I ruled out the extended lens board for this lens as my current cameras have pretty light front standards. I've been considering making a tailboard camera for the beast. And I've had my eye on an even heavier lens so it might still happen.
I wanted to do a trapezoidal box but wasn't committed as I hadn't figured out my method of focus yet. And yes, cutting the wood would be a pain.
I think I'm settling on the sliding box design with the front box slightly larger (maybe 7"x7") and having tripod mounts and a lensboard holder. The smaller rear box will provide my focusing. Being an engineer I'm angry I didn't come up with the rear focus idea myself.
New questions are:
[1] With the double wall construction, I guess the inner walls can be a much lighter material? Maybe a heavy cardstock?
[2] How do you guys get the two boxes to slide smoothly? I'm thinking maybe some teflon runner angles or teflon tape. It'll make it slide easier, but introduce more of a gap for light. I don't have faith in myself to make the two boxes so closely aligned as to slide easily without some "help".
[3] For the interior I was planning to hit it with flat black primer and blow in some flocking while it's still wet, let it dry, and then hit it with another coat of primer. Is this satisfactory?
[4] Since I'm planning on exposures of a couple seconds I was going to go without a proper shutter at first. Does a flap of black felt thrown over the lens provide less chance of a blurred exposure than trying to put on the lens cap?
Thanks,
Terence
From: Nick Zentena <[EMAIL PROTECTED]>
Reply-To: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Subject: Re: [Cameramakers] Method of focusing
Date: Mon, 25 Nov 2002 15:31:42 -0500
On November 25, 2002 02:07 pm, [EMAIL PROTECTED] wrote:
> Subject: Re: [Cameramakers] Method of focusing
> Date: Sun, 24 Nov 2002 12:54:06 -0800
> Reply-To: [EMAIL PROTECTED]
>
> If you want to get really cheap, Harbor Freight Tools sells a aluminum bar
> clamp that's 36 inches long, and wouldn't take much to make into a monorail
Why not just a pipe clamp? They attach to black gas pipe and can easily to
made to the length you want. In both cases won't weight be an issue?
Instead how about some 1/4" channel ? Put it in a piece of of plywood. A
little more money. But I think the prices in the link are Canadian.
http://www.leevalley.com/wood/page.asp?page=45161&category=1,43455,43830&ccurrency=1&SID=
The other thing with a lens that heavy you're going to have to build the
front strong but that's obvious I guess.
If you check the leevalley there is various jig hardware that is standard
1/4" size. Use it for ideas.
Front rise would seem easy. An oversized lensboard in a couple of grooves.
Put some sort of system to hold the board in position. Wouldn't need to be
more then pegs.
Nick
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