai-S version at f/2.5.