Reciprocity and Intermittency failure in enlarging paper.

[Nicholas Lindan]

There is a new application note on reciprocity and intermittency effects in photographic paper on the Darkroom Automation web site support page.

The results of tests with Ilford MGIV show no reciprocity or intermittency failure.

 

[Mick Fagan]

Nicholas, interesting reading, one question though. How is the timer adjusted so you can allow a 50-millisecond warm-up time, for the enlarging globe?

The possibility of allowing extra time for the globe to warm-up, has never occurred to me before. I just took it for granted, one had to allow a fraction of a stop using guestimation and experience.

Mick.

 

[Nicholas Lindan]

How is the timer adjusted so you can allow a 50-millisecond warm-up time for the enlarging globe?

http://www.darkroomautomation.com/support/AppNotePH212LampDelay.pdf

 

[Mick Fagan]

Very interesting, thank you.

Mick.