Full my full frame the focus goes from close to far smooth, however my crop (60d) does not move at all on auto focus. any one else has this problem?
1047781
You mean autofocus doesn't move smoothly, can't autofocus easily and go back and forth or it does not even try to autofocus? Mine (On EOS 40D) does autofocus, it searches from close to farthest smoothly but it does not always autofocus easily, though I think the last one is due to lack of contrast or inability of the body rather than an error in the lens itself.
1047782
Don't really know what to say, other then the auto focus works perfectly with my camera. Sorry!
982896
I also should point out that FF lenses when used on crop-sensor cameras, such as yours, behave as a longer lens. By the tune of 1.6x so this lens when on your camera would be the equivalent of an 28-216. It's like you have a longer lens. There are some good points to that, one is that since the edges are cropped off and that's where the most lens distortion occurs you'll get a clearer, sharper pic.
447638
I had heard about the focus problems but we have had no problems with it what so ever. At wide open apertures, the depth of field is extremely tight, so I am guessing that some people who have less photographic experience were the ones complaining, because even at those apertures we are producing tack sharp images, on auto-focus or in manual on our Canon cameras, a T5i and a 60D. Sigma has released an updated version of the 50mm in their new "Art" lineup, so if you still have concerns, save up for that one. I've played with it at our local camera store and it is beautiful!
1920217
My Daughter has this Camera and now her auto focus isn't working on it, so she has to manually focus it. I'm wondering if it is the lens or is it the body of the camera. She only has one lens so she hasn't been able to trouble shoot the problem and since she's away at college I'm unable to do anything about it at the moment. Anyone have any ideas?Thanks
220775
If the AF during video recording is indeed a problem, I would think it would be a relatively easy fix by Nikon with a firmware update. Sounds like the camera IQ is a little sloppy when it comes to deciding when it needs to re-focus during video recording, with either Full AF on or off. I believe with Full AF turned on it is supposed to continuously re-focus and with it turned off it will only re-focus when you zoom in or out.
1157231
Thanks, Philip. I kept mine, still really pleased. Learned that shooting in "Auto" is my best friend right now (clear crisp photos at any distance from macro to nearly all zoom), but glad to hear the "shaken when stirred" is not a sign of something wrong, or about to go wrong. Best wishes.
1609945
I am Sorry i forget to Include this Information with My Response! Be Sure to Include a f-Stop Increase to being thing into Focus Also! This is Very Important Too! It is Something You Have To Experiment with to get Correct! Not Hard to Do, Just Use Live View on your Camera and Play with it from there! This Aspect is Very Tricky for Focusing and Experience will be Needed to some degree!
220774
I have the same problem with the autofocus for video recording (even when set to "Full AF"). It occurs mostly during zooming in and not as much when zooming out. Sometimes, after zooming in, it will lose the focus and then regain it or not at all at times. This problem has occurred in bright light and sun outdoors and indoors in decent and dim light.It's too bad since the quality (color and clarity) seems excellent.
379181
With mine I have to be ridiculously close to the subject, like maybe an inch away. Try putting your lens closer and closer to what you're photographing until it is in focus before trying auto focus.
662611
I have not had exposure issues but I have had focus issues. Not really issues, as much as just not being happy with the focal range at all, or the autofocus system. If you are shooting auto I can see you having problems as the auto systems just do not seem to be up to par compared to other platforms
1282026
When we first got ours we had the same problem with clarity and had searched all through the menu options with the blurry image trying to find it. The plastic part around the lens is what you use to focus the image. The first time it felt like that wouldn't move but if you keep at it gently it will work and then you won't have any problems moving forward. Once you fix the clarity you can read the menu better to adjust the image size. Good luck.
833865
Sorry I just saw the incoming email. Let me understand first. Are you saying that there is no way to do an "autof" on your camera with the lens? Try half way press the shutter see if the focus can be achieved.
1234466
I believe this is happening because you are using a cropped lens (the Sigma 18-250mm) on a full frame camera (the Canon EOS 6D). Although there are people who do use cropped lenses on full frame cameras (they crop the image using software after it has been taken), you would likely better be served by using a full frame lens on the camera. You can do this by checking which Canon (or aftermarket) lenses are designed for full frame use. Full frame lenses are usually heavier and more expensive, but they are designed for the larger sensor size format of full frame, and often produce more detailed images than their "cropped" sensor relatives. I believe this is happening because you are using a cropped lens (the Sigma 18-250mm) on a full frame camera (the Canon EOS 6D). Although there are people who do use cropped lenses on full frame cameras (they crop the image using software after it has been taken), you would likely better be served by using a full frame lens on the camera. You can do this by checking which Canon (or aftermarket) lenses are designed for full frame use. Full frame lenses are usually heavier and more expensive, but they are designed for the larger sensor size format of full frame, and often produce more... » Read More I believe this is happening because you are using a cropped lens (the Sigma 18-250mm) on a full frame camera (the Canon EOS 6D). Although there are people who do use cropped lenses on full frame cameras (they crop the image using software after it has been taken), you would likely better be served by using a full frame lens on the camera. You can do this by checking which Canon (or aftermarket) lenses are designed for full frame use. Full frame lenses are usually heavier and more expensive, but they are designed for the larger sensor size format of full frame, and often produce more detailed images than their "cropped" sensor relatives. « Show Less
739837
I also have this slow focus problem on my D300 and D700. Slower focusing than any other lens I have used. Anyone heard about a fix for this yet?
899760
I have a D3200 and autofocus is fast to f / 4, it takes much less to focus, and the VR lens does not work with it
237581
I have the same camera. It's perfectly normal. It's just the camera focusing.
1107060
My question, is, if I use any full frame lens A-mount, there wont be any cropping factor?, but if I use any APS-C, like DT lenses there will it be?