tag:blogger.com,1999:blog-4063079619074407721.post7773751796766277266..comments2023-07-26T04:24:52.429-07:00Comments on PENTAX DSLRs: K20D AF Adjustment Chart expanded as per the constructive comments received.Anonymoushttp://www.blogger.com/profile/16363645754592641317noreply@blogger.comBlogger5125tag:blogger.com,1999:blog-4063079619074407721.post-31519301198989461032010-08-31T08:39:25.579-07:002010-08-31T08:39:25.579-07:00Rather nice blog you've got here. Thank you fo...Rather nice blog you've got here. Thank you for it. I like such topics and everything connected to them. I definitely want to read more soon.<br /><br />Bella SimpsonAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-4063079619074407721.post-28432321274391303542008-06-04T08:39:00.000-07:002008-06-04T08:39:00.000-07:00Although I am receptive to all comments, it seems ...Although I am receptive to all comments, it seems that most positive comments are sent to me in an email and most negative comments are posted here, under (surprise!) Anonymous.<BR/><BR/>If you have to leave comments criticizing this method, please leave your name so that we can take you seriously. Signing anonymous is sort of a coward way to express your opinion based only on your opinion. Let us know who you are and the basis of your conclusion.Anonymoushttps://www.blogger.com/profile/16363645754592641317noreply@blogger.comtag:blogger.com,1999:blog-4063079619074407721.post-85193842466624923822008-06-04T00:38:00.000-07:002008-06-04T00:38:00.000-07:00This is will NOT work well for angled test shot!A ...This is will NOT work well for angled test shot!<BR/><BR/>A cross target should only be used for vertical object (target parallel to the plane of sensor). Once it is angled, you simply won't know what part of the vertical line the focus is on!<BR/><BR/>For angular test chart, only use a one line target. For the most accurate test chart - even an angular target should not be used. Pentax service center uses a vertical target with one half black, one half white, and a 30 degree scale attached at the bottom. And the AF sensor focuses on the vertical target and not the angular scale.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-4063079619074407721.post-19253767808666005252008-05-21T07:57:00.000-07:002008-05-21T07:57:00.000-07:00Yvon,Like the previous, comment I'm also appalled ...Yvon,<BR/><BR/>Like the previous, comment I'm also appalled at the lack of civility of many on the web...I guess it's just a sign of the times. I applaude your passion and willingness to help all us Pentax users. Keep up the Blog, and just ignore all the ignorant and the rant and ravers...DanCAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-4063079619074407721.post-86760715033132834872008-05-20T07:40:00.000-07:002008-05-20T07:40:00.000-07:00Let me add my thanks for a very useful tool to che...Let me add my thanks for a very useful tool to check out focus problems. I am also appalled at the rude remarks you are getting on some other forums... <BR/><BR/>I had used your technique with a Jackson chart (http://FocusTestChart.com) but elevated the chart by leaning it against a stack of books. Not nearly as effective to be sure.<BR/><BR/>But I had read somewhere that the camera should be located some 2 meters away from the chart. Well you can imagine what the depth of field of my DA18-55 f3.5-f5.6 at that distance showed ie. Everything was in focus and the test was not effective.<BR/><BR/>But your folded chart, sitting on a ruler at the edge of a table was very effective, and I found that lens adjustments were necessary! By placing the camera as close as possible to the chart, focus adjustments were easy to detect. Thanks very much for a useful tool!<BR/><BR/>The larger focus centre will be useful. I found that the closest focus distance for my DA50-200 was much longer, and at that distance it was harder to carefully focus on the centre portion.<BR/><BR/>DickAnonymousnoreply@blogger.com