Sahid Limon
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 p.1 #12 · Pre-production 1Dmk4 tests with Ai-servo | |
darryn patch wrote:
Pilot error without a doubt 100%, The scenario that you've shot in using AI tells me you really haven't got much of an idea of how AF works or what mode of AF to use in which situations. Would that be correct? yes.
I'll give you 2 bobs worth of advice for free, Ai Servo is solely designed for moving subjects. not stationary objects.
Go and educate yourself on AF and then pick up the camera and try again.
Wow... I had no idea that you knew everything about me and my knowledge of focusing and cameras. You even answered your own questions for me.... awesome. Just to clarify a bit though, I had a 1Dmk3 (not to mention used the 1Dmk2), so I am quite familiar with how AF works on a pro series Canon camera. I also know how the camera (1Dmk3) once had a hard time tracking and locking focus on a moving subject, and Canon had to ultimately admit their faults, and fix peoples cameras. If you don't believe me, just do a search on this forum or google, and a few of these focus issues may magically appear.
The subject in both of these images are NOT stationary, but walking to the left and slightly towards the nikon booth. It would be pretty silly to test Ai-servo function of a camera on a stationary subject, right? I specifically wanted to test the Ai-servo mode, since I knew the mk3 had issues with it. Focus was set on default, which as Canon claims... should lock focus on a moving subject without any problems. Yes, I could have changed the focusing to only the inner points or the center point, but why should I have to? The default setting, in this case the 45 points with the 20 outer points and 39 inner cross points, should easily be able to lock and track a moving subject without any problems... as Canon claims. Too many things in the way you say? Check out the Autofocus video from Canon here around the 3 min mark, where they claim that even with multiple subjects within the frame, as long as the initial lock is made on a subject, the camera should keep up... such as a sporting event with multiple players. Heck, as I already mentioned, the focus seemed to be just fine through live view, but didn't work as well when live view was off. The 1Dmk2N had no problems with this, and neither did the 1Dmk3 after the fixes. I do agree that on the 2nd example, the camera seems focused on the can, and ultimately focused to the subject that I had chosen. However, the first example, it started off great with the subject, and the just fell off.
Was this the ideal environment for a test? Absolutely not. Is my camera work perfect? No. Could this have been an user error? As I stated in the original message, it very well could have. I posted the topic to find the answers myself, as I want to know if I had just screwed up, or other FMers who tried the camera also saw a problem. Unless you happen to test out the camera at the floor as well, I don't think you should jump to the conclusion that I screwed up 100% on my end... because hey, cameras can have problems from time to time. I didn't post it to claim that the new mk4 cameras have a focus issue, or that they are not usable in Ai-servor. I posed a question that any prospective buyer may have, and wanted to know if anyone else had a similar experience who had a chance to test it out personally. So I'm not making a claim, but asking a questions. So I really don't see a reason for the flamming or attacking since I'm not doing such things to anyone else.
And of course, the "test" is presented in such a way that there's no Exif to be had so that we could see which AF points had been activated.
I thought it was pointless to upload all of the images one by one, and would be better to just post it in one file with smaller resolution. You want to see the images themselves, I'm uploading them now here, so go nuts.
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It still should lock in better than it did... 
. Now get some decaf and chill Mate... 
