Hi meow
I agree with ksk - Negative Supply gear is excellent and your set-up looks pretty damn good - which only leaves the lens. You may simply have a rogue copy and as this is definitely not a bad lens, it’s worth having it checked out. I can understand how frustrating it must be as you have clearly done everything by the book to get things right. Kudos to you for that. it’s almost as frustrating for me as I can’t think of anything else that might help!
Scanner lenses are not available ‘over the counter’ but are often to be found on ebay - especially the Minolta and Nikon scanner lenses which come up for sale pretty regularly. You can also pick up a broken scanner sold ‘for parts only’ but make sure the canny seller hasn’t already removed the bit you want!
A multitude of beautifully machined adapters are available from RAFCAMERA https://rafcamera.com and if you describe what camera/lens/magnification you are working with, Rafael will be able to suggest the bits required.
There is also a lot of information on https://www.closeuphotography.com especially with regard to RAF adapters for the Minolta Dimage lens.
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