Luis Filipe Montanha Posted August 28, 2012 Share Posted August 28, 2012 Hi there everyone! It's possible for me to use a Neutral Density gel (rosco) in front of the lens? In our production, we have 3 glass ND's, from Schneider... but we need more to cut light in a scene with hard sunlight (we are working with Sony Nex-fs100, which have a native 800 ISO - it is hard to control in some situations). Can I loose quality in the final image? Thank you all! Best regards Link to comment Share on other sites More sharing options...
Lucas Griego Posted August 28, 2012 Share Posted August 28, 2012 Hi there everyone! It's possible for me to use a Neutral Density gel (rosco) in front of the lens? In our production, we have 3 glass ND's, from Schneider... but we need more to cut light in a scene with hard sunlight (we are working with Sony Nex-fs100, which have a native 800 ISO - it is hard to control in some situations). Can I loose quality in the final image? Thank you all! Best regards Yes you can. It takes some experimentation to get it to work and it's not without issues (eg. getting it flat and not losing image quality). But it can be done in a pinch if you can't get your hands on any other ND filters or make adjustments somewhere in the chain. Link to comment Share on other sites More sharing options...
John David Miller Posted August 28, 2012 Share Posted August 28, 2012 The gel material is like a dust magnet. Maybe you can attach it to an optical flat and sandwich it between a glass ND filter. Like a glass ND .3, Rosco ND 1.2, optic flat to give you a tasty ND Oreo. Keep the gel tight and exterior light off it. I believe you get problems with color shift after 4 stops of ND. At which point ND + IR is needed. I'm sure one of our ASC members could give more a detailed explanation. Link to comment Share on other sites More sharing options...
Stuart Brereton Posted August 28, 2012 Share Posted August 28, 2012 It is possible, but definitely not advisable. ND gel is very far from optically clear. Imperfections in the base of the gel, creases, fingerprints and dust can all impact on your image quality. If you've run out of ND, try using a polariser to cut another couple of stops. Link to comment Share on other sites More sharing options...
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