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"RE: Help with Long Exposure Shot"
Looking at the EXIF data for the D3100 shots, as Neil suggests, should definitely help to solve this.You don't say specifically but it's assumed that you are using manual exposure M in both cases?Is it possible that your cable release behaves differently on the 2 cameras as follows:D3100 - cable release triggers camera which calculates and uses correct shutter speed, despite you locking the release?D7100 - cable release triggers camera and now lock position actually does lock shutter open for 30-40 seconds, hence the overexposure?Colin
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