Only one we could find for sale that promised to scan the 120 and 620 size negatives we had

Having difficulty figuring out how to scan the odd-sized slides/transparencies, but it's very nice that I can scan more than one slide at a time now

A secondary problem is that the software cannot properly 'size' the slides, and ends up cropping one or more edges of the slides.

I'm surprised they don't have a sort of generic holder for odd size negatives

Scanning large negative film sizes worked by just laying the negative on the glass bed underneath the negative rectangular opening, 3.25"X10.5", that appears after you remove the document mat

multiple size negatives and slides I want to scan

I had to re-scan to 2400 dpi to get a manageable size

The negative sizes it supports is limited.