Firstly, excuse my ignorance if there's already various threads on here about this.. i have read pat VII of the B&W tutorial thingy. I just bought Cokin filters today. I use B&W film (HP5 and FP4) so i bought the following filters and as far as i've figured out the exposure corrections are listed next to them: P.001 Yellow. (1 stop) P.003 Red. (3 stops) P.197 Skylight? (came with the basic holder kit). (1 stop) P.121 ND Grad. (1/3 stop to 2 stops) I've done a quick test with my camera on aperture priority and it does work the correct exposure compensation according to the exposure increase factor required for each filter used. I thought it would have difficulty exposing using the Red filter but it appears to get it ok. No filter: F4@1/250. Red: F4@1/30. Yellow: F4@1/180. Skylight?: F4@125. ND Grad: 1/2 way down = F4@1/45. 1/3 way down = F4@1/90. Red & ND Grad 1/2way down: F4@1/6. Appears to me the camera has exposed correctly here?. My question is, is it ok to allow the camera to expose itself or should i take a reading with no filters and use Exposure Compensation to add the extra amount of Stops required? I'm guessing it's best to expose for the subject with filters off first, take the reading, add filters and compensate accordingly? I'm just thinking it would be difficult to expose for a certain part of the sky, or a certain subject if the filter were on? Sorry for the beginner questions but i just want to make sure before i shoot more film. Thanks, Kev.