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How to hollow out squared off cone for 4x5 camera.

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Forum topic by Whimsy posted 10-14-2011 04:42 PM 2488 views 0 times favorited 4 replies Add to Favorites Watch
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Whimsy

5 posts in 1102 days


10-14-2011 04:42 PM

Topic tags/keywords: camera cone

Hello all,

Long time lurker and hoping to get some advise on a small project.

I’m a beginning woodworker and am trying to build a small 4×5 camera. I am trying to figure out a method of carving the cone. The rough dimensions are 4.5”x5.5”x2” and possibly 1/4 ” thick.

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I don’t have a lathe and am not sure that the interior could be made on one anyway.Any ideas would be appreciated. Also, for different lenses different cone lengths would be needed so a repeatable adjustable method would be cool.

Thanks,

Gerald

-- Gerald


4 replies so far

View yrob's profile

yrob

340 posts in 2337 days


#1 posted 10-14-2011 05:39 PM

I would not carve it. I would make a box with the arcs on the sides. I would then take 1/4” (or less) wood and do I would steam bend that upper piece and glue it to the box. Finally cut the circle hole and the rabbet around it.
For a different lens, all you would have to do is add an extra box with square sides underneath to increase the distance to focal plane.

-- Yves

View Alan S's profile

Alan S

172 posts in 2002 days


#2 posted 10-14-2011 08:12 PM

Is there an optical reason that this piece has to be curved as shown? Why not just have a rectangular hollowed-out box that positions the lens in the proper place?
Alan

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Whimsy

5 posts in 1102 days


#3 posted 10-14-2011 09:01 PM

@Alan S

Optically, it changes nothing. In fact a lot of diy pinhole cameras are simple boxes to avoid cutting complex shapes. Its more of a design preference. Since the image is projected in a cone the leading corners can be removed making it slightly less boxy.

Here are 3 examples of the type of camera I am trying to do. If posting others images are frowned on I will remove.

http://www.fotomancamera.com/product_list.asp?id=335

a similar diy version http://blog.makezine.com/archive/2006/12/darth-handy-homemade-came.html

and a diy version from a wooden flower pot. http://on-your-kitchen-worktop.blogspot.com/search/label/4x5

-- Gerald

View jeth's profile

jeth

210 posts in 1523 days


#4 posted 10-14-2011 09:58 PM

You could make a router jig, similar to a planing sled but with curved sides so that the router travels in an arc.

That would work for the outside but might be tricky for the inside. The inside you could hog out the better part of the waste with the router or drill press and finish with a chisel/files.

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