Vintage DSLR forum

What can you do when it is cold outside and you're free? Just play a bit with strange optics: here one of the world's fastest lenses ever build on my Nikon D1.

This lens was made for X-ray devices; there are versions with focal lengths of 65 mm and 150 mm., all with a maximum aperture of f/0.75. Optical formula is 7 elements in 4 groups, no aperture and fix-focus. For close-ups interesting, as you may see below.


Regards,
Nico

http://www.nicovandijk.net

Hi Nico,
How did you mount it? Is it F mount?

Kiu

Hi Kiu, I used a BR-2 ring with a rubber clamp. I am still working on a serious mount. I need a (step up/down) ring with 80mm. thread. DOF is almost non-existing and infinity isn't possible when mounted on a SLR. Maybe I'll convert an old Coolpix. The difference between the Rayxar and the f/1.2 - Nikkors is just 1.5 stop...........and 400 gram!
Regards,
Nico

www.nicovandijk.net

As the working distance is extremely short I've removed the rear lens group (2 elements) and replaced it by a Nikon eyepiece correction lens (+1) in order to increase the exit pupil (aka Ramsden disc) and working distance, which is 50 cm. now. See below the results. I am going to try to use other lenses to obtain infinity.

(German Black Wood 'Rauchermännchen')
Regards,
Nico

http://www.nicovandijk.net

The difference between the Rayxar and the f/1.2 - Nikkors is just 1.5 stop...........and 400 gram!

Let's not forget the ever important focus ring and aperture control...




Kiu