EssexAsh: i look forward to the independent tests that will really tell us what the dpi is.
Dpis wise the V800 and V850 is the same as V700 and 750. However lifespan can be expected to be longer due to the LED light source. The new 120 and 4x5" film-holders are useless unless you do this mod [ http://www.stockholmviews.com/epson_v850/epsonV850tweaks.html ] the matter of productivity of V750 vs V850 can be discussed but with the V850 you will get two sets of film-holders. The dual set of holders make it possible to fiddle the filmstrips for the next batch scan in place while the first scans is performed that will better the workflow in some degree!
Maybe the most in depth review of the V850 so far!http://www.stockholmviews.com/epson_v850/Not a major leap forward from V700/V750 in scan quality but about 10% faster.
Filters for Sigma 8-16mm an overview:http://www.stockholmviews.com/sigma_8-16/sigma-8-16mm-filters.html
Great lens and finally I have found a way to adapt filters to the Sigma 8-16mm lens!http://www.stockholmviews.com/sigma_8-16/sigma-8-16mm-filters.html