They need to be in the adapter and the scanner needs to be programed to accept the adapter for it to work.
If you just laid slides on the bed of a regular scanner it will not work.
How good of a scan do you want, will determine how much you want to spend. If you get the slides scanned professionally it could cost you up to $1 each.
This is a 40+ year old slide scanned on a $100 scanner.
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