Posted 10 October 2012 - 08:07 PM
Posted 10 October 2012 - 09:45 PM
Hi everyone, filters are a little confusing to me, when do you use them? When do you use ND's? 85? polarizers? And what do they do the frame? Any help would be greatly appreciated, thank you.
Filters don't really affect the frame unless they are out of place. Different filters have different uses...too many to list here, but...
Neutral density (ND) filters are used to cut down on the amount of light you have entering the iris. For example, if you are shooting outside in direct sunlight and the light meter says you have to stop down to f/22, you would want to put an ND in front of the lens.
An ND .3 = 1 stop
An ND .6 = 2 stops
An ND .9 = 3 stops
So if you put an ND .6 in front of the lens, you would open up the iris to f/11 to compensate for the 2 stops.
The 85B filter is used to shoot tungsten film under daylight color temperatures (5500K.) Otherwise you wind up with a blue cast on the film. I think the 80A is used to shoot daylight film under tungsten light (3200K.)
Take a look at the Tiffen website or check out a few film books like Cinematography by Kris Malkiewicz. That might help, but usage is the best way to learn.
Posted 10 October 2012 - 10:01 PM
Then there are all the glorious diffusion filters which can take the edge off of HD imagery, halo point sources in your frame ect.
Point being there is a wide wide world of filters.
I'd recommend the book Image Control by Hirscheld to get a good intro to 'em-- with pictures!