I recently aquired a Polaroid 405 holder from the wonderful eBay. I stocked up on some Fuji FP-100C and FP-100B (the 3.25x4.25 BW and Color). I mostly got it for quick proofs and exposure checks for some color I'm shooting now. So now I have some technical questions! I've been doing quite a bit of longer exposures, some even as long as 30 seconds. I've mostly ironed out the reciprocity failure issues with the lovely help of the Fuji website. But how do instant films respond to different lighting conditions? Are color casts from light as prominent as with film? And is the rated speed for instant films pretty accurate? I shoot 160VC at 100, and FP4 at 80. Basically, this is new and it's an overload of ASA ordeals! Can anyone point me in the right direction, or give some advice from personal experience?