How to attach a rear lens cap to an electronics box? at DVinfo.net

Carl Jakobsson · June 6th, 2006, 11:39 AM

Hello!

I'm building a spinner and I'm about to enclose it in an electronics box made of ABS plastic. Now I need some advice to attach my Canon 1.4 FD lens to the box. A common method as I've understood is to buy a rear lenscap, like this http://images.tradera.com/061/33850061_1.jpg, drill a big hole in the back and then attach it to the box. The problem I see is how to attach the lens cap to the box. I guess glueing is no option, because the 1.4 FD is quite heavy. Is there a common solution to this problem, or should I try a different approach?

The best thing would probably be to buy a non working Canon body and just keep the mount. However, those bodies seem to be quite expensive.

Another option would be to CNC a custom mount, but I don't have the required resources and machinery.

Any tips and suggestions are welcome!

Cheers
Carl

Wayne Kinney · June 6th, 2006, 12:53 PM

Hi,

Its best to get yourself a cheap FD extension tube off ebay, and then drill and bolt this to the from of the box. Also, the ABS box will have some flex, best to find a die cast aluminium box.

Carl Jakobsson · June 6th, 2006, 02:29 PM

Thanks for the tips. Your right about the flexing. I consider that when buying a box.

As you wrote, I saw a lot of extension tubes on eBay. Looking at this one, http://www.mesadelsol.com/dad/6-5a/DSC_8274.jpg, replacing the screws should be a piece of cake!

By the way, do all Canon FD have the same mount? Stupid question maybe, but you never know... :)

Wayne Kinney · June 6th, 2006, 03:43 PM

Hi,

Yes im sure that will fit all your FD lenses

Frank Hool · June 6th, 2006, 04:06 PM

i had canon fd rear cap with collar, machined exact cell for cap(cap sit there really tight). Collar had space in cell as well. Then it took some screws to fix cap using collar.

Bob Hart · June 6th, 2006, 06:50 PM

If you are going to cut up an extention tube, I would recommend leaving it intact, taking it right through the box so that it is easier to set up your centre for the camcorder mount, then cut a clearance in the tube for the disk to run in. If the tube goes right through the box or is long enough for an extention to be sleeved over it snugly, you then should not have to worry about flex unless you are supporting rods and a matte box directly off the front.

Carl Jakobsson · June 12th, 2006, 02:57 PM

http://cgi.ebay.com/ws/eBayISAPI.dll...tem=7615694866
I bought this one. The seller confirmed that the mount was detachble with three screws.

A tip for those looking for an FD-mount is this item,

http://cgi.ebay.com/ws/eBayISAPI.dll...MEWA%3AIT&rd=1
Unfortunately the shipping became too expensive.

So far I've bought all lenses and other stuff on eBay for my adapter. I don't know why those things are so expensive in Sweden.

June 6th, 2006, 11:39 AM	#1
Carl Jakobsson Regular Crew Join Date: Dec 2005 Location: Lund, Sweden Posts: 122	How to attach a rear lens cap to an electronics box? Hello! I'm building a spinner and I'm about to enclose it in an electronics box made of ABS plastic. Now I need some advice to attach my Canon 1.4 FD lens to the box. A common method as I've understood is to buy a rear lenscap, like this http://images.tradera.com/061/33850061_1.jpg, drill a big hole in the back and then attach it to the box. The problem I see is how to attach the lens cap to the box. I guess glueing is no option, because the 1.4 FD is quite heavy. Is there a common solution to this problem, or should I try a different approach? The best thing would probably be to buy a non working Canon body and just keep the mount. However, those bodies seem to be quite expensive. Another option would be to CNC a custom mount, but I don't have the required resources and machinery. Any tips and suggestions are welcome! Cheers Carl __________________ http://www.nattvard.com

June 6th, 2006, 12:53 PM	#2
Wayne Kinney Major Player Join Date: Jun 2005 Location: Brighton, East Sussex, UK Posts: 938	Hi, Its best to get yourself a cheap FD extension tube off ebay, and then drill and bolt this to the from of the box. Also, the ABS box will have some flex, best to find a die cast aluminium box. __________________ Thanks, Wayne.

June 6th, 2006, 02:29 PM	#3
Carl Jakobsson Regular Crew Join Date: Dec 2005 Location: Lund, Sweden Posts: 122	Thanks for the tips. Your right about the flexing. I consider that when buying a box. As you wrote, I saw a lot of extension tubes on eBay. Looking at this one, http://www.mesadelsol.com/dad/6-5a/DSC_8274.jpg, replacing the screws should be a piece of cake! By the way, do all Canon FD have the same mount? Stupid question maybe, but you never know... :) __________________ http://www.nattvard.com

June 6th, 2006, 03:43 PM	#4
Wayne Kinney Major Player Join Date: Jun 2005 Location: Brighton, East Sussex, UK Posts: 938	Hi, Yes im sure that will fit all your FD lenses __________________ Thanks, Wayne.

June 12th, 2006, 02:57 PM	#7
Carl Jakobsson Regular Crew Join Date: Dec 2005 Location: Lund, Sweden Posts: 122	http://cgi.ebay.com/ws/eBayISAPI.dll...tem=7615694866 I bought this one. The seller confirmed that the mount was detachble with three screws. A tip for those looking for an FD-mount is this item, http://cgi.ebay.com/ws/eBayISAPI.dll...MEWA%3AIT&rd=1 Unfortunately the shipping became too expensive. So far I've bought all lenses and other stuff on eBay for my adapter. I don't know why those things are so expensive in Sweden. __________________ http://www.nattvard.com

June 6th, 2006, 04:06 PM	#5
Frank Hool Major Player Join Date: Apr 2006 Location: Barca Spain Posts: 384	i had canon fd rear cap with collar, machined exact cell for cap(cap sit there really tight). Collar had space in cell as well. Then it took some screws to fix cap using collar.

June 6th, 2006, 06:50 PM	#6
Bob Hart Inner Circle Join Date: Dec 2003 Location: PERTH. W.A. AUSTRALIA. Posts: 4,477	If you are going to cut up an extention tube, I would recommend leaving it intact, taking it right through the box so that it is easier to set up your centre for the camcorder mount, then cut a clearance in the tube for the disk to run in. If the tube goes right through the box or is long enough for an extention to be sleeved over it snugly, you then should not have to worry about flex unless you are supporting rods and a matte box directly off the front.