I've read here on the list a while ago, and I believe in the instructions for one of the focus tests, to AF twice, as the first focus tends to overshoot or undershoot the best possible focus. In designing such a system, there is a tradeoff between speed of focusing, wear and tear on the motors, internal or body caused by too much time "hunting" for perfect focus. So the system gives you an "acceptable" focus on the first try, but will improve that focus if you press the shutter button again. This is even more important in low light levels or subject matter that has low contrast.
I'm just saying! It's what I've read. So studio or outdoors when shooting a static subject, focus twice. I shoot mostly action, so don't have the privilege most times as I'm handholding the camera. Given the tracking focus capabilities of the K-7 (and all those that preceded it), I have a low number of sharp images to show. I have in fact stopped shooting unless I can set ƒ 5.6 or smaller with a shutter speed of 1/90 and ISO of 800 or lower. I prefer 1/500 @ ƒ5.6 if I can get it. On Mar 20, 2011, at 06:21 , Paul Stenquist wrote: > I suspect it's more the camera than the lens, but it's anyone's guess. I > would first try fine focus adjustment in one kind of light, then see if it > proves accurate in another case as well. The focus adjustment procedure is > something that should be performed with all of your lenses in any case. My > DA* 16-50 has worked fine with the K-7 and K-5. I'm sure I used it with the > K20 as well. I don't recall any significant problems. > > Paul > On Mar 20, 2011, at 8:39 AM, Tim Øsleby wrote: > >> The combo seems to front focus a lot in the studio. In fluorescent it >> is hit and miss. Improves in halogen light, but I can't really trust >> it. It seem to do ok in daylight. I'm assuming that in house >> AF-adjustments is not the way to go. That it will be useless outdoor >> if I corrects it for indoor light. Am I right about this? >> >> FA* 85 is mostly spot on. So I'm blaming the DA* 16-50. >> >> What do you think guys? Should I use the situation as an excuse for an >> enablement? >> >> My eyes are not up to critical manual focus indoor. Should I look for >> another lens to use in the studio? Tamron 28-75/2,8 could be the lens >> I need. Also musing at 35mm 2,8 Ltd, but I end up regretting not >> buying a faster 35mm. Joseph McAllister [email protected] “ The early bird gets the worm, but the second mouse gets the cheese.” — Kevan Olesen -- 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.
