Originally posted by drewdlephone The Sky (1A) filter is MOST useful. I'm noticing that a lot of my shots, even without cloud cover, have a blue tinge on Ektar 100. I'm tempted to leave the 1A on all the time because of this. Are there any other outdoor color-correcting filters that are good to have?
The blue colour cast changes with weather conditions. So in theory and for film production, you'ld take a reading with a colour meter and then place the matching colour correcting filter(s) (CC series) in front of your lens. In practice with a standard colour negative film this is completely unnecessary. Colour negs will be printed and the outcome of the colour on print is extremely dependend on the printer's set-up and the operator's personal perception.
If the Skylight filter gives good results for you, leave it on. I never used it except under heavily overcast conditions, because it would then add some warmth to otherwise too cool images.
Originally posted by drewdlephone The UV (0) filters don't correct color cast, right? They only correct for UV rays... which would have me believe that sometimes it's useful to use both a UV and Sky?
No, no need for an additional UV filter, the Sky serves that purpose too.
Originally posted by drewdlephone Then, you go inside and everything changes. I know I need a tungsten filter for working inside under ambient lighting. Is there anything else useful for indoor photography?
Besides blue correction filters (Wratten 85 or the like) in many instances a fluorescent correction filter is handy - though again: if the printer is competent, the flourescent colour cast can be removed at the printing stage –. In most cases the FL-D or CCM30 - colour correction Magenta 30- (for daylight fluorescent bulbs) is best, sometimes a FL-W is better suited.
In sports arenas and other public places in the outdoors you will more often encounter mercury or sodium pressure bulbs, the last giving the heavy yellow tint. This is hard to correct as these lights have a strong line emission and there will always be some kind of residual colour cast. But for mercury lamps the FL-D should work on negative film and for sodium a heavy blue filter could be useful.
Originally posted by drewdlephone Now, I know that you could just throw all your images into Photoshop and auto-white-balance out the problems (which is what I've had to do with my first roll of Ektar) but I feel this kind of defeats the whole point of going analog, and it also presents the issue that if I correct my photos, I then have to use the corrected digital copies, and the negatives become useless at that point for enlargements and reprints, because you'll get different results back.
You are completely on the right road, if you try to correct at the imaging stage. If you don't correct with filters in certain situations, your film will simply record different hues in a tonality different from a standard daylight shot. This can be used to enhance a certain mood, but it can also be quite disturbing, as for example some blues and greens can be indistinguishable if photographed under tungsten light. No Photoshop will recoiver colours and hues and tones, that were not recorded on film!
Ben