Hi, As a beginner to 4X5, I have tried B/W [Agfa APX]and color transparency {Fugi Velvia & Velvia 100F and E100VS]. My Sekonic 508 is used for exposure readings. The B/W exposure seems to come out okay, but color trans. is terrible. Generally under exposed. What am I missing? I meter for the high lights as I would in 35mm and 120. I have dropped from f45 back to f32 or f22 and still get under exposure. Perplexed. Bob