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Subject

Author

Date

Re: JandC 400

Jorge Gasteazoro.

18:46 13 Jan 07

Re: JandC 400

Miles

5:19 14 Jan 07

Quantity of light to expose the film

Philippe du Busquiel

1:28 8 Jan 07

Hello,

How much EV from the enlarger do I need to do the testing of a 100 ISO film ?

I have read in an recent article by Jorge Gasteazoro that we need 4 EVs of light from the enlarger to expose a 100 ISO film. I made an incident measurement under the light of my enlarger (Durst L1200 with a color head) with the dome diffuser on my lightmeter. I can not get so much light even at 5.6 ! For 100 ISO I only get 2 - 3 EVs at the most. Is there anything wrong in my procedure ?

Another point: if I use my enlarger for projection of a 4x5 step tablet on a 4x5 film sheet I go much beyond the 1:1 ratio. At the minimum height of the enlarger head I cover an 8 x 10 inch. Is exposure by contact not a better way for this purpose ?

Thanks for your help.

Best regards,

Philippe