Re: Re: sixty-five thousanths of an inch??

And his zone plates ain't shabby either! I had heard/read that it was too
difficult to make a zone plate for 35 mm, but the one Guillermo made for me
is almost too sharp! ;-)
Tina

>>From: "Michael Georgoff (SAL-US)" <Michael_Georgoff@trendmicro.com>
>
>>Guillermo,
>>
>>You maniac! According to my calculations, a 15mm fl pinhole would need to
>>be = .0065 inches. Can you actually produce holes that small by hand? I
>>have trouble breaking the 10 thousanths barrier
>
>Michael,
> I actually made a 0.0045" that at the end enlarged it to 0.0055"
>to
>use it in a 14mm focal length modified disposable 35mm camera (had trouble
>with vignetting when recessing the pinhole to be just 10mm from the film).
>
>It takes lots and lots of patience/time, but doable. And yes all my
>pinholes are made by hand. If they are bigger than 0.018" I start them by
>drilling a hole smaller than the intended diameter and then continue by
>hand
>with a needle.
>
>Guillermo
>
>
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Received on Mon Apr 23 16:59:33 2001