View Full Version : White balance lens cap for Pre-Exposure
Lachlan 717
7-Jan-2010, 15:52
Has anyone tried one of these (see eBay listing 220535479121) digital white balance lens caps for pre-exposure?
I'm not sure how light tight the seal would be, but it might be worth a sheet or 2 to test.
D. Bryant
7-Jan-2010, 20:30
Has anyone tried one of these (see eBay listing 220535479121) digital white balance lens caps for pre-exposure?
I'm not sure how light tight the seal would be, but it might be worth a sheet or 2 to test.
I've not used one myself but have considered it also. I think it has interesting possibilities.
Don Bryant
Lachlan 717
7-Jan-2010, 21:00
I've not used one myself but have considered it also. I think it has interesting possibilities.
Don Bryant
I think that the seal could be a problem, but a strip of 3mm neoprene and some adhesive could make a light-tight sleave.
Also, I don't know if the circle of white is big enough to cover the whole image. No good if it vignettes.
Maybe kill 2 birds and glue one to a step-up ring, and then attach the neoprene?
Lynn Jones
11-Jan-2010, 13:43
I've tried several of these that didn't work including a couple that I made. The light source muse be very even. I finally ended up exposing out of focus grey cards in the studio and marking the holders. For certain applications I sometimes pre-expose wit colored filters, but that is another story.
Lynn
Lachlan 717
11-Jan-2010, 15:54
I've tried several of these that didn't work including a couple that I made. The light source muse be very even. I finally ended up exposing out of focus grey cards in the studio and marking the holders. For certain applications I sometimes pre-expose wit colored filters, but that is another story.
Lynn
Thanks for the info, Lynn.
What caused the lack of uniformity? Was it a light leak?
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