The FAU is definitely better then the HP adaptor, I've just tried it with some dark 50mm slides and the faces with the HP are unrecognisable, whilst the FAU is great. However
Dear Customer,Which, seeing as the built-in light is 6x8cm, is a bit of a blow. I'm going to have a go at stitching them together and see how that works. The trouble is the physical containers for the slides are the same size as 35mm ones so I they're having to be fitted at a slope, unless I use some markers on the glass. That means two scans per image plus stitching.
Thank you for your recent enquiry regarding your Canon product
In response to your query please be advised that the CanoScan 3200F will scan only 35mm negatives and slides, unfortunately it is not possible to turn the film lapmp manually.
Thank you in advance
Canon Support Centre
Gah and it still screws up the sizes.
One of the problems is that it's doing a lot of post-processing on its own as part of the 'film' mode that I don't have access to, so I can't even go out and buy a flat light because either I'll still be limited to the size of the scan, or not get the same effect.
I wonder how much a proper slide scanner costs?