I have 40 years worth of negatives and slides, most "snapshots" but some early-amateur 35 mm efforts in B&W. Lots of family pictures I want to preserve (like me with hair!). What is the best scanning resolution (dpi) for digitizing these photos? What is the best way to pre-clean them before scanning? Lens wipe? Compressed air? While I'm here, what is a reasonably-priced scanner for this purpose? The scanner won't be used a whole lot after I've completed my project. (My HP 2575 scanner/copier/printer did not come with a slide/film adapter.) I could go with a dedicated film/slide scanner or a flatbed that is capable of scanning at the recommended resolution. Thanks!