Thanks guys, I just did a try with the 400 aluminum oxyde and I'm quite impressed with the result,I've compare it to a few ground glass I have and the grain seem just fine. I've tested the diffusion with my lightmeter and it tested about the same as the ground glass on my hasselblad so I guess it will do just fine.
Thanks to you guys I know got a 50$ that I can spend elsewhere! Robert Mtl, Quebec P.S. I also tried the 240 grit but the grain seem a bit big, nonetheless I kept it as an emergency replacement, or for special focusing need with large grain!!!!!!! Two ground glass for 6$ total it sure ain't bad! On 12/19/01 5:00 PM, "Marv Soloff" <[EMAIL PROTECTED]> wrote: > Robert Mayrand wrote: >> >> I've been all around town trying to find the right grit. Knowing that some >> of you recommended carbodorum grit 600, I went to a jeweler who just happen >> to be an amateur of astronomy who built and polish his own lens. So he sent >> me to a few astronomy shop where you buy telescope and they all seem to have >> this in stock or at least know about this, unfortunately they did'nt have >> any carbodorum at the time.....but that's another source for sure. >> >> The only thing I found for now is aluminum oxide but someone told me that >> this is not rated the same way, anyway I bought a small quantity of each >> grade they had in stock 80 240 & 400 but I don't know if this would do....so >> I ask for help before ruining another glass! Some people told me that it's >> easier to work with carbodorum because it stay on the glass longer....but >> another one told me that it's a lot coarsier than aluminum and gives a less >> uniform finish.......any comment would be appreciated. >> >> Thanks >> >> Robert >> Mtl, Quebec >> >> _______________________________________________ >> Cameramakers mailing list >> [EMAIL PROTECTED] >> http://rmp.opusis.com/mailman/listinfo/cameramakers > > I do think you are gilding the lily. Try this: obtain some glass cut to > size (this can be from your friendly glass shop or from picture frames - > I get mine at garage sales). Go to your local auto parts emporium and > get a tube of valve grinding compound. Squirt some between two pieces of > glass, and with a circular motion rub the top sheet of glass over the > bottom sheet of glass. Make sure you get complete coverage. If the > valve grinding compound starts to dry out, clean off both plates of > glass and squirt in some more compound. Rub for about 10 minutes, wash > off the glass and see if it is "ground" to your satisfaction. If not, > do some more. > > If you need grids or scribe line, lay them in with India ink. > > Regards, > > Marv > _______________________________________________ > Cameramakers mailing list > [EMAIL PROTECTED] > http://rmp.opusis.com/mailman/listinfo/cameramakers _______________________________________________ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
