RE: Pinhole and SLR

[Wayde Allen <allen@xxxxxxxxxxxxxxxx>]

On Thu, 29 May 1997, Wayde Allen wrote:

>    D=0.047 * sqrt(f)
> 
> where:  D is the pinhole diameter in millimeters
> 
>         f is the focal length in millimeters 
> 
> Assuming a 40mm spacing from the film plane to the pinhole, the optimum
> pinhole size as about 0.03mm.

OOOPS...should be 0.3mm (2.97E-1)!

> a hole much smaller than 0.2mm which will significantly degrade
> resolution.

Looks like a 0.2mm hole is OK with an optimum hole size of 0.3mm.  In
fact, this would be too small of a hole.  Hand drilling the hole to 0.3mm
will be tough enough I imagine.

I think the rest of the original post is correct, but I'd recommend
checking the math for yourself.  I scribbled this out pretty quick. 

- - Wayde
  (allen@xxxxxxxxxxxxxxxx)


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