Thanks Tom, I'll go look at some. It'll give something to do till I get rid of this wretched Cold turned Flu!
Don > -----Original Message----- > From: graywolf [mailto:[EMAIL PROTECTED] > Sent: Monday, August 16, 2004 12:56 PM > To: [EMAIL PROTECTED] > Subject: Re: New Project, Need Help! > > > The focal-length of a pinhole is equal to the distance from the > film plane. The > f-stop is equal to the focal-length divided by the diameter of > the pinhole. If > the hole is too big, the image is too defused to use. Too small > and you do not > get enough light. There is an optimum size for a given > focal-length, but I do > not remember what that is, and don't care enough to look it up. > However, I would > be very surprised if there are not several pinhole photography > sites brought up > with a google search. Freestyle photo, BTW, has at least 3 > different pinhole > cameras listed in their catalog. > > -- > > Don Sanderson wrote: > > Blast you sir! Now you've gone and done it! > > You went and made me actually start thinking. <ouch> > > I was just practicing to be stand-by comic relief for the next > time Frank > > gets miffed at us. ;-) > > > > OK. I'll bite, how *does* one decide how far from the film > plane the pinhole > > in a pinhole camera should be? > > Does it just depend on the size of the image you want, or, > (Caution, worlds > > dumbest question follows) > > is there actually some kind of "focal length" to a pinhole? > > I'm trying to picture light rays thru a small hole. > > I would assume the size of the pinhole itself is what > determines COC size, > > and that no actual FL exists. > > > > OK, have at me. > > > -- > graywolf > http://graywolfphoto.com/graywolf.html > >
