I see. Well, that would indeed bother me, especially if delivered by dedicated film scanner. Now I wonder if similar baning has been reported also on images from the Reflecta RPS 7200 Professional.
If I insert this particular negative into the film holder upside down, scan the same frame of film, and then rotate the image 180 degrees in Photoshop in order to get it the correct way up once again, as you might expect, this banding is present on the opposite side of the frame. Obviously, if the image to be scanned is more 'busy', the banding will, in most cases, be hidden.
Just to be clear, the example I sent is a fairly dense negative, with a fairly plain area of sky in the location of the banding. I have other examples of scans containing plain areas of sky where the banding is less of an issue, as that particular negative is not as dense. What I'm trying to say is that the severity will appear better or worse, depending of the density of the film and how uniformly-toned any plainer areas are in the image, in the location of where banding will present itself. Anyone who has a large volume of film to be scanned will, no doubt, have some images which are likely to show the problem to the kind of degree as in the example I've sent.
Also, let me point out that this problem was much less noticable when using the supplied Cyberview software (the image I sent was scanned using the Silverfast software). The ProScan 7200, when used with the Silverfast software, is clearly able to scan with noticably superior image quality than when using the supplied Cyberview software, but it seems to be less forgiving of the scanner having these kinds of problems in the first place. I have heard it said that the Silverfast software attempts to squeeze the maximum amount of image quality out of scans, but I presume in doing so, it places more demands on the scanner functioning without any issues of this kind in the first place.
As you have probably gathered from my original post, I am very fond of this scanner but I would be buying a scanner to scan, to a high quality, any of my images I want to scan - not just images which happen to be busier, or less dense, or images which do not contain large amounts of more uniformly-toned areas, such as sky! Is that too much to ask? I think not.