I am migrating my write-ups to Medium https://medium.com/@vladstesttarget . Seems, blog form factor is not really suitable as product support site - not even as F.A.Q. So I invite everyone to come to my pages on Medium - they are never going to be hidden behind paywall so you don't have register with Medium if you don't want to. I will host two publications: https://medium.com/film2digital-f-a-q and https://medium.com/on-film-scanning anyone can join me and contribute if you inclined so. I also start publishing articles on LinkedIn @ https://www.linkedin.com/in/vserebryany , but that's mostly the nod to Google linking and SEO. Negative Lab Pro, worth the investment? https://medium.com/on-film-scanning/negative-lab-pro-vlads-test-target-e0234f401370   Gears and Precision: The Mechanics of Film Scanning https://medium.com/on-film-scanning/film-scanning-digitizing-vlads-test-target-d8625c1c03af Zen and the Art of Camera Scanning or The Brief History of Vlads Test Target