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Olympus-OM

Re: [OM] 20mm f2 and Lieberkuhn Lighting

Subject: Re: [OM] 20mm f2 and Lieberkuhn Lighting
From: Moose <olymoose@xxxxxxxxx>
Date: Fri, 16 Mar 2018 15:06:32 -0700
On 3/16/2018 11:05 AM, Jan Steinman via olympus wrote:
From: JOHN DUGGAN <john.duggan10@xxxxxxxxxxxxxx>

Does anyone have info on Leiberkulm reflectors regarding the radius of the 
reflecting surface. It should be straightforward to machine? in white plastic 
or aluminium given this dimension. failing this I will experiment with the 
curved bases of drinks cans or bottled gas containers etc.
This guy has done all the math and will 3-D print them for you for under ten 
bucks:

Description of the design process and results:
        
https://thebilder.wordpress.com/2014/03/25/first-tests-of-3d-printed-lieberkuhn-reflectors/

Order page:
        
https://www.shapeways.com/product/R9NYJJUE6/lieberkuhn-reflector-49mm-lens-diameter-f-20mm?optionId=57933798&li=marketplace

I've ordered one.

Damn evilBay sale tapped me out for a while, but I’m seriously considering 
getting one of these, rather than cobbling something together.

He has put a lot of work into getting the proper parabolic shape and focal 
length.

But I think he has worked on the assumption that they are mounted on filter threads a couple of mm in front of the lens FE, not ~17 mm behind. A 20 mm or so difference is huge for any such calculation. I'll see how it works when it gets here.

Better would be to duplicate the Oly ones on a 3D printer.

Reflective Moose

He even sells a set of four for Canon 62mm thread-size macro lens, for use at four 
different reproduction ratios. But I’m thinking just about any old bit of white 
stuff you can put there will work Pretty Durn Well(TM).

Jan


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