My guess would be auto exposure. The digital stiched photos are too
small for me to see the details but it's really noticeable in the OM
shot. You don't say which OM you were using so I can't say for certain
if it was auto exposure. If it wasn't that then my guess is that you
changed the exposure. My understanding is that when you're doing
stiching you want to keep your exposure the same for all the shots so
you'd want to use AE lock or switch to manual and use an exposure that
works reasonably well for all the shots.
On 10/19/05, Willie Wonka <alienspecimen@xxxxxxxxx> wrote:
> I need to have a mystery solved, so please, put on the combined OM thinking
> cap and generate some theories.
> It seems that I am having exposure problems and can't really figure out why.
> Look at this first image:
> http://pg.photos.yahoo.com/ph/alienspecimen/detail?.dir=1b68&.dnm=7ae6.jpg&.src=ph
> It consists of three exposures taken in order from right to left. I know
> that some of you can't see it well after resizing. It was ok on my monitor
> at home...
> I stitched the three images in PS. If you see the original file, there is a
> little difference where the first and the second image were blended, and it
> is more than obvious where the second and third image were blended (the right
> third of the cloud).
> Why my images get progressively darker? This was taken as one image and
> after the stitch, the previous one shoudav looked like it:
> http://pg.photos.yahoo.com/ph/alienspecimen/detail?.dir=1b68&.dnm=b068.jpg&.src=ph
> Both images were taken with the A200 and it was explained to me that the
> cause is the white ballance, which was on Auto (actually I think this is the
> very first image I took with this camera). I did believe this, but not
> anymore.
> Last night, I scanned some film. This is a composite of pictures taken with
> my OM1 on Fuji Superia 400. It was the last picture taken before I left
> Connecticut almost two years ago.
> I did not stitch the images, so the amount of overlap can be seen. The first
> image was the one on the left this time. Notice the pattern? The first
> image is well exposed, and the second darker. Same as before, but this time
> the difference is that in reality, I was going towards the lightsource, i.e.
> the right portion should have gotten progressively lighter as opposed to the
> first picture, where I started with the portion where the sun is and left the
> darkest portion of the sky for last.
> All I did was to turn the camera slightly to left or right, that's all. And
> in the case of the OM, I don't have WB. And yes, in both cases I kept
> constant aperture and shutter speed. As noted the only auto function was the
> WB with the A200.
> Anyone has scientific explanation?
> Thanks
> Boris
> P.S. Here is the OM image:
> http://pg.photos.yahoo.com/ph/alienspecimen/detail?.dir=1b68&.dnm=5f29.jpg&.src=ph
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