----- Original Message ----- From: "Christian" Subject: Re: Using a Super Tak w/ istDS- A challange to the list?
> Bill is using the "personal experience" argument. Conduct an > experiment > and evaluate the results. This is very different from the "personal > opinion" argument. Granted, Bill is evaluating his experience > subjectively and it is only based on his experience, but JCO made a > blanket statement that "ALL people can focus long lenses easier than > short lenses (at a given f-stop)." So the argument has turned into > one > or two people's experience that show otherwise and JCO's blanket > statement which, without his own evaluation (he doesn't need to prove > anything to us with experience), is just his opinion. I just noted an exception to the rule. I used to teach this stuff, I expect I am as well versed in optical and photographic theory as most anyone on this list. At no time have I said that the optical theory that John has presented is fallacious. I have said that I found that in one given set of circumstances, with one particular camera and two particular focal lengths of lenses that there is no practical difference in focusing difficulty. I did this by setting a 105mm lens to f/8, hitting the DOF preview and focusing it, then releasing the DOF and seeing if I could improve the focus. I then repeated the above with a 40mm lens, and noted that in both cases, the focus had been critically secured when stopped down. That it's suddenly become a battle for the idealogue of the list and his sycophant is really kind of sad. They need to get lives. William Robb -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
