Worley 35mm adapter test

After a few months since we got this 35mm vibrating adapter (with achromat) from Worley, JBQ and I tested it tonight. I am concerned about the extreme vignetting that I am getting. I can’t zoom in any more towards the ground glass because the HV20 wouldn’t focus that close, so I am not happy about that part. If you have any tips, I am all ears. I am wondering if I need a different ground glass.


joe wrote on October 5th, 2008 at 11:39 PM PST:

I think you just need spacers. That’s why they always bring up ring 3 in the HV20 forums when it comes to achromat + diy adapters.

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Eugenia wrote on October 5th, 2008 at 11:55 PM PST:

I think I just need a better ground glass. The current one is way too grainy IMO.

joe wrote on October 6th, 2008 at 12:42 AM PST:

IIRC Worley uses the canon ee-s. You could switch to the ee-a. Very little vignetting. If you switch to a custom ground glass like Alex MD’s then you’d need a condenser lens.

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Eugenia wrote on October 6th, 2008 at 12:56 AM PST:

I don’t think mine is a Canon. Mine was literally the last adapter Worley made before he closed shop, and he said that he was out of Canon screens. So he used something else.

Worley wrote on October 7th, 2008 at 5:29 AM PST:

Hello Eugenia,

The screen was a 35 micron DIY one. I don’t recall if you had the achromat, but that will help reduce (not eliminate) the vignetting.

What lens are you using – if you have it stopped down to below f2.4 then the vignetting will be worse. (I have always had excellent results from my Vivitar zoom lens, even when stopped down to well below f3.5.)


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Eugenia wrote on October 7th, 2008 at 1:29 PM PST:

Hi W, yes, I use an Opteka achromat. The lens was an EF 28mm f/2.8 wide open (that’s a plain non-telecentric design as far as I know).

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