65mm Super Angulon with DIY focus helical for 4x5

[Nimrod]

Nice. I made focusing ring for SA f/4 53mm from Flektogon f/4 50mm

[thafred]

That's cool! Actually, getting a MF lens for the focus ring was plan b. I was hoping to find a 35mm lens that is large enough just because its much easier and cheaper getting a scrap one.

Do the depth of field markings and actual focus line up in your design? neat when you can get the same focal length!

[thafred]

So, project is finished now. Just added all the bells and whistles I know I need. handles for better stability and as a bump protection for the lens. A tripod mount is epoxied into the wood and I mounted a hot shoe for flash photography (I use my GF Canon Speedlight for this)



The first picture at about 1m focus (f22 1/60th 400ASA Fomapan):
. by Friedrich Schiller, on Flickr

[Nimrod]

Do the depth of field markings and actual focus line up in your design? neat when you can get the same focal length!

Probably not. Will by a new markings.

[Jac@stafford.net]

A minor building hint. My first W/A was of wood body and back. I spent a lot of time planing the body to the correct thickness - ~1.5 millimeters short of focusing at infinity with the lens set to the infinity marking. Then for a light-proof gasket between the back and body I used 3M double sided adhesive tape #4220, 1.4mm thick, which was a compressible composite, like dense foam. The idea was to screw down the back's fasteners just enough to meet infinity, and the overall depth was as close as I could expect considering the wood plane I used.

That was eighteen years ago and the composite has shrunk. All it takes to make it all right again is to remove the back and replace the tape with new stock. Simple. Quick.

If I were to rebuild it I would remove more material and use two layers of the foam. That way the depth need not be as critical as ~.1mm.