alain_martinez Posted January 30, 2007 Share Posted January 30, 2007 Hello, For a while now I've noticed that when I'm shooting a wedding every time I shoothorizontal/landscape the exposure is great, but if I shoot the same exactpicture but turn it vertically the picture ends up under-exposed by at least 1full stop. I shoot with a 5D and a 580 flash with one of those Fong'slightspheres attached on the flash. I thought I was not tightening the flashenough to the hot shoe, but last time I squeezed it so hard I almost couldn'tloosen it up after, and still the same thing happen. I experience this withTime Priority, and the Flash on ETTL My assistant photographer who shoots with the same equipment as me experiencesthe same thing. Has anybody else experienced this? Thanks in advance. Link to comment Share on other sites More sharing options...
Matt Laur Posted January 30, 2007 Share Posted January 30, 2007 Perhaps the different orientation is changing the amount of ceiling-reflected light you're getting on the subject(s)? You don't indicate if you're setting exposure manually or not. Link to comment Share on other sites More sharing options...
mike_barrett2 Posted January 30, 2007 Share Posted January 30, 2007 It is your ettl that is being affected. Watch where you are metering from. I recommend spot metering and focusing using the center point, focus on the face for most people. The face on most average complected caucasians is around 18% gray. Mike Link to comment Share on other sites More sharing options...
picturesque Posted January 30, 2007 Share Posted January 30, 2007 First do a test without the flash, then with the flash without the LS, then with the LS. That should isolate the problem. Most probably, the changing subject/scene changes the exposure because the exposure is based on matrix metering of the scene, for both ambient and flash metering, although I don't think the focus point weights as heavily as Mike says above. Link to comment Share on other sites More sharing options...
michaelging Posted January 30, 2007 Share Posted January 30, 2007 Meters in cameras are more sensitive in some areas of the viewfinder than others. This is the camera thinking for you. When you are taking a horizontal photos you usually have the sky in the top half of the frame and the camera meters accordingly.When you turn the camera on its side this does not work.The 5D like the 1DmkIIn that I use can tell if the camera is being held vert or horiz, so you would think the camera would know the difference. Link to comment Share on other sites More sharing options...
alain_martinez Posted January 30, 2007 Author Share Posted January 30, 2007 I always have my camera to use only the center spot for focousing and then recompose the shot. I have the camera's metering mode on (.), and a lot of the time I use Time Priority. The cealing hieight can't be the issue, because remember a lot of times that this has happened to me has been on the same moment/place, just different orientation. I'm wondering if there's wear and tear on the flash since it needs to be rotated with the Light Sphere when shooting vertical. I'll try to isolate the issue like you suggested by adding a component at a time. Thank you Link to comment Share on other sites More sharing options...
timcorridan Posted January 30, 2007 Share Posted January 30, 2007 focus and recompose can be the wrong thing to do... Link to comment Share on other sites More sharing options...
timcorridan Posted January 30, 2007 Share Posted January 30, 2007 i hate to elaberate scince i'm not a digital (5d) user. perhaps others could Link to comment Share on other sites More sharing options...
conraderb Posted January 30, 2007 Share Posted January 30, 2007 alain - it isn't clear if you mean this happens when you are shooting in all conditions or if only flash. I would encourage you to shoot in manual mode so you have total control over what is going on. otherwise, going from horizontal to vertical with a bright light source nearby can throw off your meter if it is in one frame but not the other. Link to comment Share on other sites More sharing options...
primeimages Posted January 30, 2007 Share Posted January 30, 2007 If you're not using one of those Stroboframes with the camera flip, perhaps its the orientation of position of your speedlight. I've noticed this before I got one of those Stroboframes that keep your speedlight on the vertical position....not counting those nasty shadows. Link to comment Share on other sites More sharing options...
ptucci Posted January 31, 2007 Share Posted January 31, 2007 You're supposed to turn the flash 90 degrees (while keeping it straight up). In other words, have the Canon logo pointing to your right while shooting landscape. Then , when you want to shoot in portrait mode, tilt the camera, and tilt the flash head so it still points at the ceiling. The LS doesn't send light out equally in all directions. Watch the DVD that came with it. Link to comment Share on other sites More sharing options...
karl_borowski Posted February 1, 2007 Share Posted February 1, 2007 Just avoid this problem by buying an adjustable flash bracket that'll rotate to keep the camera over top of the camera when taking shots vertically. This is one of the reasons I love Mamiya RBs so much: you can rotate the film back to reorient it to take vertical pictures instead of having to take the time and trouble of reorienting the whole camera. Link to comment Share on other sites More sharing options...
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