Don Cole Posted October 9, 2019 Share Posted October 9, 2019 I've used a Sekonic light meter a few years ago in college when I had access to rent it and a 16mm Bolex. I just bought my very own Bolex and need a light meter, but don't want to have to spend another $100 or so to buy a Sekonic on ebay. I was hoping there would be an light meter app I could use instead, at least for now, but they all seem to be only for still photography. Does anyone know a good movie film light meter app I can use with my Bolex? Link to comment Share on other sites More sharing options...
Bruce Greene Posted October 9, 2019 Share Posted October 9, 2019 It's easy to use a still photography light meter for motion pictures. One just needs to know the ISO setting and the actual shutter speed that you will be employing. I believe the Bolex shutter speed at 24fps is 1/65th sec. But one must also increase exposure to compensate for the viewing prism/mirror and that means one should set the shutter to 1/80th sec on your light meter. Link to comment Share on other sites More sharing options...
Don Cole Posted November 24, 2019 Author Share Posted November 24, 2019 On 10/9/2019 at 2:23 PM, Bruce Greene said: It's easy to use a still photography light meter for motion pictures. One just needs to know the ISO setting and the actual shutter speed that you will be employing. I believe the Bolex shutter speed at 24fps is 1/65th sec. But one must also increase exposure to compensate for the viewing prism/mirror and that means one should set the shutter to 1/80th sec on your light meter. Okay, thank you! But how does that change if I change the frame rate like to 32 or 64 fps? I can't seem to find anything about that online. Link to comment Share on other sites More sharing options...
Mark Dunn Posted November 24, 2019 Share Posted November 24, 2019 Just work out the new shutter speed by taking the setting for 24 and multiplying it by 32/24 or 64/24. Link to comment Share on other sites More sharing options...
Bruce Greene Posted November 24, 2019 Share Posted November 24, 2019 Well the viewing mirror is a fixed 1/3 stop adjustment approximately. 32 fps is about 1/3 stop faster than 24fps. So, add 2/3 stop less exposure for shooting at 32fps, which is about 1/100th sec shutter speed equivalent. 64fps is about 1 + 1/3 stop less light, plus the viewing mirror loss so about 1 + 2/3 stop light loss vs 1/65th sec when shooting 64fps. Which comes out to about 1/200th sec exposure on your light meter. So, you see, the jr. high school math does come in handy in photography! Link to comment Share on other sites More sharing options...
Gregg MacPherson Posted November 24, 2019 Share Posted November 24, 2019 The sekonic studio delux is a great old analogue incident meter, dirt cheap on ebay. Link to comment Share on other sites More sharing options...
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