andrew_luke2 Posted September 12, 2007 Share Posted September 12, 2007 So I shot 4 rolls of fuji 800z the other day using 4 500w halogen lamps. I used several different light setups with totally different positions and directions of light (ie some with all 4 direct, some with umbrella, some bounced of ceiling, etc). I also was using a hoya 80A filter to bring the colors back to daylight and factored the extra stop in by metering at 400 with the sekonic. I shot all manual as I always do with metering on my sekonic L-358 set on incident. I double checked some of these with the on camera spot meter on my f100 and they were within a fifth of a stop pretty much every time. all 4 rolls I got back were underexposed identically about a full stop. no matter the lighting conditions or room i was in, they were all the same. is there something I missed about this? the meter is dead on in daylight as I shot several rolls of 120 on my hasselblad a month ago and the exposure was perfect. I'm kinda pissed because now I have to scan them and see if I can salvage many. the model loved like half the shots and I've got nothing unless the one roll of 120 comes back ok. they were processed at a lab using C-41 if that makes a difference. I'm wondering if they didn't expose the film correctly. Link to comment Share on other sites More sharing options...
john tonai Posted September 12, 2007 Share Posted September 12, 2007 An 80A needs 2 stops compensation. Also, labs don't expose the film-you do. Link to comment Share on other sites More sharing options...
ericf1 Posted September 13, 2007 Share Posted September 13, 2007 John nailed it, but the good news is your meter remains spot on. Good luck. Link to comment Share on other sites More sharing options...
andrew_luke2 Posted September 14, 2007 Author Share Posted September 14, 2007 you know I looked into this yesterday and found the factor for the filter is an extra 1.5 stops, not the 1.0 I was told at the counter (that's what I get for listening to a salesman). I realize the exposure is in my control but the amount of time the film is left in the developer well change the exposure. Link to comment Share on other sites More sharing options...
john tonai Posted September 14, 2007 Share Posted September 14, 2007 Andrew, The compensation is 2 not 1.5. While with C41 that should make much difference, the person who told you that was also wrong. Also, developing affects the development. Exposure affects the exposure. Although under exposing and under developing both result in a thin negative, they are not the same thing. Link to comment Share on other sites More sharing options...
andrew_luke2 Posted September 15, 2007 Author Share Posted September 15, 2007 I understand now that I screwed up by not testing first. I just wasn't sure if it was possible the lab botched on accident. as far as 2 stops, the filter factor from hoya says 2.4. it's my understanding that that means 1.4 stops compensation. I may have that wrong too...I'm new to this balancing tungsten to daylight thing. I've mostly shot strobes and natural lighting in the past. I've honestly never used any filter except for UVs for protection. Link to comment Share on other sites More sharing options...
helenbach Posted September 15, 2007 Share Posted September 15, 2007 I've seen Hoya Optics data that suggests 1.5 stops for their version of the 80A, but I wouldn't use anything less than a 2 stop compensation. The Kodak data for a Wratten 80A suggests 2 stops. Best, Helen Link to comment Share on other sites More sharing options...
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