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Old 18th of January 2008 (Fri)   #1
Viky
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Angry Canon FD lens... stuck aperture??

Hi,

I bought a canon 28mm f/2.8 FD lend off ebay for reverse macro work.

Just received the item today, but I don't seem to be able to get the aperture to change. Attached is a pic of the lens.... you can see the aperture blades and they remain in the same position even if i change the aperture setting from 2.8 to 22

I have never used or handled an FD mount lens so it could also be doing it the wrong way...

Any help would be appreciated..

Thanks in advance.

Viky
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File Type: jpg lens.jpg (133.1 KB, 360 views)
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Last edited by Viky : 18th of January 2008 (Fri) at 05:17.
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Old 18th of January 2008 (Fri)   #2
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Default Re: Canon FD lens... stuck aperture??

I don't have one in front of me, so I can't "talk you through it". The aperture ring only controls the blades if the lens is mounted to a camera, or you have worked the mount so it "thinks" it's mounted. I remember there being a release pin of sorts that you need to press. Then you have to turn the inner workings of the mount as it would be if mounted to a body. Just play around with it, you'll figure it out!
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Old 18th of January 2008 (Fri)   #3
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Default Re: Canon FD lens... stuck aperture??

Yes, i thought so too, however in the un-mounted state, the aperture blades should be wide open at 2.8 right? but look at the aperture blades and it looks stopped down to me..
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Old 18th of January 2008 (Fri)   #4
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Default Re: Canon FD lens... stuck aperture??

Quote:
Originally Posted by Viky View Post
Yes, i thought so too, however in the un-mounted state, the aperture blades should be wide open at 2.8 right?
That's not always the case. My friend has a 50/1.4 on his AE-1 and it stops down to some arbitrary aperture when he take the lens off.
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Old 18th of January 2008 (Fri)   #5
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Default Re: Canon FD lens... stuck aperture??

Here's a helpful website: http://www.mir.com.my/rb/photography...enses/28mm.htm
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Old 18th of January 2008 (Fri)   #6
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Default Re: Canon FD lens... stuck aperture??

Normal...
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Old 18th of January 2008 (Fri)   #7
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Default Re: Canon FD lens... stuck aperture??

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Originally Posted by shutterfiend View Post
Thanks for the link... this confirms that the aperture blades remaining 'stopped down' in unmounted state is normal.

However, how do i change the aperture in unmounted state?
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Old 18th of January 2008 (Fri)   #8
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Default Re: Canon FD lens... stuck aperture??

Quote:
Originally Posted by Viky View Post
Thanks for the link... this confirms that the aperture blades remaining 'stopped down' in unmounted state is normal.

However, how do i change the aperture in unmounted state?
Leave it set to wide open on the lens, then just trying poking around the various pins on the back.
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Old 18th of January 2008 (Fri)   #9
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Default Re: Canon FD lens... stuck aperture??

I think you might have to slide "1" into locked position while holding "2" down. Play around with those two, it should work.

Disclaimer: I've never had any FD lenses ever. Never use excessive force.

Last edited by shutterfiend : 5th of September 2008 (Fri) at 06:59.
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Old 18th of January 2008 (Fri)   #10
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Default Re: Canon FD lens... stuck aperture??

Its not stuck. Its made to open & stop down when mounted on a camera.



Heres a photo looking at the back of an FD lens. The two rectangular pins are safety locks that depress when the lens is mounted on the camera. So take a pencil or some pointed sharp object and press down on those two rectangular safety lock pins and at the same time turn the inside area of the lens in the direction of the arrows (clock wise). Try the pin closest to the red dot first and try to turn will pressing the pin. it should slightly shift then push the other pin while turning and that should unlock it. Then turn it all the way and the lens should be wide open and the lens locking pin (the one you push to remove the lens should have popped up. To turn it back push the pocking pin on the side of the lens barrel (the one you use push when you mount and unmount the lens) and turn it back counter clock wise till it clicks in place.
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Old 18th of January 2008 (Fri)   #11
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Default Re: Canon FD lens... stuck aperture??

Looks like shutterfield beat me to it gotta be fast around here..
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Old 18th of January 2008 (Fri)   #12
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Default Re: Canon FD lens... stuck aperture??

I cant seem to be able to press either one down.

Pin 2 does move a little towards the right... however pin 1 is fixed and wouldn't move either left, right or down... even while holding Pin 1 pressed towards the right
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Old 18th of January 2008 (Fri)   #13
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Default Re: Canon FD lens... stuck aperture??

Quote:
Originally Posted by airfrogusmc View Post
Its not stuck. Its made to open & stop down when mounted on a camera.



Heres a photo looking at the back of an FD lens. The two rectangular pins are safety locks that depress when the lens is mounted on the camera. So take a pencil or some pointed sharp object and press down on those two rectangular safety lock pins and at the same time turn the inside area of the lens in the direction of the arrows (clock wise). Try the pin closest to the red dot first and try to turn will pressing the pin. it should slightly shift then push the other pin while turning and that should unlock it. Then turn it all the way and the lens should be wide open and the lens locking pin (the one you push to remove the lens should have popped up. To turn it back push the pocking pin on the side of the lens barrel (the one you use push when you mount and unmount the lens) and turn it back counter clock wise till it clicks in place.
Whoa!! done it!

Thanks a ton for the detailed explanation
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Old 18th of January 2008 (Fri)   #14
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Default Re: Canon FD lens... stuck aperture??

Glad it worked you're welcome..
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Old 18th of January 2008 (Fri)   #15
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Default Re: Canon FD lens... stuck aperture??

Thanks everybody for all the help! i really appreciate it

Here's my first attempt with the 28mm at reverse macro

#1 is with the 50mm
#2 is with the reverse macro with closeup on the AMD Turion logo
Attached Images
File Type: jpg IMG_0788.jpg (32.4 KB, 312 views)
File Type: jpg IMG_0785a.jpg (29.9 KB, 305 views)
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Last edited by Viky : 18th of January 2008 (Fri) at 09:46.
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