J. Wayde Allen wrote: > > On Tue, 22 Oct 2002, Kenith Ryan wrote: > > > I have noticed that some people make the ground glass for their > > cameras wit the corners cut out while others leave the corners in. As > > I understand it, the corners are cut off to make it easier to tell if > > there is any vignetting. I don't see how this works. It seems to me > > that if the corners are there you would be able to look at the image > > on the glass to look for vignetting. Without the corners how do you > > look for this? > > You can look through the cut out corners of the ground glass to see if you > can see light through the lens. It can be difficult to see vignetting on > the ground glass, especially when the ground glass image isn't very > bright. > > > Also, I am having trouble finding a suplier for the abrasives to make > > the ground glass. I have found a few on the internet, but they have a > > minimum order for $25 or more. Since the abrasive is only about $3-$4 > > per pound I hate to pay this much since a pound would be more than > > enough for my needs. > > Some ideas ... most hardware stores have grinding compounds and/or can > order it. How about an automotive store? I'd guess that valve grinding > compound would work? > > - Wayde > ([EMAIL PROTECTED]) > > _______________________________________________ > Cameramakers mailing list > [EMAIL PROTECTED] > http://rmp.opusis.com/mailman/listinfo/cameramakers
Valve grinding compound works very well in making ground glass. And, making it yourself, you can make it any size you want, when you want. If you can find it, 400 grit grinding compound (for telescope making) also works well. Regards, Marv _______________________________________________ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
