You should get full coverage of a 6x6 negative with the focal length you mentioned. I'd agree that the problem is most likely physical obstruction.----- Original Message ----- From: "Fox, Robert" <r...@aarp.org> To: <pinhole-discussion@p at ???????> Sent: Tuesday, November 12, 2002 2:04 PM Subject: RE: [pinhole-discussion] Question on image circle and medium format pinhole camera design
> Thanks Phil! It's clearly the first scenario -- the corners are perfectly > clean and black. I suppose I will need to modify the camera some more to get > rid of that slight edge that sticks up. > > Much appreciated, > R.J. > > -----Original Message----- > From: Philip willarney [mailto:pwillar...@yahoo.com] > Sent: Tuesday, November 12, 2002 3:00 PM > To: pinhole-discussion@p at ??????? > Subject: Re: [pinhole-discussion] Question on image circle and medium > format pinhole camera design > > > --- "Fox, Robert" <r...@aarp.org> wrote: > ..snip.. > > Question: my images are all circular, cutting off > > the corners cleanly of > > the square print. Is this because the image circle > > is too small for the > > film? I'm wondering if the circular edge of the > > front plate is being picked > > up on film, since the edge sticks up about 1/4 inch. > > If the edges of the photos are sharp, hard edges, it's > probably vignetting -- something in the light path > from the outside world to the film is blocking the > light. So you're getting a nice clean photo of the > edges of the lens holder, for instance. > > If the edge is a slow fade from picture to dim picture > to black, then it's falloff. Pinholes as such don't > have an image coverage circle -- the edges just get > dimmer and dimmer as they get farther from the pinhole > and get less & less light. > > I think. Any quibbles, anyone? > > -- pwillar...@yahoo.com > > > __________________________________________________ > Do you Yahoo!? > U2 on LAUNCH - Exclusive greatest hits videos > http://launch.yahoo.com/u2 > > _______________________________________________ > Post to the list as PLAIN TEXT only - no HTML > Pinhole-Discussion mailing list > Pinhole-Discussion@p at ??????? > unsubscribe or change your account at > http://www.???????/discussion/ > > _______________________________________________ > Post to the list as PLAIN TEXT only - no HTML > Pinhole-Discussion mailing list > Pinhole-Discussion@p at ??????? > unsubscribe or change your account at > http://www.???????/discussion/ > >
