did i just get a broken lens? at DVinfo.net

Min Lee · April 19th, 2006, 02:13 PM

I bought a lens of ebay and I dunno much about slr lens. When I turn the aperature ring the iris doesn't change. Also, there is a little A button on the aperature ring. I'm guessing that means auto. Maybe it needs to be connected to the camera to work. Do I need one that's just manual only or is this particular lens busted?

Here's the link btw. I have a few days to return it so I'd appreciate a quick response. Thanks.

http://cgi.ebay.com/ws/eBayISAPI.dll...DME:L:AAQ:US:1

Wayne Kinney · April 19th, 2006, 02:35 PM

Hi,
This is normal for a Canon FD lens. There is a pin on the back of the lens that needs to be pushed all the way over to enable manual aperture, and also it will only work once the lens is attached to mount.

http://208.186.78.36/zeffphoto.com/e...NS09592L-2.jpg

Its the longer lever on the left

Also this image provided by Quyen Le: http://letus35.com/type1.JPG

Some lenses, the lever will stay on its own, others need to have something jammed in there to keep the lever over.

Min Lee · April 19th, 2006, 05:30 PM

whew.. good to know that. What about if I put the back lens cap on? I'm planning on making a ghetto adapter, not for any serious work but just to play with. I was going to drill a hole through the cap instead of buying a lens mount. Would it function correctly that way?

thanks wayne

Wayne Kinney · April 20th, 2006, 01:51 AM

Min,

Yes it will work that way, however most rear lens caps dont allow the breech lock to rotate all the way through its travel, so you will have to sand the 3 bayonet lugs on the plastic cap to make them 'thinner'

I would suggest buying some cheap Canon FD extension tubes from ebay. Here is an example:

http://search.ebay.com/search/search...ube&category0=

There are loads of these available cheaply. They are metal so nice and solid, and is easy to canibalize and attach to an adapter. I just did the same for a 'custom SG35' shown here:

http://www.sysmicfilms.com/wayne/04.jpg

Hope that helps,

Bill Porter · April 20th, 2006, 07:21 PM

I personally recommend making a ghetto adapter. It's 90% of the work of making a really nice adapter that's totally usable. With a ghetto one, you can hardly use it since it'll be unstable and the image quality will be annoying. I'm not sure what you have in mind but I imagine that with a lens cap as a mount, when you go to focus, things will be flexing and slopping around. And not very stable to be hanging a heavy piece of glass off of!

Making a static one with emptied-out filter rings and extension tubes is very easy and a great way to start.

April 19th, 2006, 02:13 PM	#1
Min Lee Major Player Join Date: Sep 2005 Location: San Francisco, CA Posts: 200	did i just get a broken lens? I bought a lens of ebay and I dunno much about slr lens. When I turn the aperature ring the iris doesn't change. Also, there is a little A button on the aperature ring. I'm guessing that means auto. Maybe it needs to be connected to the camera to work. Do I need one that's just manual only or is this particular lens busted? Here's the link btw. I have a few days to return it so I'd appreciate a quick response. Thanks. http://cgi.ebay.com/ws/eBayISAPI.dll...DME:L:AAQ:US:1

April 19th, 2006, 02:35 PM	#2
Wayne Kinney Major Player Join Date: Jun 2005 Location: Brighton, East Sussex, UK Posts: 938	Hi, This is normal for a Canon FD lens. There is a pin on the back of the lens that needs to be pushed all the way over to enable manual aperture, and also it will only work once the lens is attached to mount. http://208.186.78.36/zeffphoto.com/e...NS09592L-2.jpg Its the longer lever on the left Also this image provided by Quyen Le: http://letus35.com/type1.JPG Some lenses, the lever will stay on its own, others need to have something jammed in there to keep the lever over. __________________ Thanks, Wayne.

April 20th, 2006, 01:51 AM	#4
Wayne Kinney Major Player Join Date: Jun 2005 Location: Brighton, East Sussex, UK Posts: 938	Min, Yes it will work that way, however most rear lens caps dont allow the breech lock to rotate all the way through its travel, so you will have to sand the 3 bayonet lugs on the plastic cap to make them 'thinner' I would suggest buying some cheap Canon FD extension tubes from ebay. Here is an example: http://search.ebay.com/search/search...ube&category0= There are loads of these available cheaply. They are metal so nice and solid, and is easy to canibalize and attach to an adapter. I just did the same for a 'custom SG35' shown here: http://www.sysmicfilms.com/wayne/04.jpg Hope that helps, __________________ Thanks, Wayne.

April 19th, 2006, 05:30 PM	#3
Min Lee Major Player Join Date: Sep 2005 Location: San Francisco, CA Posts: 200	whew.. good to know that. What about if I put the back lens cap on? I'm planning on making a ghetto adapter, not for any serious work but just to play with. I was going to drill a hole through the cap instead of buying a lens mount. Would it function correctly that way? thanks wayne

April 20th, 2006, 07:21 PM	#5
Bill Porter Major Player Join Date: Mar 2005 Location: Ventura, California, USA Posts: 751	I personally recommend making a ghetto adapter. It's 90% of the work of making a really nice adapter that's totally usable. With a ghetto one, you can hardly use it since it'll be unstable and the image quality will be annoying. I'm not sure what you have in mind but I imagine that with a lens cap as a mount, when you go to focus, things will be flexing and slopping around. And not very stable to be hanging a heavy piece of glass off of! Making a static one with emptied-out filter rings and extension tubes is very easy and a great way to start.