I'm shooting a scene on Eterna Vivid 500T 16mm film in a fairly dark bar.
Unfortunately I don't have the budget for tests at the location, but I've been there to take some readings. However, my light meter only performs incident readings.
At ASA500 25frames, my incident reading is about 0.7 - obviously I'm going to need more light (my lens opens to 2.8), and I'll be bringing some redheads along- that isn't a huge issue.
However, I'm wondering about the importance of spot metering and whether or not it'll help me much better. There's a few prac lamps and hotter areas in the frame, and, while at 0.7 incident reading, I'm sure these spots would be much brighter, perhaps at 4 or 5.6.
So, judging from my incident reading of 0.7, if I exposed at 2.8, theoretically the whole picture would be underexposed 3 stops right? And that's getting a bit risky for the latitude of 16mm, potentially having a crushed black image? But, if I were to have a spot meter, and had readings around 4/5.6 for the prac lamps in shot, would that mean they are 1/2 stops over, and will hence be exposed correctly, while the blacks are quite underexposed?
So, correct me if I'm wrong, a scene with an incident reading at 0.7, shot at 2.8, will be quite underexposed and crushed, while the lamps and highlights in shot will be correctly exposed, leaving me with an almost crushed black image with small white spots throughout ?
Sorry for the confusion, essentially I'm just wondering if I'm metering correctly (without using a spot meter), and if I'm understanding the spot meter correctly.