question about 50mm reversed lens ?

just a quick question guys.

seen a few people use reverse 50mm len on there macro lenses.

i have a sigma 105mm and seen a canon fd 50mm f1.8 lens, its for manual focus film slrs, and was told this wont fit onto eos canons.

main question is will i be able to use it as a reversed 50mm conciderng its for film slr, on my sigma 105mm 58mm lens, and can i buy the adaptor?

would it work ok as seem other people useing 50mm lenses reversed,

thanks

jjcool wrote in post #5955327
just a quick question guys.

seen a few people use reverse 50mm len on there macro lenses.

i have a sigma 105mm and seen a canon fd 50mm f1.8 lens, its for manual focus film slrs, and was told this wont fit onto eos canons.

main question is will i be able to use it as a reversed 50mm conciderng its for film slr, on my sigma 105mm 58mm lens, and can i buy the adaptor?

would it work ok as seem other people useing 50mm lenses reversed,

thanks

If it has a manual aperture ring, it will work like a charm when reversed. From what I remember FD lenses do have this, but maybe someone else can enlighten us.

Kind regards, Wim

what do u mean a manual aperture ring?

heres a picture of it so hopefully you might be able to tell.

Some ramblings from the nearly mentally unfit

First, I'm not sure that what contemplate is practical, at least, the way you seem to be thinking. Canon FD lenses--at least the ones I've seen--are not the best choice.

First, unless you mount them on some kind of camera or adapter, you cannot manually stop them down.

Second, there are two kinds of common adaptors for Canon EF mount to FD lens, some of which you can convert

A: There exist (ebay) import adapters WITHOUT lens elements, which would allow FL/ FD lenses to be used as a macro lens, and they will not focus to infinity. You can "enhance" the macro effect by using some sort of extension tubes, in this case, either FD or EF mount tubes should work

B: There exist adaptors WITH glass which allow these lenses to focus to infinity, but the elements in the adaptors does the image quality no good. You can, however, on some of these, remove the glass element and use them as a macro only lens

Third: If you try and gee-hah a reversing ring and mount the Canon lens on some OTHER lens, I think you'll find the results unpredictable. The NORMAL (old) way to use a reversing ring is it mounts directly to the camera, and then you screw your lens onto this ring reversed--there is only one lens on the camera. In this case, you'd still need some sort of adaptor or mount hooked to the Canon FD lens to allow you to stop it down. Otherwise, it's wide open

Frankly, unless you got this dirt cheap, seems to me a different approach is better. In my case, I shoot some of the old Tamron Adaptall lenses, and a few of them have built-in macro capability. I also have (don't use) my old Minolta MD mount lenses, and one or two of them could be reversed in the previously described manner.

Additionally: If you get to playing with this lens, you'll probably find that you CANNOT figure out how to stop it down. That's because, when these are not mounted on a camera, and the bayonet ring is properly locked "open" the aperture mechanism is locked wide open. One of the two rear levers should move, and one probably won't.

Some old manual lenses, such as Takumar, and Tamron Adapt-a-Matic, have an "auto manual" switch, and these of course WILL stop down manually. I believe Contax / Yashica do, and Pentax. The aforementioned Minolta will, also.