{"id":961,"date":"2009-05-09T03:52:00","date_gmt":"2009-05-08T15:52:00","guid":{"rendered":"http:\/\/www.kentyuphotography.com\/blog\/2009\/05\/my-rough-autofocus-test.html"},"modified":"2012-02-23T19:51:11","modified_gmt":"2012-02-23T06:51:11","slug":"my-rough-autofocus-test","status":"publish","type":"post","link":"https:\/\/www.kentyuphotography.com\/blog\/my-rough-autofocus-test\/","title":{"rendered":"My Rough Autofocus Test"},"content":{"rendered":"

All lenses can inherently be affected by front or back focus problems. Out of the blue, I was a bit curious whether my lenses have such problems and I don\u2019t have a test chart handy, so I did a very rough autofocus test of my own. Proper test charts can be found on the net.<\/p>\n

The lenses I tested were Nikon 24-70mm f\/2.8 and Nikon 50mm f\/1.4.<\/p>\n

The settings used were ISO200, f\/2.8, 50mm, ~1\/80s. I also had the D700 on the Manfrotto 055XPROB tripod to minimise camera shake. <\/p>\n

I had the camera at about 45 degree from the test card and then autofocused on the right edge of the grey bar (the red box shows where my focus was – a feature from ViewNX). <\/p>\n

<\/a> <\/p>\n

To inspect the focus, I zoomed to 100% of the image and checked the focus and Depth of Field (DOF). Below are 100% crop of the test shots.<\/p>\n

100% crop – Nikon 24-70mm f\/2.8 @ 50mm, f\/2.8<\/p>\n

<\/a><\/p>\n

100% crop – Nikon 50mm f\/1.4 @ 50mm, f\/2.8 <\/a><\/p>\n

From what I can see, the focus of both test shots were pretty much where I focused (indicated by the red box), sharing about the same DOF to the front and back of the focus plane.<\/p>\n

While I probably will do the test again with a proper test chart, for the time being, I will leave the camera without any AF tuning.<\/p>\n","protected":false},"excerpt":{"rendered":"

All lenses can inherently be affected by front or back focus problems. Out of the blue, I was a bit curious whether my lenses have such problems and I don\u2019t have a test chart handy, so I did a very rough autofocus test of my own. Proper test charts can …<\/p>\n","protected":false},"author":1,"featured_media":3916,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[169],"class_list":["post-961","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-gear-talk","tag-sharpness"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t