This may sound a bit odd, and I am not even sure I am asking the question correctly - but here it goes. As I learn to get better scans (from my very middling equipment, Epson V600, Canon 6D and Panasonic G9 in highrez mode, both with a micro nikkor 55mm f/3.5, an Elmarit-R 60, and a Tamron 90 Macro) - I realize it might be useful to play with a really really good sample of a 6x6 B&W negative - and the few negs I developed myself are, well, kind of not that great.
Is it possible to buy test negatives somewhere? Say, some generic image, well exposed, well processed film, possibly some Fuji, Kodak, etc, developed in a couple of different developers?
I know I can get better at exposing and processing, but getting started with scanning/capturing using very high quality negs would be great!
tx for any suggestions,
Mike