a bargain ;-) on ebay__ 20 x Nikkor O 55mm CRT-lenses

typestar · Post by **typestar** » Mon Apr 22, 2013 12:08 pm

in case: For all of you, who have to less lenses at home, here a real bargain...:

http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... ink:top:en

regards,
christian

ray_parkhurst · Post by **ray_parkhurst** » Tue Apr 23, 2013 6:40 pm

Really neat lot of lenses. I think these are optimized for 1:5 magnification to image the old 6" diameter CRT oscilloscopes. Has anyone here tested one of these to see how well it performs in other uses? Not that I'm considering buying them, just curious...

rovebeetle · Post by **rovebeetle** » Tue Apr 23, 2013 10:15 pm

At least Bjørn Rørslett highly praises this lens - when used within its design magnification range.
Cheers

ChrisR · Post by **ChrisR** » Wed Apr 24, 2013 1:00 am

JML made an apparently "similar" lens, many of which have been on ebay with an electronic shutter, at about fifty bucks for years.
Fun to play with for the aperture, a noticeably curved field to suit a CRT, but not excitingly sharp.

dickb · Post by **dickb** » Thu May 09, 2013 1:20 am

ChrisR wrote:JML made an apparently "similar" lens, many of which have been on ebay with an electronic shutter, at about fifty bucks for years.
Fun to play with for the aperture, a noticeably curved field to suit a CRT, but not excitingly sharp.

JML made 2 different 56mm f/1.2 lenses, as far as I know. One is the one you mention in an electronic shutter,(with larger front and rear elements than the Nikon), the other is an almost exact copy of the Nikkor-O, with M39 mount.

I own the Nikkor-O lens and enjoy using it very much, it gives an extremely shallow DOF I like with a very nice contrast between the very sharp focussed subject and the wallowing OOF rendition.

The electronic shutter version may also be fun to play with, but its apparent lack of sharpness says nothing about the M39 mount lenses.

dickb · Post by **dickb** » Thu May 09, 2013 2:15 am

ChrisR wrote:JML made an apparently "similar" lens, many of which have been on ebay with an electronic shutter, at about fifty bucks for years.
Fun to play with for the aperture, a noticeably curved field to suit a CRT, but not excitingly sharp.

JML made 2 different 56mm f/1.2 lenses, as far as I know. One is the one you mention in an electronic shutter,(with larger front and rear elements than the Nikon), the other is an almost exact copy of the Nikkor-O, with M39 mount.

I own the Nikkor-O lens and enjoy using it very much, it gives an extremely shallow DOF I like with a very nice contrast between the very sharp focussed subject and the wallowing OOF rendition.

The electronic shutter version may also be fun to play with, but its apparent lack of sharpness says nothing about the M39 mount lenses.

Craig Gerard · Post by **Craig Gerard** » Thu May 09, 2013 2:26 am

Harry wrote:At least Bjørn Rørslett highly praises this lens - when used within its design magnification range.
Cheers

Harry,
Do you have a link.....something to explore further?

I found this information:

This very rare speciality lens was made for industrial use to record faint cathode-screen traces and came with a long Leica-thread mount. It can be mounted on any Nikon camera with the LF adapter and a restricted focusing range is achieved by rotating it in the adapter. It is optimised for the limited magnification range 1:4.4-1:5.5 only and here it delivers exceptionally sharp images. Peak performance is between f/1.4 and f/4 so the lens is extremely useful for hand-held close-ups. Its quality for flower photography is further enhanced by a negative field curvature thus enabling both central and outer floral areas to be in sharp focus even at wide aperture settings.
Be aware that using this lens way outside its optimum magnification range will induce severe spherical aberration, flare, and changes in field curvature. All these alterations may or may not be desirable for a given task.

Reference: http://www.naturfotograf.com/lens_spec.html

dickb wrote:I own the Nikkor-O lens and enjoy using it very much, it gives an extremely shallow DOF I like with a very nice contrast between the very sharp focussed subject and the wallowing OOF rendition.

Can you point to some samples?

I have what appears to be half of a JML 56 f/1.2 and an adapter, not quite sure what happened to the other half. It's probably time I pointed it at something to see what happens.

Craig

dickb · Post by **dickb** » Thu May 09, 2013 4:57 pm

Craig Gerard wrote:
dickb wrote:I own the Nikkor-O lens and enjoy using it very much, it gives an extremely shallow DOF I like with a very nice contrast between the very sharp focussed subject and the wallowing OOF rendition.
Can you point to some samples?

https://picasaweb.google.com/dickbphoto ... 1786133698

https://picasaweb.google.com/dickbphoto ... 7273322802

These were taken in combination with a Canon 5D mkII.