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Please help to identify a very interesting lens
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PostPosted: Thu Aug 11, 2016 6:32 pm    Post subject: Please help to identify a very interesting lens Reply with quote
Hello to everyone! Could anyone help me to identify a very interesting lens, what I bought a few days ago.

Last edited by olesia2015 on Tue Aug 30, 2016 7:09 am; edited 2 times in total


PostPosted: Thu Aug 11, 2016 6:43 pm    Post subject: Reply with quote
Any opinions?


PostPosted: Thu Aug 11, 2016 7:39 pm    Post subject: Reply with quote
lens for a most likely military night vision system


PostPosted: Thu Aug 11, 2016 7:56 pm    Post subject: Reply with quote
kds315* wrote:
lens for a most likely military night vision system


Interesting opinion, but I have a doubts about it: first of all the size of the lens is to small, second - the focal flange distance of the lens is about 30mm. But I will try to make a test shot with it on my A7II - to see how it sensitive to ir spectre.


PostPosted: Thu Aug 11, 2016 9:15 pm    Post subject: Reply with quote
Isn't it a cine lens for some small format? The teeth in the focus ring are typical of cine lenses. The appendix in the diaphragm could be an ND filter for reducing light intensity without closing the aperture too much and so incurring diffraction problems. This trick was also used in the Canon VL video lenses for Hi-8 cameras.


PostPosted: Fri Aug 12, 2016 3:03 am    Post subject: Reply with quote
Gerald wrote:
Isn't it a cine lens for some small format? The teeth in the focus ring are typical of cine lenses. The appendix in the diaphragm could be an ND filter for reducing light intensity without closing the aperture too much and so incurring diffraction problems. This trick was also used in the Canon VL video lenses for Hi-8x cameras.


Well, that's will be awesome and that's what I'm hoping about this lens)

Last edited by olesia2015 on Tue Aug 30, 2016 7:09 am; edited 1 time in total


PostPosted: Fri Aug 12, 2016 4:12 am    Post subject: Reply with quote
well....

Last edited by olesia2015 on Tue Aug 30, 2016 7:10 am; edited 2 times in total


PostPosted: Fri Aug 12, 2016 6:01 am    Post subject: Reply with quote
Excactly what I expected form a night vision lens Wink Wink Wink


PostPosted: Fri Aug 12, 2016 7:22 am    Post subject: Reply with quote
kds315* wrote:
Excactly what I expected form a night vision lens Wink Wink Wink


Could you be more specific please?
According to the my knowledges about the night vision lenses - all of them have much longer focal flange distance (so its easily to use it on DSLR) and with color shots showing strong discoloration with huge chromatic aberrations, due to the extreme sensitivity in IR specter. With this lens colors looks natural, there is no extreme aberrations and focal flange distance is pretty small (good only for mirrorless and rangefinder cameras).
Besides, as far as I know, all of the night vision lenses have pretty long focal length, cause they are made for using from the big distance obviously.


PostPosted: Fri Aug 12, 2016 4:42 pm    Post subject: Reply with quote
NV lenses come with all focal lengths and flange distances so you can't judge by those factors.

The results remind me of the JML 56mm lens that is often seen in a shutter, it was used with oscilloscope cameras. Isn't fully corrected for visible wavelengths, hence the poor performance.


PostPosted: Fri Aug 12, 2016 11:23 pm    Post subject: Reply with quote
I'm quite sure it's lens for Tank night vision system like TVN-2 (ТВН-2).
I have a lens with such diaphragm, that came from TVN-2.
http://pierretizien-photos.blogspot.fr/p/inconnu.html
There are other night vision systems. According to you nickname, it looks like you are russian speaker(from ua?), so I can suggest you to check this link for more informations : http://warfiles.ru/show-33400-otechestvennye-tankovye-pribory-strelby-i-nablyudeniya.html

This is not cine lens.


PostPosted: Sat Aug 13, 2016 4:06 am    Post subject: Reply with quote
BurstMox wrote:
I'm quite sure it's lens for Tank night vision system like TVN-2 (ТВН-2).
I have a lens with such diaphragm, that came from TVN-2.
http://pierretizien-photos.blogspot.fr/p/inconnu.html
There are other night vision systems. According to you nickname, it looks like you are russian speaker(from ua?), so I can suggest you to check this link for more informations : http://warfiles.ru/show-33400-otechestvennye-tankovye-pribory-strelby-i-nablyudeniya.html

This is not cine lens.


Thank you so much for your reply and all information, that you provided!
Now I see, that it really seems to be a tank lens...Well, I think I still make a try to place it inside of the helicoid and make some more pictures, maybe it have some art potential)

Спасибо за помощь! Wink


PostPosted: Sat Aug 13, 2016 10:29 am    Post subject: Reply with quote
You're welcome!
Some tank NV lens are interesting, others not.
I have 4 different ones, 3 give not really interesting results, but one is really impressiv (eq 50/1.5).

Незачто)
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