Thanks Julian. I'll take a look to your stuff and will get back. Regards, Alex Z
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Julian Robinson Sent: Friday, April 26, 2002 3:46 AM To: [EMAIL PROTECTED] Subject: [filmscanners] Re: Nikon LS4000 Depth of field At 02:00 26/04/02, Alex Z wrote: >I wonder whether the IV ED also suffers from this problem since I suspect it >has almost the same hardware (except of the sensor). >In fact, I remember noticing uneven sharpness descending near slide mount >edges, but wasn't sure this is scanner's fault or the slide has been exposed >that way (didn't have time to check the original under the loupe or play >with manual focus point adjustment then) Yes AFAIK all Nikon scanners are the same - must be Nikon's design choice to use relatively large aperture lens, perhaps to make up for lower light output from LEDs? I don't know why they don't make the lens variable aperture, since they seem to have at least 2 stops of extra light (or exposure anyway, maybe it is partly extra exposure time) available using analogue gain control. Why not stop the lens down 2 stops and use max analog gain for normal exposure operations? Then you'd get a significant increase in Depth of Field and greatly reduce the unsharpness problems at edges and corners. If you want to check your scanner, I describe an easy way on http://members.austarmetro.com.au/~julian/photography/ls2000-focus.htm I'd be interested to hear your results on a couple of typical negs/slides, and also interested if you have trouble with the complexity of my instructions. I've had one person tell me they couldn't understand it, but a number seem to have found it useful so I am wondering if I need to re-word it. Julian ---------------------------------------------------------------------------- ------------ Unsubscribe by mail to [EMAIL PROTECTED], with 'unsubscribe filmscanners' or 'unsubscribe filmscanners_digest' (as appropriate) in the message title or body ---------------------------------------------------------------------------------------- Unsubscribe by mail to [EMAIL PROTECTED], with 'unsubscribe filmscanners' or 'unsubscribe filmscanners_digest' (as appropriate) in the message title or body
