Testing Film Stocks & Filtration
Posted 21 June 2010 - 01:34 PM
I'm getting down in the trenches I guess in working with film and I wanted to try and get a better understanding of the relationships between various film stocks and filters. I've shot a couple projects using mostly Kodak 7219 and some 7205. I understand basic color conversion filters like the 85 & 80A and NDs, but where I get lost is the "other" filters. So I want to do some simple tests with the Kodak 7219 and 7207 stocks and various filters. Any recommendations on what types of filters I should test? Which types of filters would I find handy on most sets? What types produce specialized effects? Is there any protocol I should follow in the actual testing? Thanks in advance!
Posted 21 June 2010 - 01:41 PM
I would also test out against varying types of skin and makeup-- though that is getting a little bit specific. I find the filters I use most on set, aside from the typical CCs are diffusion.
Also see if you can test 'em out on film as well as on some HD cameras, as I'd say on the HD/DCinema beasts that's where you'll use 'em the most.
Also, test them out at different ratios, 2:1 4:1 etc.
Posted 21 June 2010 - 01:49 PM
Posted 21 June 2010 - 09:45 PM
Also, one more question...would filters have any type of noticable variant effect due to distance from the lens? Like would a twist on filter respond differently to one placed in a matte box? Might sound silly, but it popped in my head.
Posted 22 June 2010 - 02:57 AM
Another thing to look into as well with diffusion filters is how they effect objects at varying differences and shot sizes for the grade (e.g. 1/4 v 1/2 v 1 ). Perhaps do something like 50mm @5ft/10ft/30ft (move person back) , then Wide shot/Mid Shot/Close Shot (move camera). Repeat for a few lenses you tend to go towards a lot (in my case it's be an 18mm, 35mm (maybe a 50.. depending on the day), and 75mm, for 35mm (9.5/16/50 for S16mm).)