Lens Frankensteinization

[Will]

Alpa used a parallel lever mechanism to move the mirror in their SLR cameras to keep the body profile as thin as possible; Alpa offered a large number of lens adapters from other manufacturers that allowed the full range of focus with other lenses.

Honu-Hugger, any picture or diagram of the alpa internals?

 

[RJBender]

>>think of the difference in filter sizes between a 50mm 1.4 Nikon F mount lens (52mm) and a 50mm 1.4 for the Nikon rangefinder camera (43mm). <<

Actually, the difference in filter size is due mainly to the required linkage for the automatic diaphram plus the focusing helical (not present in the RF version). The glass is nearly identical (Nikon did have to readjust the formula for the SLR version to allow clearance for the mirror box but kept the front element the same size -- for the 105mm and 135mm lenses, there was no change in formula when remounted for the SLR). Light falloff is principally an issue with the wide angles, where the front elements are quite tiny on an RF lens and quite large on an SLR lens.

Yes, the wide angle lens is a better example of larger diameter glass to compensate for light falloff. 😉

R.J.

 

[Jeroen]

Electro 35's f/1.7 lens

I believe there is this Japanes guy out there on the internet who does this.

 

[brians]

Electro 35's f/1.7 lens

I believe there is this Japanes guy out there on the internet who does this.

It -must- be pretty expensive though. But I'd be interested to see how much it would run! 🙂

 

[RJBender]

It -must- be pretty expensive though. But I'd be interested to see how much it would run! 🙂

Check with this guy and see what he says:
http://www.markhama.com/

R.J.

 

[Sonnar Brian]

The Canon 50mm F1.5 front mated with the back end of the lens with the (small) scatches worked out very well, just got the first full roll back. The shims followed the focus mounts, not the lens modules. With the shims that came with the mounts in place, the focus at the filmgate agrees with the RF and the distance scale. The edge-to-edge looks great in the pictures, so the front/rear "mismatch" had no effect. Good quality control at Canon.

 

[Trius]

It would also be nice to be able to mount some of my Olympus OM lenses onto LTM camera bodies.
Surely that is possible. Research will need to be done.

Anyone got some donor parts?

Zuikozorki has a nice ring to it.

Cameraquest has adapters for OM-to-M mount: <http://www.cameraquest.com/adaptnew.htm> Don't know if you could successfully go from that to LTM. Just buy an M mount body!

Trius

 

[Poptart]

Clever Technique to Affix Lens Acc's?
Hello there. I've recently gotten hold of a pair of supplementary lenses made for a ricoh af rfdr and I want to use the elements alone--they come right out of the supplementary finder frames--on some of my other cameras that have similar lens diameters. (One is a close-up lens, the other a mild tele.) So the problem is, how do I temporarily affix the acc lens (which is secured into a black plastic ring with one flattened spot on the outer edge, and unthreaded inside or out) over my primary camera lens--without just holding it in place while I take the picture, that is. The acc lenses are glass and I don't want to end up scratching any lenses. Usually I can come up with some simple solution to these d.i.y. problems but this one has me stumped.

 

[Tarzak]

Cameraquest has adapters for OM-to-M mount: <http://www.cameraquest.com/adaptnew.htm> Don't know if you could successfully go from that to LTM. Just buy an M mount body!

Trius

Excellent!
Now, how do I convert my Zorki 4 to an M mount? 🙂

 

[RJBender]

Clever Technique to Affix Lens Acc's?
Hello there. I've recently gotten hold of a pair of supplementary lenses made for a ricoh af rfdr and I want to use the elements alone--they come right out of the supplementary finder frames--on some of my other cameras that have similar lens diameters. (One is a close-up lens, the other a mild tele.) So the problem is, how do I temporarily affix the acc lens (which is secured into a black plastic ring with one flattened spot on the outer edge, and unthreaded inside or out) over my primary camera lens--without just holding it in place while I take the picture, that is. The acc lenses are glass and I don't want to end up scratching any lenses. Usually I can come up with some simple solution to these d.i.y. problems but this one has me stumped.

I'm thinking of a step up ring or a cheap UV filter with the glass removed. 😕 Can you upload a picture of the lenses?

R.J.