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Nikon 105mm f/2.5 Ai on D700
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PostPosted: Tue Aug 27, 2013 3:50 am    Post subject: Reply with quote
iangreenhalgh1 wrote:
Instead of all these words, we need pictures. Information on details is all fine and well, but we need to see image samples from the different versions to be able to draw any meaningful conclusions.

I have to wonder, do these people who are full of words but never post a single picture actually shoot? Do they actually know what they're talking about? Without any image evidence, I think they are best ignored to be honest, all they do is ruin threads with endless words that are bereft of meaning due to no evidence they even know how to use a camera. It is most annoying, I call them armchair photographers and like back seat drivers, they are more of a hindrance than a help.


"Picturess? We don't need no pictures! I don't have to show you any stinkin' pictures!"


PostPosted: Tue Aug 27, 2013 11:05 am    Post subject: Reply with quote
iangreenhalgh1 wrote:
Instead of all these words, we need pictures. Information on details is all fine and well, but we need to see image samples from the different versions to be able to draw any meaningful conclusions.


If you need pictures why don't you go and look at some. There's a big user group for the lens, with thousands of pictures, on Flickr.

Quote:
I have to wonder, do these people who are full of words but never post a single picture actually shoot? Do they actually know what they're talking about? Without any image evidence, I think they are best ignored to be honest, all they do is ruin threads with endless words that are bereft of meaning due to no evidence they even know how to use a camera. It is most annoying, I call them armchair photographers and like back seat drivers, they are more of a hindrance than a help.


Why don't you tell us who these people are ? Name names. There's no need to be coy - we're all grown ups - aren't we ? If you don't want to do it here, then open a new thread on one of restricted parts of the Forum.


PostPosted: Wed Aug 28, 2013 12:26 am    Post subject: Reply with quote


This one is unique. $42, was missing the rear element. So I bought a couple of loose optics off of Surplus Shack, used a 103mm single-element optic to substitute for the original. Set the spacing between groups to maintain RF coupling across the full focus range. Turns out the rear fixture of a Jupiter-3 fits the Nikon barrel. It's still a Sonnar, just a little different from every other one ever made. I have the regular production lens in S-Mount, Contax mount, Leica Mount, F-Mount in "CM" and Pat Pend, Sonnar version F-Mount, Double Gauss multicoated, and Ai. All of the versions are good, including the Surplus-Shack version.

Wide-Open on the Leica M9.



PostPosted: Thu Aug 29, 2013 4:22 am    Post subject: Reply with quote
Cheers Brian, that's very interesting. I have a LOMO OKC8-35-1 2/35 lens with a ruined rear element, so I think I'll have to try the Surplus Shed replacement trick.


PostPosted: Thu Aug 29, 2013 9:50 am    Post subject: Reply with quote
I took apart a number of Sonnar formula lenses, from 50mm through to 135mm. What I found: the front element and middle group forms a Telephoto lens with focal length "around" 2.5x that of the focal length of the assembled lens. The rear group (or single-element in the case of the 10.5cm) is about the same focal length of the complete lens. Set the spacing between front and rear section to produce the effective focal length of the complete lens.

So if you can measure the focal length of the rear element- replace with one of the same type, Plano-Convex for the Nikkor. If you change the shape, can usually get a center-sharp lens that has some interesting aberrations at the edge. For an SLR- Even if you hit it close, will work well. I made a working Sonnar out of a Canon 50/1.5 from and rear triplet from a Nikkor 5cm F1.4. Also made a lens out of the front section of a Jupiter-8 and rear section from a Retina Xenon, center-sharp and interesting aberrations.


PostPosted: Thu Aug 29, 2013 11:49 am    Post subject: Reply with quote
That's good info Brian, cheers. The OKC8-35-1 is a Planar type, the rear element is a meniscus so I should be able to find a replacement.



The diameter of the rear element is 18.9mm according to this literature:

http://www.geocities.ws/kinor35/lenses/lenses-prime/035-oks-8-35-1.htm


PostPosted: Thu Aug 29, 2013 9:09 pm    Post subject: Reply with quote
iangreenhalgh1 wrote:
That's good info Brian, cheers. The OKC8-35-1 is a Planar type, the rear element is a meniscus so I should be able to find a replacement.





Is not the rear element biconvex ?


PostPosted: Mon Sep 02, 2013 3:09 am    Post subject: Reply with quote
Not quite getting what the problem is with the K lens designation. K lenses were not AI. They may have been converted to AI, but they were not originally AI.

But no matter what the designation, the 105 is a great little lens, in K, Ai or Ai-S form. Here's an Ai-S:



Larger sizes: http://www.flickr.com/photos/gaeger2/8654892841/lightbox/
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