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Omega D2 Enlarger Question
I have two questions about Light Multiplier/Mixing Chambers for the Omega
D2 4x5 Enlarger. First of all, there are three types of mixing chambers available according to negative format: 4x5, 6x6 and 35mm. If my aim were to use all three formats, must I have a separate mixing chamber for each, or would a larger mixing chamber also cover the smaller formats (i.e., 4x5 covers all three formats)? "Common sense" tells me that the 4x5 mixing chamber would work just as well for all three, since it provides a suitable area of illumination for all three. But does common sense break down in this scenario? Second question: The diffusing "lense" in the mixing chamber seems to be nothing more than a square piece of white, translucent plastic. In the old enlarger I'm trying to restore, the plastic appears to be a bit shiny and slightly more "clear" in the center, which leads me to believe that it would create a "hot spot" in a 4x5 print. If I must replace this part, could you suggest an economical source? Would frosted glass do better? Thanks, Trad ----== Posted via Newsfeed.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeed.com The #1 Newsgroup Service in the World! 100,000 Newsgroups ---= 19 East/West-Coast Specialized Servers - Total Privacy via Encryption =--- |
#2
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Omega D2 Enlarger Question
T R wrote:
I have two questions about Light Multiplier/Mixing Chambers for the Omega D2 4x5 Enlarger. First of all, there are three types of mixing chambers available according to negative format: 4x5, 6x6 and 35mm. If my aim were to use all three formats, must I have a separate mixing chamber for each, or would a larger mixing chamber also cover the smaller formats (i.e., 4x5 covers all three formats)? "Common sense" tells me that the 4x5 mixing chamber would work just as well for all three, since it provides a suitable area of illumination for all three. But does common sense break down in this scenario? The bigger light box will spread out the light more. This will mean longer print times with smaller formats. Having said that I use a 4x5 box on my Durst enlarger with all formats. I'm sure if I had the smaller light boxes I would get quicker times but it hasn't bothered me yet. One way to think about it is that the 4x5 box isn't for 4x5 it's for all formats bigger then 6x6 and up to 4x5. The 6x6 fills the gap to 35mm. So clearly you can use the light box with formats other then the one on the label. Second question: The diffusing "lense" in the mixing chamber seems to be nothing more than a square piece of white, translucent plastic. In the old enlarger I'm trying to restore, the plastic appears to be a bit shiny and slightly more "clear" in the center, which leads me to believe that it would create a "hot spot" in a 4x5 print. If I must replace this part, could you suggest an economical source? Would frosted glass do better? Not sure where you're located but you could try: http://www.khbphotografix.com/ Nick |
#3
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Omega D2 Enlarger Question
In article ,
T R wrote: I have two questions about Light Multiplier/Mixing Chambers for the Omega D2 4x5 Enlarger. "D" Dichroic II, should have a DB &DD mix chamber, The DD is for 4x5 The DB is for smaller formats as it adds about a 1stop increase for brighter focus and shorter exposure times. The DD however works fine for smaller formats, the DB will not work for 4x5. Second question: The diffusing "lense" in the mixing chamber seems to be nothing more than a square piece of white, translucent plastic. In the old enlarger I'm trying to restore, the plastic appears to be a bit shiny and slightly more "clear" in the center, which leads me to believe that it would create a "hot spot" in a 4x5 print. If I must replace this part, could you suggest an economical source? Would frosted glass do better? The part should be available through Omega, I would not use other parts as their are alot of issues I have seen result from users improvising on this particular item. To contact Omega: 800-777-6634 or www.omegasatter.com -- LF website http://members.bellatlantic.net/~gblank |
#4
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Omega D2 Enlarger Question
If my aim were to use all three
formats, must I have a separate mixing chamber for each, No or would a larger mixing chamber also cover the smaller formats (i.e., 4x5 covers all three formats)? Yes Second question: The diffusing "lense" in the mixing chamber seems to be nothing more than a square piece of white, translucent plastic. If you are speaking about the color head (Super Chromega D Dichroic II) the D-D mixing chamber is discribed as having an infrfa red filter and UV absorbing difuser. I would not change these. You may want to replace them but not change them. Thanks, Trad Hope I could help. _________________ Ready, Fire, AIM. Bruce Brooklyn, N.Y. |
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