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Originally Posted by Don Hoey
This got me thinking. I seem to recall Hamma or Kaiser making a hotshoe mounted spirit level. A quick check on Wh/E site shows that someone still does. They have a 2 axis level so I would guess they are quite widely available.
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This is no good though unless the camera is tripod mounted.
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How to correct in Photoshop will be of interest to those who use fluid heads, as these are limited to 2 axis movement, and getting level horizons is more problematical.
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I would say that if you have PS or any other decent editing prog, knowing how to correct sloping horizons, converging verticals etc is an essential must know skill, and one of the more basic skills needed by the digital photographer.
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But this begs a question. I am sure that in my earlier readings in Jpeg v RAW that rotating jpegs in 90 degree increments is lossless but not so for any in between rotation. Cannot find the link to that info now.
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I'm not sure this is the case in PS, however if you find this of concern you could always convert to TIFF first.