Originally posted by pingflood No, they do not. There's a reason height adjustable film holders are doing well, and that is due to flatbed scanners producing crappy results being off even by a tiny bit.
A few "pictures" are worth a few 1,000 words...
Use a flatbed scanner as a camera - Photo Galaxy
Don't make absolute statements if you don't have all of the facts. His scanner may well have no depth of field but that is no the case for all scanners. I have never had to worry about my negs being slightly cupped in the holder and his scanner, I believe, is a better model. Furthermore, the supplied neg holder for my scanner does not keep the negs flat to the glass.
Granted, some really low end scanners do have to have items right on the glass to get any reasonable results but I don't think this is the case here.
Do you have an Epson Perfection line scanner, pingflood?