I'm one of those who brought up the possibility before.(posted 8163 days ago)I haven't tried yet. I'm thinking about easy, cheap and relatively accurate way to get calibration scales (density steps). I prefer it be mountable on 4x5 or 6cm carrer. Ideally, two separate steps, one 0.1, 0.2, 0.3, ... and another 0.05, 0.15, 0.25, ... or something like that. This is because I want to make sure a couple of technical issues are not in my way for the first time.
Any idea? Please let me know...
(It's probably not hard to find sources but I have been working on other things lately...)