Today I was shooting indoor soccer with a rented 200mm F2 on my 800. After about 100 shots there were a series of shots in which the shutter speed varied from 1250 down to 50. I checked the images and the aperture and ISO did not change. The aperture was set to F2.
I eventually switched to M mode and set the exp to 400. After that the exp was ok. Has anyone seen a similar problem? I checked to make sure bracketing was off.
Sun 02-Feb-14 09:45 AM | edited Sun 02-Feb-14 07:11 PM by SheriB
If you were shooting indoors, I would hazzard a guess that as the action moved, your lighting conditions changed, which would make your shutter speed change. In aperture mode, with a set ISO, the speed is the only thing left for the camera to adjust. What metering mode were you using? And did you think you had Auto ISO set? What ISO were the images shot in? Were the uniforms one dark team, one light team? If more dark uniforms in a shot, the camera needs to slow shutter to expose correctly,a shot with more light uniforms will equal faster shutter speed. Also if the shot was taken directly under a light fixture as opposed to between lights, it would change the amount of available light. If you posted an image at the high and low end of the shutter speed range you mentioned, with exif intact, we might be able to see more. Also I do not understand what you mean set the exposure to 400
"....and set the exp to 400. After that the exp was ok. "
When I say I set the exposure... I meant that I switched to manual mode and set the shutter speed to 1/400 and kept aperture and ISO the same. So, manual exposure worked ok but A mode behaved erratically.
Part of the problem may be that you're shooting using Spot metering. If in one shot, the metering spot was over something pale (such as the wall in background) and in another it was over something dark, it's easily possible to get the sort of variation in exposure that you are seeing (about 4.5 stops in these two examples).
When you switched to Manual Exposure, obviously the meter was no longer controlling the exposure, so your results were consistent.
Sun 02-Feb-14 09:31 PM | edited Sun 02-Feb-14 09:31 PM by ajdooley
Bingo, Brian! That white wall is how many stops lighter than the black trunks? I almost always shoot sports by making a few test shots, checking the results (a great luxury of digital photography) and the settling on a manual shutter/f-stop combination. That way backgrounds don't overly influence my shots.
I had the same problem shooting with my D800e in Yellowstone last week. The camera was set for Aperture priority and matrix metering and one shot would be at the correct exposure of 1/500s, the next at 1/125s, another at 1/4s, and all of exactly the same scene. Fortunately I had my D7100 along for backup and switched over to it for the remainder of the trip.
Do you know how to setup bracketing to get a 1/500s and a 1/8s exposure in a series? That is a difference of 6 EV which I cannot do with my D800e camera?
With bracketing there would be one shot underexposed and one stop at the metered reading and then a shot that is overexposed. This is not at all what I described as occurring while shooting. Try reading the Nikon manual.
I was shooting for over an hour when the problem started to arise and no changes were made in my camera settings other than the ISO setting depending upon the scene and cloud cover at the time.
I am not wishing to get into an argument with you as I was only asking the question! But yes I know how to get 6EV spread in bracketing. a 7F 1.0 should do it. When you say "try reading the Nikon manual" I have and I use bracketing a lot. I was just aware of the fact that the bracket button is right beside the ISO button and other people have had that problem in the past. if it was not bracketing I would suggest your camera is broken.