tag:blogger.com,1999:blog-5826231802859523569.post3662535466325967180..comments2024-02-12T03:21:03.402-08:00Comments on Ron Martinsen's Photography Blog: Ask Ron: Does the 5D Mark III make autofocusing faster with traditionally slow focusing lenses?ronmartblog.comhttp://www.blogger.com/profile/06815090271742112506noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-5826231802859523569.post-11910690592649674832012-08-14T17:03:06.610-07:002012-08-14T17:03:06.610-07:00Hi Chris,
Thanks for chiming in.
I can see how ...Hi Chris,<br /><br />Thanks for chiming in. <br /><br />I can see how you'd see a significant improvement by taking advantage of the AI Servo/One Shot toggle, and by looking at your images and seeing your comment about "anything more than portrait distance" implies that you are probably doing more longer distance movement shots with these lenses. That's a place where AI Servo improvements do indeed matter, so I can see how you observe there is an improvement.<br /><br />What I was mostly testing was the One Shot AF scenarios and the time it takes to actually aquire focus. As a user of a 1D Mark IV, I already had a camera that did well with AI Servo scenarios with these lenses but focus acquistion time and accuracy in One Shot was abysmal no matter what camera I used. I have not observed any benefit in that area with the lenses tested using the 5D Mark III, so I stick to my comment. <br /><br />I would agree with your comment and your photos though that AI Servo improvements are signifcantly better with all lenses on the 5D Mark III over the 5D Mark II simply because the old version on the II did in fact suck quite bad. The NEW 5D Mark III AI Servo improvements put it on par with my 1D X in most aspects, so there should be a night and day difference there. Thanks for raising that point as I probably wasn't clear enough in my article on this detail.ronmartblog.comhttps://www.blogger.com/profile/06815090271742112506noreply@blogger.comtag:blogger.com,1999:blog-5826231802859523569.post-14201530482352644732012-08-14T16:09:30.397-07:002012-08-14T16:09:30.397-07:00Hey Ron, I beg to differ!
Yes my 85mm f/1.2L II ...Hey Ron, I beg to differ! <br /><br />Yes my 85mm f/1.2L II would often disappoint when used on my Canon 5D II especially at f/1.2. From anything more than "Portrait distance" the 5D II would rarely nail focus at f/1.2, even on a static subject let alone a moving one. However, I have found the focussing of this lens with the 5D III to be absolutely excellent. Using your tip to toggle between one-shot and AI-Servo I have managed to get some great action shots of the kids. I have some great results even at f/1.2 but stopping the lens down a little to f/2 helps.<br /><br />For example, take a look at these shots on my Flickr stream. <br /><br />http://www.flickr.com/photos/phototoasty/7784445866/in/photostream<br /><br />http://www.flickr.com/photos/phototoasty/7784438384/in/photostream/<br /><br />http://www.flickr.com/photos/phototoasty/7784501864/in/photostream/<br /><br />I have uploaded at full resolution so that your readers can see how sharp they are.<br /><br />I can now use my 85mm f/1.2L II with confidence!<br /><br />The same goes for my 24 f/1.4L II.<br /><br />Regards,<br />ChrisPhototoastyhttp://www.phototoasty.comnoreply@blogger.com