Focus and Exposure help need
Posted 02 September 2006 - 01:37 PM
I am a digital shooter moving over to the film world. I just bought a cp16. Its been tuned up and ready for work. I've shot a sample music video to familairize myself with the film process and immediately I realized that I need help in a few areas: Focusing (meaning, keeping a moving subject in focus with a telephoto lens 12-75), Exposure Knowledge(At which F-Stop the camera should be when using a certain speed film when lit with a certain kind of light, I.E sunny, night time, or indoor artificial light).
Of course, the first thing I did was buy some books, but you guys can explain it in a way any man can understand it.
On film sets I've seen people measuring the talent's distance from the camera lens. Is this to ensure an accurate focus?
I've also noticed during filming that, it was hard to tell if I had a sharp focus in certain low light levels. Is this why they measure?
Can anyone put a film speed beside these lighting situations
indoor dance club bright color lights:
indoor room regular artifical light:
outoor: afternoon 12pm.
outdoor 7pm golden hour:
nightime bright street ligths carlight:
Much help is needed.
Posted 02 September 2006 - 09:31 PM
Yes some viewfinders get really dim when the lens is stoped down, rendering focusing difficult. You can open the lens completely to focus, or you can take a measurement. In dim light you're probably wide open anyway, so you have to measure.
I don't completely understand your last question. If you're asking what will the exposure be under those conditions, it's very difficult to say. You need to invest in a good light meter and go from there. Film is too expensive not to use a light meter. Outdoors you can probably use the sunny 16 rule, but there is no reason to play guessgames.
So get a light meter, figure out the camera's shutter angle, input that and the film speed in to it, and that will give you the aperure. Check the archives for meter reccomendations, and read all those books you got.
Posted 02 September 2006 - 09:35 PM
The guys you saw measuring distances were the 1st ACs/Focuspullers. It's our job, within other things, to keep the chosen subject in focus by turning the lens barrel. Have a look at your lens. It should show distance marks.
A usual filmspeed used outside during daytime would be 50ASA, during nighttime 500ASA. Indoors it depends heavily how you light. Get a lightmeter and take readings in everyday situations to get a feeling for that.
Posted 03 September 2006 - 12:15 AM
If you are using a zoom lens, it is possible to zoom all the way in and get eye-focus marks for the different positions that the actor will be moving, but often with shorter primes or when you are just measuring the empty space where an actor will end up standing, you need to use a tape measure -- especially if you have a hard time judging focus in the viewfinder.
Posted 03 September 2006 - 09:44 PM
Posted 04 September 2006 - 10:42 AM