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20mm f/0.5 GOI CV-catadioptric
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PostPosted: Fri May 09, 2008 6:53 pm    Post subject: 20mm f/0.5 GOI CV-catadioptric Reply with quote

Just came across this by accident, its quite amazing. A mirror lens, 20mm, and f/0.5 !! Also it was designed in 1948 ...

http://www.ussrphoto.com/Wiki/default.asp?ImageID=1976&ParentID=2&WikiCatID=28&ContentID=541





PostPosted: Fri May 09, 2008 7:52 pm    Post subject: Reply with quote

Absolutely amazing , Carl Zeiss people say to them secrets Smile


PostPosted: Fri May 09, 2008 7:57 pm    Post subject: Reply with quote

The secrets have already been revealed since quite some time. Marco Cavina, my friend, got the info from me about these lens(es).


PostPosted: Fri May 09, 2008 8:11 pm    Post subject: Reply with quote

So, when are you getting one ? Smile


PostPosted: Fri May 09, 2008 8:31 pm    Post subject: Reply with quote

If I ever run across one... Wink


PostPosted: Fri May 09, 2008 9:00 pm    Post subject: Reply with quote

According to the web page, the image circle on this thing is tiny - 2.9mm

That would require a very small very dense sensor, smaller even than that of a camera-phone.

I wonder what they used these things for ?


PostPosted: Fri May 09, 2008 9:24 pm    Post subject: Reply with quote

I would assume that was for chipmaking. The small image circle and the f0.50 (very high NA) speaks for that.


PostPosted: Fri May 09, 2008 9:41 pm    Post subject: Reply with quote

Not for chip-making in 1948.

I spoke about a sensor looking at how one would use it now, but back then it would have been a similarly tiny bit of film.

Maybe it was for a genuinely spy-ish application like working with micro-dots.


PostPosted: Sun May 11, 2008 9:01 am    Post subject: Reply with quote

luisalegria wrote:
Not for chip-making in 1948.

I spoke about a sensor looking at how one would use it now, but back then it would have been a similarly tiny bit of film.

Maybe it was for a genuinely spy-ish application like working with micro-dots.


maybe it was used in an 'attempt' to creating chips Very Happy