Mathew Collins Posted May 11, 2019 Share Posted May 11, 2019 Hi, A question about lighting ratio, Key+Fill : Fill, Key is 100 FC, Fill is 100, then lighting ratio is 2:1 Key is 200 FC, Fill is 100 FC then lighting ratio is 3:1 Key is 400 FC, Fill is 100 FC then lighting ratio is 5:1 Key is 800 FC, Fill is 100 FC then lighting ratio is 9:1 Key is 1600 FC, Fill is 100 FC then lighting ratio is 17:1 Something wrong with my calculation? Is it possible to arrive at 4:1, 6:1, 7:1, 8:1 ratios? Thanks, Mathew Collins. Link to comment Share on other sites More sharing options...
Robin R Probyn Posted May 11, 2019 Share Posted May 11, 2019 I have always thought it was ratio of key to fill.. not key + fill to fill... ? could be wrong.. Link to comment Share on other sites More sharing options...
Frank Hegyi Posted May 11, 2019 Share Posted May 11, 2019 Yup, you're making it too complicated. It's just key to fill (as far as I've always understood it). Key 100FC : Fill 100FC = 1:1 Ratio Key 200FC : Fill 100FC = 2:1 Ratio and so on. Link to comment Share on other sites More sharing options...
Mathew Collins Posted May 12, 2019 Author Share Posted May 12, 2019 (edited) My understanding was Contrast/ Lighting Ratio is, key + fill : fill. Some of the books gives the ratio as , Ex: Set Lighting Technician's Handbook, Fourth Edition Film Lighting Equipment by Harry C. Box-page 112 key + fill : fill -Mathew Collins. Edited May 12, 2019 by Mathew Collins Link to comment Share on other sites More sharing options...
Robin R Probyn Posted May 12, 2019 Share Posted May 12, 2019 At the end of the day I wouldn't be too worried about any formulas.. a lot of those books are very outdated by todays standards / technical advancements / tastes in lighting ... I mean you don't have too use any fill .. I almost never do.. how it looks to your eye is alot more important .. Link to comment Share on other sites More sharing options...
Premium Member Mark Kenfield Posted May 12, 2019 Premium Member Share Posted May 12, 2019 8 hours ago, Mathew Collins said: My understanding was Contrast/ Lighting Ratio is, key + fill : fill. Some of the books gives the ratio as , Ex: Set Lighting Technician's Handbook, Fourth Edition Film Lighting Equipment by Harry C. Box-page 112 key + fill : fill -Mathew Collins. Interesting. I can't say that method makes an awful lot of sense to me. I've always understood and expressed ratios in stops. So at a 2:1 ratio, the key would be 1 stop higher than the fill. At 4:1 it would be 3 stops higher etc. etc. Link to comment Share on other sites More sharing options...
Bruce Greene Posted May 12, 2019 Share Posted May 12, 2019 I think you can use what ever formula you like as long as you are consistent. I assume that this will be for your own use and learning only. Just curious, what goal do you have for making these notes of lighting ratios? I suppose they might be useful if one wants to recreate a lighting setup at a later date. But, for matching lighting from different camera angles, I don't think it will be very useful, as from my personal experience, it's the "perceived" match that matters, and not an exact match. For example, a very wide shot might have a bit higher lighting ratio than a close up that needs to cut from the wide shot. Link to comment Share on other sites More sharing options...
Mathew Collins Posted May 15, 2019 Author Share Posted May 15, 2019 Thank you all. That clears lot of questions. I was confused about key + fill : fill which is given in many books. Now I could go with Key: Fill . -Mathew Collins Link to comment Share on other sites More sharing options...
Robin R Probyn Posted May 16, 2019 Share Posted May 16, 2019 Just go with what looks best.. you don't have to follow any set manual .. or ratio.. many are very old fashioned "you should do this when you shoot this" ratio,s... very often you don't need any fill or a tiny bounce.. your better off reading up about some of the DP,s who dont follow any rules.. like Roger Deakins.. technical knowledge is of course important.. but "how to light manuals "..from donkeys years ago.. chuck them.. ? 1 Link to comment Share on other sites More sharing options...
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