Dont you guys know the definition of a zoom lens? Its a lens that does not change focus as you change the focal length. Yes there are plenty of el crapo zoom lenses out there that dont hold focus ( or improperly aligned good ones ), but I know for a fact that many DO hold focus throughout the zoom range and focus range BECAUSE I own them and always check that immediately on acquistion of the lenses in question. I dont buy or keep any zoom lenses that have any perceivable focus shift as it really slows you down if you have to keep refocussing every time you change the focal length, and a lens that doesnt hold focus during zooming may be indicative of other optical problems too. jco
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Mark Roberts Sent: Saturday, November 11, 2006 12:32 PM To: Pentax-Discuss Mail List Subject: Re: Using a Super Tak w/ istDS- A challange to the list? Paul Stenquist wrote: >On Nov 10, 2006, at 4:44 PM, J. C. O'Connell wrote: >> the camera makers >> themselves even tell you to focus at longest >> setting and then zoom to length you want >> because its easier to focus accurately at >> longer lengths > >This is not a good way to work. Most lenses aren't precise enough to >hold accurate focus while zooming. The "focus at longest focal length and zoom out" technique comes from motion picture shooting, where it isn't usually any more precise than with still photography, but is the only practical way to work when you're zooming *during* during a shot... Unless you have the budget to hire a separate crew member as focus puller, and I've never worked in film environments that were that classy! ;-) -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
