User login

exposure time

Posted on Mon, 11 Jul 2005 at 19:40



Can anyone tell me how long to expose a 62 line photograph (image size is 7x10 inches) on 355 yellow mesh I'm using a 10,000 watt light. Any Help would be greatly appreciated.

dan

Location of Opportunity or Item

Comments

Anonymous says: Hi Dan, Each emulsion has a different exposure, sorry there is no turn key answer. The image size doesn't matter, measure the size of the frame from corner to corner and that number is the distance for ...

Hi Dan,
Each emulsion has a different exposure, sorry there is no turn key answer. The image size doesn't matter, measure the size of the frame from corner to corner and that number is the distance for the lamp to the glass. Now that you have the distance, use a exposure calculator to set the proper exposure. Do the exposure test on a line color screen, even though it's over exposed usually it's still useable for a run.
Follow the directions on the calculator, look for good resolution in the image and little color difference between the emulsion exposed behind the filter and not filtered.
A 10K lamp is strong, it's going to be lightning fast if the emulsion is SBQ ( approx 20 units to start with on the calculator) on a dual cure ( approx. 300 units to start with on the calculator)
Hope this helps.
Ken Ferguson

posted on: Sun, 07/17/2005 - 9:23am

Did you enjoy this article? Click here to subscribe to the magazine.