Sure I can explain this, I already have as a matter of fact. What you are talking about below is the ABILITY to focus accurately, not the ease at which you could do it. Like I said earlier, the wider lenses take more concentration, more time to achieve a confident result, are easier to make a mistake if you are not careful etc. That doesn't mean you cant focus them accurately, it just means they are HARDER to focus accurately than longer lenses at the same f-stop. And the quick A/B comparison is a valid consideration if your trying to see the differences I am talking about. That's why the zoom example is nearly perfect as you can very quickly see the differences, as compared to changing primes and its associated delay between the comparison. jco
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Shel Belinkoff Sent: Thursday, November 16, 2006 10:22 AM To: Pentax-Discuss Mail List Subject: Re: Using a Super Tak w/ istDS- A challange to the list? Hmmm .... another comment that has slipped through my filter. OK, I can't let this pass as, iirc, JCO made this comment several times: > > J. C. O'Connell wrote: > > 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. I don't understand what the "time difference" has to do with anything. This isn't like audio testing where a quick A-B comparison may be helpful. Here we can use two lenses, take a picture with each one, or several pictures, and in a matter of seconds put them up side-by-side to compare the results. This is photography, so actually looking at the results is a very simple thing, and whether we look at those results immediately or a year later, the images will be the same. Further, the results can be viewed at any magnification - up to 1600% in Photoshop and to almost an unlimited degree of enlargement when making prints, so it's very easy to see just how well each lens focused on a given subject. Would you please take a moment to explain why changing prime lenses and the time difference you mention should be considered a factor? Shel -- 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
