View Full Version : Exposure lock
Hi all, need some advice. Took some photos at Leeds castle on a wet sunday afternoon. I researched in the manual re exposure etc and read up on locking the exposure so both pictures would be equally exposed to faciliate the stitching together.
But if I look carefully I can just make out a very slight diagonal line from left to right in the midlle of the picture.
So what went wrong?
I have posted the photo in the gallery for anyone who wants to see it.
I must admit that I've never done any of these stitching panoramas so I'm not an expert by any means. I hadn't realised that they did them diagonally, I just thought they 'merged-in' somehow.
One thing comes to mind - many lenses show vignetting where the edges of the frame are slightly darker than the centre so if you've merged the very edge of the left hand shot, say, with a more central part of the right hand shot this might be one cause. Have a look at the original files - just crop the overlap bit, temporarily, from each shot, then compare them side by side to see if they have the same density.
Also, have a look at the exif data for each shot to make sure that the camera did indeed give identical exposures
Isn't locking the exposure normally designed so that you can expose for one particular area and then re-aim at something else. Therefore doesn't the exposure lock - automatically unlock - once you press the shutter.
Presumably to get constant exposure over 2 shots of different areas you should set ISO, shutter and apeture manually and then nothing can change?
Hi Nigel Iknow what you mean but I looked at the manual and it definitley says To hold down the AE-L button to either change the composition or tkae several shotswith the same settings.
I guess I will have to try again.
Adey, I made sure I overlapped at leat 20% on each shot so the stich assist would have enough info to give a good match.
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