09-29-2014, 10:49 AM
Hi Frank
As others said, it's difficult to give an explanation - there are too many variables involved. The EV in the shots may be different (the camera may not have exposed as set), the film may be miss-processed, on top of that the scans may have been done at different settings or processed differently. No surprise the results are inconsistent. Although to be honest the 1/1000 shoot does indeed look like there was something wrong. The dark parts appear washed out - since this is a negative it might mean the scanner did not recover sufficient detail in the bright areas of the film. Or it might just be that the scanner used a wrong black point setting.
If you want to eliminate all these variables you need to look at the negatives. With a digital camera, take two digital shots of the two negatives, at _exactly_ the same exposure settings (use manual exposure without metering) and post the results here. The two film frames shot at f/4x1/100 and f/5.6x1/500 should look identical. If they don't then there was a problem either with the camera or the film processing.
P.S. Do your cameras have vertical or horizontal shutters?
As others said, it's difficult to give an explanation - there are too many variables involved. The EV in the shots may be different (the camera may not have exposed as set), the film may be miss-processed, on top of that the scans may have been done at different settings or processed differently. No surprise the results are inconsistent. Although to be honest the 1/1000 shoot does indeed look like there was something wrong. The dark parts appear washed out - since this is a negative it might mean the scanner did not recover sufficient detail in the bright areas of the film. Or it might just be that the scanner used a wrong black point setting.
If you want to eliminate all these variables you need to look at the negatives. With a digital camera, take two digital shots of the two negatives, at _exactly_ the same exposure settings (use manual exposure without metering) and post the results here. The two film frames shot at f/4x1/100 and f/5.6x1/500 should look identical. If they don't then there was a problem either with the camera or the film processing.
P.S. Do your cameras have vertical or horizontal shutters?