Bob Hayes Posted February 17, 2006 Share Posted February 17, 2006 I was shooting with the Z1u over the weekend. Day exterior. Moving fast I put the expure on auto. The lighting was standard front lit. Auto expsure said on thing but the 70% iris said I should stop down a couple of stops. Why the discrepency. Link to comment Share on other sites More sharing options...
Premium Member Laurent Andrieux Posted February 17, 2006 Premium Member Share Posted February 17, 2006 Sorry I don' get this sentence perfectly due to my bad english knowledge Auto expsure said on thing but the 70% iris But I've read topics on french forums about such problems with this camera... Are you sure the zebras were set at 70 % ? They said on this forum that zebras should be set at 100 % on this camera. If someone set it to 100 % before you used it and you thought it was on 70 %... It might explain it ? Link to comment Share on other sites More sharing options...
Premium Member Tim J Durham Posted February 17, 2006 Premium Member Share Posted February 17, 2006 I was shooting with the Z1u over the weekend. Day exterior. Moving fast I put the expure on auto. The lighting was standard front lit. Auto expsure said on thing but the 70% iris said I should stop down a couple of stops. Why the discrepency. There may be a compensator which can adjust the auto-exposure up or down up to 2 stops (so if the AE thinks the scene should expose to f5.6, you can adjust it so if will expose that scene at f2.8 or f16 or somewhere in between). I have an XL-2 and it has that feature. The zebras don't have anything to do with the auto-exposure. They just tell you what in the frame is 70 IRE or above if you set them to 70. Link to comment Share on other sites More sharing options...
Premium Member Laurent Andrieux Posted February 17, 2006 Premium Member Share Posted February 17, 2006 The zebras don't have anything to do with the auto-exposure Sorry, I know they don't It's because of that sentence (that I didn't understand well) That I thought Bob might have been using them in appreciating his exposure and that they might have confused him, eventually... Auto expsure said on thing but the 70% iris Link to comment Share on other sites More sharing options...
Bob Hayes Posted February 17, 2006 Author Share Posted February 17, 2006 My English isn't so good either. I was setting th exposure using auto iris and it doesn't agree at all with Zebra settings. Link to comment Share on other sites More sharing options...
Premium Member Laurent Andrieux Posted February 18, 2006 Premium Member Share Posted February 18, 2006 That's what I figured out from your post (funny how about two bad english speakers can understand each other well ! :lol: ). So don't think it could have been set to 100 % instead of 70 %, that puzzling you ? Link to comment Share on other sites More sharing options...
Premium Member Tim J Durham Posted February 18, 2006 Premium Member Share Posted February 18, 2006 My English isn't so good either. I was setting th exposure using auto iris and it doesn't agree at all with Zebra settings. Were you checking it with a waveform monitor where the zebras were telling you 70 IRE and the waveform was telling you it was something else? Link to comment Share on other sites More sharing options...
Premium Member Laurent Andrieux Posted February 18, 2006 Premium Member Share Posted February 18, 2006 I was shooting with the Z1u over the weekend. Day exterior. Moving fast I put the expure on auto. I guess he certainly was ! :lol: :lol: :lol: Link to comment Share on other sites More sharing options...
Lucita Jones Posted April 14, 2006 Share Posted April 14, 2006 I became aware of the same discrepancy today as I was trying to figure ot me camera`s ASA. I imagined that the autoexposure would give me a reading which at the same time would present zebra at 70IRE. But the autoexposure reading was about one stop darker than the reading with zebra. What I want is to use a lightmeter (on reflected mode) and to be able to determine how many foot lamberts my camera needs for any given subject to register 70IRE at a predetermined T stop. I want to use a lightmeter in order to work apart from the camera and the LCD. However, I want to set my lights according to the IRE of the image. I am thinking of lighting to 70IRE and then checking if at 100IRE I get zebra stripes and then reduce light levels as required. Please if anyone has a similar method, I'd appreciate your advice. Thanks LJ Link to comment Share on other sites More sharing options...
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