Re: Pinhole and SLR

[George L Smyth <GLSmyth@xxxxxxx>]

Wayde Allen wrote:
> 
> On Fri, 30 May 1997, Joe Berenbaum wrote:
> 
> > altering the bellows extension -efffectively a zoom. Thus a way to assess
> > the angle of view other than a single fixed finder (and other than by
> > looking at the extremely dark ground glass), would be useful.
> 
> Following on the heels of my last post, I was just thinking that one could
> likely get an estimate of the field of view from the angle formed by two
> lines drawn from opposite corners of the negative, and intersecting at the
> pinhole.  If you extend these lines through the pinhole, the resulting
> angle should be the maximum field of view recordable by the film (I
> think).

This is correct.  This is why I use a string shaped like a "V" with the
point above the pinhole and the ends to the edges of the film.  Looking
down the line of the string will show you what is included.

george

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