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本帖最后由 yellowS15 于 2010-7-26 15:40 编辑
I've not got Canon 50D so i might be wrong.
But normally for long exposure pictures, if you have turned on LENR (Long Exposure Noise Reduction), the camera will take one more shot straight after with the same exposure time but with the shutter closed.
The reason is to try recreate the sensor noise created by the long exposure and deduct it from the original shot.
So for your 45 mins shot, you need to wait another 45 mins for the camera to do another reference shot and another 10-20 seconds or so to do the actual noise reduction calculation ... on a Nikon DSLR, you normally see "NR" (stands for Noise Reduction) on the screen while the camera is doing this, i'm guessing your 50D is doing the same as well just with different message on the screen.
That's why film SLR is still quite popular for people who like doing super long exposure |
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