Minolta F.ROKKOR-QF 1:5.6 f=200mm

[radeks]

Hi all,

Since it was hard to find information on Minolta F.ROKKOR-QF 1:5.6 f=200mm lens and it's applicability to 8x10, I thought I'd post here my result. The lens, which is a "fax" process lens, is possible to fit into Shanel - 5B shutter, I did it with 3D printed adapter rings. The cells are 0.7mm farther apart than in original barrel but it doesn't seem to impact image quality. Center of image is sharp fully open (1:5.6) with blur around edges, I'd say pleasing effect. When stopped down to 1:11, it's sharp across the film. The lens can cover 8x10 with small movements. Considering it can be found on auction places quite cheap and the Shanel - 5B shutter cost is also reasonable, I use it as an affordable wide angle on my Intrepid 8x10.





I'd be happy to answer any questions,
cheers,
Radek.

[xkaes]

I've often wondered how these FAX lenses would perform on LF cameras. Seems like a good inexpensive option for some -- if a spare shutter is available.

How did you manage to adapter it to the 5B?

[Mark Sampson]

Nice work. As you know, wide-angle lenses for 8x10 are rare, often very large, and usually expensive- looks like you've solved that problem!

[xkaes]

Makes me wonder how many completely-usable FAX lenses end up in the dump every day.

[Dan Fromm]

Interesting. I'd thought that those Minolta lenses' elements weren't mounted in cells that could be unscrewed.

[xkaes]

Exactly why I asked "How did you manage to adapter it to the 5B?"

[radeks]

It was possible to unscrew the cells, my tool was "strap wrench" for sink. Image is worth thousand words ;-).
BTW, it's still a heavy lens in shutter, 1000g!



cheers,
Radek.

[Dan Fromm]

Ah! Thanks for the reply.

[David Lindquist]

So did the cells then screw directly in to the Shanel shutter with the correct spacing, seems unlikely. Or how was this done?

David

[radeks]

No, I had to create adapter rings, 3D printed, one for rear cell and one for front cell with internal thread fitting the cell and external thread fitting the shutter. The cell spacing is 0.7mm longer because bottom cell was hitting shutter aperture if I was trying to get closer. The 0.7 mm longer spacing doesn't seem to have any noticeable effect on image quality.

Radek.