Help to ID this lens.

[Mark Sawyer]

First, measure the focal length and aperture to see if it's really an f/5.6 wide open. Could be a Frankenstein lens as you suggested, or damaged, or in the wrong shutter upsetting the spacing.

[Greg]

First, measure the focal length and aperture to see if it's really an f/5.6 wide open.

Rough measurements (didn't have a ruler with me at the time) put the max aperture between f/11-f/16. With no lens brand on the front elements, again makes me think "two rear elements from two wide angle lenses"

[xkaes]

Rough measurements (didn't have a ruler with me at the time) put the max aperture between f/11-f/16. With no lens brand on the front elements, again makes me think "two rear elements from two wide angle lenses"

I think you are right -- and if they are Fujinon, they are not marked. Only the front elements were. And the black shutter means it's fairly recent.

You can figure it out -- assuming they are Fujinon by looking at the shutter and the front and rear diameters of what you have.

http://www.subclub.org/fujinon/byseries.htm

The Fujinon NSW (they never made a NSWD) 90mm has a 67mm filter thread, but the 105mm is 77mm, for example.

Whether you can use "them", as is?????????????

[aphcl84]

The Fujinon NSW (they never made a NSWD) 90mm has a 67mm filter thread, but the 105mm is 77mm, for example.

They absolutely did, when they switched to the new style outside writing lenses the optical design was changed from 8-4 to 8-6 and released sales materials calling them "NSWD" also some of the later 90mm rear lens cells are a smaller diameter to fit cameras better. See attached optical layout.