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olympus OM lenses in eclair NPR


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#1 andres victorero

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Posted 15 September 2005 - 02:22 PM

Hi I have some still lenses of my olympus OM camera.
I´m thinking to buy a c mount adapter olympus OM <--------------------> c mount and use a great lens like 50 mm. f 1.4. in my eclair NPR - ACL1
What do you think about this? is this a good idea? which are a good prime lenses for eclair npr?

thanks a lot.

Edited by andres victorero, 15 September 2005 - 02:23 PM.

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#2 Ian Marks

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Posted 15 September 2005 - 03:12 PM

The Zuiko lenses for the Olympus OM camera ranges are very good and will definitely mount to your Eclair via an OM to C-mount adapter, which you can buy for around $15-25. They have the added advantage of being small and lightweight, so they won't put a lot of strain on the C-mount. A 50mm f1.4 will create a telephoto lens on a 16mm camera, of course. A 24mm will become a "normal" lens.

One caveat: check to see if the diaphragms on your OM-mount lenses are wide open or closed down to the selected stop when they are mounted to the C-mount adapter. You might have to defeat the automatic diaphragm mechanism of the lenses if they are wide open. I like the Nikon manual focus lenses because they are always stopped down to the selected aperture by default. The Canon FD's stay open when you take them off a Canon body, but the C-mount adapter I have has a ring to stop them down or open them up, effectively turning them into pre-set lenses - very handy. Hope this helps.
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#3 Scott Bullock

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Posted 06 January 2006 - 07:17 PM

Ian Marks wrote:

"The Canon FD's stay open when you take them off a Canon body, but the C-mount adapter I have has a ring to stop them down or open them up, effectively turning them into pre-set lenses - very handy. Hope this helps."

Can you tell me where you purchased your adapter and/or who manufactured it? I purchased a C-mount to Canon FD adapter with the intention of testing some Canon FD still lenses that I have. However, when I mount the lens to the adapter the aperture remains in the open position when I try to stop it down. Is this a defective adapter or am I just an idiot? I don't have any problems when using my C-mount to Nikon F adapter; it works splendidly. The Canon one, however, has my stymied.

Anyone else have some advice to offer?

Thanks in advance.
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#4 Ian Marks

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Posted 06 January 2006 - 08:30 PM

"Can you tell me where you purchased your adapter and/or who manufactured it? I purchased a C-mount to Canon FD adapter with the intention of testing some Canon FD still lenses that I have. However, when I mount the lens to the adapter the aperture remains in the open position when I try to stop it down. Is this a defective adapter or am I just an idiot? I don't have any problems when using my C-mount to Nikon F adapter; it works splendidly. The Canon one, however, has my stymied."

I don't know who manufactured my adapter and it doesn't bear any identifying markings. If you watch Ebay for a while I'm sure one just like it will come up - just look for a ring on the adapter that says "open - close" or "C - O" or something like that. It really is a nice feature, as you can open the aperture to focus and then instantly stop down to your preselected aperture to shoot.

All of my FD's are the old breech-lock type with the chrome ring. On my lenses, I believe that the diaphragm actuation lever (the one with a kind of "dog leg" cut out of it) can be pressed in and will lock into place, making the aperture work manually, like a cine lens (this is according to memory, as I don't have a lens in front of me). Hope this helps.
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#5 Scott Bullock

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Posted 06 January 2006 - 09:43 PM

"All of my FD's are the old breech-lock type with the chrome ring. On my lenses, I believe that the diaphragm actuation lever (the one with a kind of "dog leg" cut out of it) can be pressed in and will lock into place, making the aperture work manually, like a cine lens (this is according to memory, as I don't have a lens in front of me). Hope this helps."

It makes complete sense that the adapter I purchased should have some kind of "open and close" ring for the aperture, but it doesn't. My lenses are exactly as you described; you mount the lens and then turn the silver ring 90º to lock it in place. I tried to get the aperture lever to lock to no avail. Could it be that I have the wrong adapter? It seems like it should work because my lenses mount on it without any problems. Obviously, however, it's not going to do me any good if I have to shoot everything at open aperture. :( Maybe the adapter was designed for FL lenses instead of FD ones; I'm not sure if the mounts on these lenses were different or not. If I could just get the guy who sold it to me to answer my emails . . . <_<
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#6 Leo Anthony Vale

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Posted 07 January 2006 - 01:34 PM

Maybe the adapter was designed for FL lenses instead of FD ones; I'm not sure if the mounts on these lenses were different or not. If I could just get the guy who sold it to me to answer my emails . . . <_<


---FL and FD breech lock mounts are identical.
The FL can switch between Auto and Manual.

---LV
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#7 Scott Bullock

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Posted 07 January 2006 - 06:37 PM

Thanks Leo!

I think I've found a place that sells a proper adapter for my FD lenses. I'll let y'all know when it arrives.
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