mathbias
TPF Noob!
- Joined
- Nov 28, 2021
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- 67
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I am wondering how bad it is (when it too cold or wet to get the shot outside) to shoot through a window that isn't terribly clean. More importantly what would I look at when I examine the result on a computer that would tell me how much worse the image is as a result of the window?
I've only had a lens with an f2.8 widest aperture for a short time. Experimenting with that lens, I lined up a shot with a small obstacle a very short distance away blocking part of a very distant object that I focussed on. The small object was entirely missing from the image. It was so out of focus that it vanished entirely and blocked no part of the distant object. That gave me the idea that with a wide aperture and a fairly distant subject and a dirty window closer than the lens even could focus, each spec of dirt might distribute so well over the image that it is just a tiny reduction in total brightness, rather than a more serious issue. In test photos I don't see evidence of the window (unlike results I would get with my older camera). But I'm not sure I'm evaluating the result correctly.
I've only had a lens with an f2.8 widest aperture for a short time. Experimenting with that lens, I lined up a shot with a small obstacle a very short distance away blocking part of a very distant object that I focussed on. The small object was entirely missing from the image. It was so out of focus that it vanished entirely and blocked no part of the distant object. That gave me the idea that with a wide aperture and a fairly distant subject and a dirty window closer than the lens even could focus, each spec of dirt might distribute so well over the image that it is just a tiny reduction in total brightness, rather than a more serious issue. In test photos I don't see evidence of the window (unlike results I would get with my older camera). But I'm not sure I'm evaluating the result correctly.