Question about Canon FD lenses and C-Mount adaptors

[Blue Audio Visual]

I wonder if anyone here on the forum can help? I've used Nikon to C-mount adaptors before, and I've got access to a number of fast Canon FD lenses, so I was thinking about buying an FD adaptor.

But...

Do Canon FD adaptors have a mechanism built in to override the lock on the aperture when the FD lens is not mounted on a body? Or do you have to do something to the FD lens?

It would seem obvious that they wouldn't be sold if they had no practical use, so I assume that there is a simple answer.

Any ideas?

Bart

[andredigital]

Hello Bart!

I have the same problem. I bought one of these CanonFD to c-mount adapter rings and now i only can use it with my FD-Lenses with open aperture

maybe there are different adapters out there?

??
André

[clivetobin]

...I bought one of these CanonFD to c-mount adapter rings and now i only can use it with my FD-Lenses with open aperture ...

You need the Manual Diaphragm Adapter. This is a little plastic thingie made by Canon that looks to be worth about a cent, that fits into one of the movable arms in slots on the back of the lens. This enables the iris to be adjusted when not actually mounted on a Canon camera.

[sarmoti]

I've never heard of the manual adapter but I do know that if you have the lens mounted on an SLR, set to the stop you want and remove it while a long exposure is triggered, the iris will remain at that stop so you can then attach it to the adapter and have the exposure setting you want.

Another more sophisticated option is this controller (note that it's for the tech savy): http://www.birger.com/Merchant2/merchan ... ef232_home[/url]

[jpolzfuss]

Hi,

I just did a quick search for '"Manual Diaphragm Adapter" Canon FD' and found these two interesting links:

Phots and description

Some comments about different versions of Canon-FD->C-Mount-adapters

I also found some eBay-auctions and some British shops selling this little plastic gadget for 6 pounds...

Jörg