Karl Beath
15-Nov-2001, 12:47
Hello from Karl
I have a 2nd hand Durst Laborator 1200 previous to this,I used a Durst colour he ad M670. With my previous enlarger I had exposure times, to use a specific exam ple, of 2min 40 at f16. Now I have exposure times of 12min at f16, for the same neg. The bulb is a 150W, it has a white covering. Could the bulb be old theref ore giving out less light than the previous bulb.
Secondly, on my column there is a graduation in inches and centimetres. There a re also graduations which I assume allow for exposure increase calculations with increasing height of the column. Invers square law. The problem is, I don't k now how to use them. Please could someone assist me.
Cheers and thanks Karl
I have a 2nd hand Durst Laborator 1200 previous to this,I used a Durst colour he ad M670. With my previous enlarger I had exposure times, to use a specific exam ple, of 2min 40 at f16. Now I have exposure times of 12min at f16, for the same neg. The bulb is a 150W, it has a white covering. Could the bulb be old theref ore giving out less light than the previous bulb.
Secondly, on my column there is a graduation in inches and centimetres. There a re also graduations which I assume allow for exposure increase calculations with increasing height of the column. Invers square law. The problem is, I don't k now how to use them. Please could someone assist me.
Cheers and thanks Karl