No, you're mistaken, I did mention that already in the thread. I not only stated "all else being equal a bunch of times, I also stated the zoom example ( focus on your subject at longest setting and then zoom to desired focal length- which is focusing at same distance), I also specifically stated focusing at the same DISTANCE too in one of the earlier posts. jco -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Lon Williamson Sent: Thursday, November 16, 2006 6:08 AM To: Pentax-Discuss Mail List Subject: Re: Using a Super Tak w/ istDS- A challange to the list?
If I keep the camera at a constant distance from the subject, I agree with you. But if the subject has the same magnifaction in the finder, I don't. You haven't mentioned that yet in this new diatribe. -Lon J. C. O'Connell wrote: > I never said it was always a "problem", I said its > harder to manually the wider you go. Secondly, it > doesn't matter whether its prime or zoom, > the difference is the same because its > DOF related and the DOF is the same for > for primes and zooms at the same focal > lengths. Lastly I use the zoom example > because its the easiest and fastest > way to make the comparison, changing > primes makes for a slow change and the > comparison is harder to make and more > error prone due to the time difference > between the comparisons. Its similar > to audio testing, its better if you > can compare back and forth instantly > rather than relying on memory well after > the first sampling. Its also a good > example because I believe everybody > knows its true. No one has posted otherwise > on the entire list. If there was no > difference between focussing difficulties > of a wide and a tele at the same aperture, > how can you account for the fact that > zooms are easier to focus at the long end? -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
