NikonGear'23

Gear Talk => What the Nerds Do => Topic started by: Erik Lund on March 05, 2016, 11:01:55

Title: Nikkor 10.5mm f/2.8 - 62mm filter threads modified
Post by: Erik Lund on March 05, 2016, 11:01:55
I am starting to prepare for the Scotland NikonGear Workshop and in this connection I wanted to work on Nikkor 10.5mm f/2.8 adding 62mm filter threads, to give the possibility to make the usual FX hack more flexible and the added benefit of using a standard 62mm lens cap.

Now it is the usual 'almost' circular fisheye after the 'hack' cutting off the petal lens hood ;)

By adding 62mm 'filter rings' the lens becomes a circular fisheye by cropping,,, naturally.

The donor was a Close up nr. 6T filter housing relieved from the glass and the male 62mm threads are used as a spacer inside to make the filter slide on to the lens and position, seat correctly.

A bit of Dremel work,,, and the filter ring slides into position solidly.


Title: Re: Nikkor 10.5mm f/2.8 - 62mm filter threads modified
Post by: Bjørn Rørslett on March 05, 2016, 11:10:08
An interesting twist. The "shaved" 10.5 mm has a front lens highly susceptible to knocks and bumps besides being a magnet for finger prints. I assume the filter "holder" can slide back and forth?
Title: Re: Nikkor 10.5mm f/2.8 - 62mm filter threads modified
Post by: Erik Lund on March 05, 2016, 11:25:23
The filter threads are fixed on this modification so extension rings are needed, it is set not to vignette even at infinity.

It would be possible to make it slide for instance with a tight fit and felt ;)

Title: Re: Nikkor 10.5mm f/2.8 - 62mm filter threads modified
Post by: Bjørn Rørslett on March 05, 2016, 11:27:39
Aha, the K-ring set comes to the rescue - yet again ....
Title: Re: Nikkor 10.5mm f/2.8 - 62mm filter threads modified
Post by: Frank Fremerey on March 05, 2016, 11:30:08
The D810 looks like new *ggg*

Great work!
Title: Re: Nikkor 10.5mm f/2.8 - 62mm filter threads modified
Post by: Erik Lund on March 05, 2016, 11:35:33
Thanks ;)

Yes 'K-Rings' but 62mm ones!
Title: Re: Nikkor 10.5mm f/2.8 - 62mm filter threads modified
Post by: Bjørn Rørslett on March 05, 2016, 12:01:13
sorry - I overlooked that size is expanded from the usual 52 mm.
Title: Re: Nikkor 10.5mm f/2.8 - 62mm filter threads modified
Post by: Akira on March 05, 2016, 12:53:01
Amazing job, as always, Erik!

So, you would need some stacked filter rings without the glasses to use a cap?
Title: Re: Nikkor 10.5mm f/2.8 - 62mm filter threads modified
Post by: Erik Lund on March 05, 2016, 13:17:34
Thanks!

Yes, a couple of filter rings to avoid the lens cap touches the glass front!

Or now I use an old Nikon 62mm 'glass-less' CPL it has 72mm front filter threads :)

Especially for these Fisheye and ultra wides this I mandatory! Otherwise specs will show up in the images.

I'm in the final process of negotiating with Photografica.dk to rent their 6mm f/2.8 for the Scotland Workshop ;)

So I'm also looking into collecting all the bits and pieces for my off center tripod to balance it on, without the feet showing up in all the pictures,,, ;)

Title: Re: Nikkor 10.5mm f/2.8 - 62mm filter threads modified
Post by: Bjørn Rørslett on March 05, 2016, 13:56:24
Does that might Fish 6/2.8 come with its own truck and dedicated driver ??? :D

I have seen this massive lens three times now: Tokyo, London, and Copenhagen. Never taken a picture through it though. Yet.
Title: Re: Nikkor 10.5mm f/2.8 - 62mm filter threads modified
Post by: Erik Lund on March 05, 2016, 14:37:25
It's 5 kg or 10 Lb so yes it's appropriate we have rented a big car ;)

I'm sure your up to the task of shooting it - I'm just facilitating that the lens will appear in the Scotish landscape ;)

For sure we need to do a star sky shot amongst many others!

Now I'll shoot away with the tiny 10.5mm to get re-accustomed to the unique Fisheye perspective ;)
Title: Re: Nikkor 10.5mm f/2.8 - 62mm filter threads modified
Post by: Erik Lund on March 05, 2016, 19:22:51
BTW; The original petal lens hood that is cut off can after the modification be refitted again whenever DX shooting is needed, the petal lens hood fits inside the 62mm filter threads or in a separate filter ring- Quite neat IMHO
Title: Re: Nikkor 10.5mm f/2.8 - 62mm filter threads modified
Post by: Erik Lund on March 05, 2016, 19:53:11
Here it is;

(https://farm2.staticflickr.com/1633/24902585294_06fe592f0c_h.jpg) (https://flic.kr/p/DWyg1S)NIKKOR 10.5mm re use hood (https://flic.kr/p/DWyg1S) by Erik Gunst Lund (https://www.flickr.com/photos/erik_lund/), on Flickr

If mounted in a filter ring trimming of the ring is needed,,,
Title: Re: Nikkor 10.5mm f/2.8 - 62mm filter threads modified
Post by: Jakov Minić on March 05, 2016, 19:53:52
I can hardly wait to go fish-eyeing in Scotland!
Title: Re: Nikkor 10.5mm f/2.8 - 62mm filter threads modified
Post by: helioer on March 15, 2016, 10:27:14
Looks nice. I've been thinking about the shave as well for my 10.5, but now it is almost unnecessary since I've once again added more gear and now my "fishy" alternatives are
- Sigma 8/3.5 AF
- Samyang 8/3.5 MF
- Nikkor 10.5/2.8G
- Nikkor 16/2.8 AF D

MF works well with Fish...

I have my old signature still, but have to update that due to changes in my gear - probably need to remove the gear list as I tend to add more stuff instead of selling it...

New stuff
- the Samyang mentioned above
- Nikkor 24/1.4G - cheap second hand, no signs of wear
- D800 body - second hand and cheap - was looking for a used D3x and found it, but the same shop had the D800 a lot cheaper

Additionally some non-Nikon stuff
- Wacom Intuos Pro tablet (had to take the small version as it was the only size I could fit to my desk)
- Adobe Photoshop CC and Lightroom CC included with the Wacom deal
- old cameras I used to own but sold away - found dirt cheap ones - Canon FTb (bought one in 1970 - bought one now as a working sample with 50/1.8 lens for 70 euros), Canon A-1 (sold mine when bought my first Canon F-1n - paid only 5 euros for the "new sample", inserted a battery and it works), one Yashica 4x4 gray (found almost unused one at my wife's relatives - they know I love gear, so got it), one Kodak Brownie C (have used this type in the 60's), had my old F-1n cleaned + motor drive battery replaced (bought the camera + motor drive second hand in 1985 and used it as my main SLR until 2003 before switching to Nikon), bought a second F-1n as well a couple of weeks ago
- one Lytro Illum - cheap, second hand, remains to be seen will it be a display cabinet piece or something to be used. Funny issue though that the Lytro software is not comptible with my Nvidia Quadro
- writing this on my new iPad Air 2

Serious GAS/NAS but

I actually started my own company about one month ago. I can retire in two years and I needed a "hobby" for retirement time. I added all my interests to the business description so I'll get sales tax away from purchases like photo gear...
Title: Re: Nikkor 10.5mm f/2.8 - 62mm filter threads modified
Post by: Erik Lund on July 06, 2016, 09:43:46
Here is a quick shot, composite of two images with the 10.5mm, one in vertical and one in portrait direction.

A gimbal head can be used for this type of shot to avoid misalignment.

(https://c7.staticflickr.com/2/1703/25959258726_c4aca2dd26_h.jpg) (https://flic.kr/p/FxVZdj)Rotunde10_5_2 (https://flic.kr/p/FxVZdj) by Erik Gunst Lund (https://www.flickr.com/photos/erik_lund/), on Flickr
Title: Re: Nikkor 10.5mm f/2.8 - 62mm filter threads modified
Post by: Kim Pilegaard on July 06, 2016, 10:49:51
Erik,

Great result!

A bit of explanation would help. Why did you take the two images in different orientations? Why not just two vertical ones? How do do you handle the alignment? How did you do the stitching? Is the "shaved" version of the 10.5 mm needed for this task?
Title: Re: Nikkor 10.5mm f/2.8 - 62mm filter threads modified
Post by: Jakov Minić on July 06, 2016, 11:10:16
Erik is an expert in using fish-eye lenses :)

Kim, I may perhaps answer your first question.
When you shoot the 10.5 in landscape mode, the top and bottom part of the photo is not fully round, parts are missing.
So you rotate the camera and lens 90 degrees to fill in the blanks in order to get a full circular image.
Title: Re: Nikkor 10.5mm f/2.8 - 62mm filter threads modified
Post by: Kim Pilegaard on July 06, 2016, 11:45:44
Thanks Jakov!

I think I am understanding it now. So even with the shaved version, parts of the full circle is cut off. The landscape and the portrait pictures supplement each other, provided the two pictures are centred at the same point?
Title: Re: Nikkor 10.5mm f/2.8 - 62mm filter threads modified
Post by: Erik Lund on July 06, 2016, 12:10:54
Yes, that is it. Thanks Jakov ;)

And yes cantered along the optical axis

The 10.5 is designed as a 'Full frame' Fisheye on DX it just turns out that when rotating it 90 degrees you get the full circle, the two missing top and bottom bits of the image.

The advantage is that you can use a much larger area of an FX sensor than an 8mm Circular Fisheye lens on FX, this gives you much more 'pixels in use' so to say and the 10.5mm is a remarkably sharp performer!