Hello: Someone here gave an interesting suggestion regarding having a grid lamp made up that was blue.
I don't remember what that was a solution for, but it sounds like it's worth exploring for my big monochromatic lens. I have conflicting wavelength info I will clarify first. What needs to be resolved is whether the light source used was 436 nm mercury-xenon, or 560 (actually double line at I think 544 and 577 nm +/-). The first is blue/violet; the second I think is greenish. Assuming I get the right info, I am curious what will be the effect on contrast of using a narrow spectrum light source in an enlarger. Also, I read a white paper that came from the Schneider Optics site about lens resolution vs. contrast. This was mostly related in terms of spatial frequency which is a step further toward abstraction and a step further away from understanding what it means. It sounds like high resolution lenses have low contrast and vice versa; one design choice among many. Now, whether this means the same thing as the topic of comparing contrast between coated and uncoated lenses. I saw someone's opinion that single coated was more pleasing than multi-coating when dealing with shadows (???). Can someone explain the visual effect of these concepts? Meanwhile, I'm exploring light sources...also have to look at Huw's LED enlarger using mega-LED's (Luxeon?). It appears that the 436 nm Hg-Xe lamps have a huge amount of UV, too. There are smaller ones up to 200 W that don't require forced air cooling - just ugly power supply requirements. Murray Thanks --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.391 / Virus Database: 222 - Release Date: 9/19/02 _______________________________________________ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
