If you're adjusting the finder lens (diopter), don't use an image through the lens on the camera. Use instead the lines on the focusing screen. There may be a considerable difference.
Modern focusing screens transmit more light directly than the ground-glass screens of yore, for the sake of a brighter image--but less accurate manual focusing. Rick http://photo.net/photos/RickW --- On Tue, 12/15/09, Boris Liberman <[email protected]> wrote: > From: Boris Liberman <[email protected]> > Subject: Re: From: John Francis > To: "Pentax-Discuss Mail List" <[email protected]> > Date: Tuesday, December 15, 2009, 1:30 PM > On 12/15/2009 8:11 PM, John Francis > wrote: > > Well, in the world where the laws of physics and > optics apply, that > > is nothing to do with the diopter. If there is a > sharp image on the > > focussing screen, but not at the same point as on the > film/sensor plane, > > that's caused by a problem with the placement of the > focussing screen. > > > > All the diopter does is to make it easier for your > eyes to focus on the > > image on the viewfinder screen. A poorly > adjusted diopter can make it > > impossible for you to see *anything* in focus, but it > can't make part > > of the image on the focussing screen appear sharper > than it really is. > > Since my eyesight slowly but surely deteriorates I suppose > it would make no harm for me to take a sharp lens, say FA 43 > or FA 77 and auto-focus it on something easy, say, a target > recommended by Larry. Then I will see if my diopter is set > properly. > > Boris > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link > directly above and follow the directions. > -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
