Re: [Cameramakers] Re: Enlarger Diffusion.
On Sun, 2 Dec 2001 [EMAIL PROTECTED] wrote: Hmmm. I've been fighting this fight, too. One problem is that if your diff material isn't absolutely creamy smooth, you have to space it quite a ways behind the neg to ensure that any graininess is entirely out of foucus. I can't seem to find milk-white, smooth diff material available by itself. ...snip... One success i've had on a small scale is actually a piece of white shopping bag plastic. Based on your comments and success with whith shopping bag plastic, it might be worth checking out white Plexiglass. This is the same stuff used for making light boxes, and is readily available from plastic supply houses. Another possibility would be frosted drafting mylar. The frosted mylar is what Howard Bond has been using for his unsharp masking, and more recently for dodging and burning masks mounted just above the negative. In any case, heat is something to be concerned about. A piece of heat absorbing glass between the lamp and the diffuser may be in order? By the way, all, the 4x5 SLR is almost done. Does anybody have any suggestions for posting pictures? You can't post pictures to the mailing list. You CAN send them to me directly and I'll put them on the RMP cameramakers web site at http://rmp.opusis.com so that people can see them. - Wayde ([EMAIL PROTECTED]) -- ISART 2002 International Symposium on Advanced Radio Technology http://www.its.bldrdoc.gov/meetings/art/index.html -- ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
Re: [Cameramakers] Re: Enlarger Diffusion.
At 03:01 PM 12/3/01 -0700, you wrote: On Sun, 2 Dec 2001 [EMAIL PROTECTED] wrote: Hmmm. I've been fighting this fight, too. One problem is that if your diff material isn't absolutely creamy smooth, you have to space it quite a ways behind the neg to ensure that any graininess is entirely out of foucus. I can't seem to find milk-white, smooth diff material available by itself. ...snip... One success i've had on a small scale is actually a piece of white shopping bag plastic. Based on your comments and success with whith shopping bag plastic, it might be worth checking out white Plexiglass. This is the same stuff used for making light boxes, and is readily available from plastic supply houses. Another possibility would be frosted drafting mylar. The frosted mylar is what Howard Bond has been using for his unsharp masking, and more recently for dodging and burning masks mounted just above the negative. In any case, heat is something to be concerned about. A piece of heat absorbing glass between the lamp and the diffuser may be in order? FYI, Howard B. uses a sheet of 3/16 in. milk white plex AND the mylar to do Alan Ross dodging masks. He is presently experimenting with different thickness of the plex. Go to any outdoor, illuminated sign company and beg for scraps if you don't have a plex supply house near you. AZ Maker of Lookaround panoramic camera. www.geocities.com/soho/gallery/8874/ or keyword.com lookaround ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Re: Enlarger Diffusion.
Hmmm. I've been fighting this fight, too. One problem is that if your diff material isn't absolutely creamy smooth, you have to space it quite a ways behind the neg to ensure that any graininess is entirely out of foucus. I can't seem to find milk-white, smooth diff material available by itself. I've called lighting shops, tried internet searches, toured home-depot. The big stores have flourescent fixtures with large white smooth panels, but you have to buy the fixture at say $50-$100. I suppose I could contact the maufacturer of one of these. I once tried some plastic from a not-quite-clear plastic kitchen cutting board (as opposed to the white ones.) Sanded it smooth. Melted it in the enlarger. Orbital sanding plexiglass works okay, but if you sand out to 1000 grit, for instance, the glass is essentially clear again. Stick to 200-400 and space it behind the neg, and this works pretty well. One success i've had on a small scale is actually a piece of white shopping bag plastic. The really thin, crinkly stuff, stretched tight. I think the bag came from Ames. You need a couple layers, spaced to cancel any non-uniformity. Ground glass is probably the only thing that will stand up to the kind of heat your head must generate. Two layers spaced an inch apart would probably give you all the difuusion and mixing you could want. but they'd have to be an inch or two behind the neg, which means the surface has to be larger than 8x10. Is this thing horizontal or vertical? By the way, all, the 4x5 SLR is almost done. Does anybody have any suggestions for posting pictures? Roger Stevens ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
