jstewart
Member
Folks,
I recently began using a color head with halogen light source.. previously I'd been using a cold lite head.
With the halogen source, I notice there's a significant amount of time that the lite takes to completely "die out".. maybe half a second or so.
This is interfering with my practice for translating test strips to final exposures. My test strips are done like this: I cover a segment of paper and expose it.. then trip the switch on the timer to cease the exposure. Then I move the mask and turn the timer back on to expose a wider strip.. etc for 4-5 strips over a 30 second or so total exposure to the first strip. This means that all the strips actually get measureable additional exposure due solely to the ramping of the halogen lite, with the greatest effect on the first few strips.
I think it makes a difference because my draft print, exposed with the best looking test strip, looks very different than the test strip I used to estimate the exposure.
I guess I could remove the effect of the ramping by using a card to obstruct the light path at the designated time, but I was wondering if others have already dealt with this problem, and how.
Thanks in advance.
Jim
I recently began using a color head with halogen light source.. previously I'd been using a cold lite head.
With the halogen source, I notice there's a significant amount of time that the lite takes to completely "die out".. maybe half a second or so.
This is interfering with my practice for translating test strips to final exposures. My test strips are done like this: I cover a segment of paper and expose it.. then trip the switch on the timer to cease the exposure. Then I move the mask and turn the timer back on to expose a wider strip.. etc for 4-5 strips over a 30 second or so total exposure to the first strip. This means that all the strips actually get measureable additional exposure due solely to the ramping of the halogen lite, with the greatest effect on the first few strips.
I think it makes a difference because my draft print, exposed with the best looking test strip, looks very different than the test strip I used to estimate the exposure.
I guess I could remove the effect of the ramping by using a card to obstruct the light path at the designated time, but I was wondering if others have already dealt with this problem, and how.
Thanks in advance.
Jim