Pre ai lens needing lubrication to focus

The "MF" in "Sigma MF 500mm f/7.2 APO" designates the lens as manual focus.

Good day,

I have heard a lot of complaints about people taking Blurry Photos.

There are a few possibilities for it and a few easy fixes.

The first possibility I would identify is a dirty lens. To fix this simply take a clean microfiber cloth and gently clean the lens until there are no smudges visible.



The other possibility I would identify is that the pictures are out of focus.
This problem can be caused by a dirty lens or because the object or person was not focused on. To ensure focus on your photos, line up your shot and wait for the camera to focus by pressing the shutter button half way down. When focused press the shutter button in all the way and hold the camera still until the photo appears on the screen. By doing this you will eliminate any motion that might mess up your shot.

Please let me know if these tips work for you!

Regards

Yes. The D300 has a focus motor built into the body and thus does not need one in the lens. The lens will also meter properly with the D300.

The sports mode on a DSLR just picks high ISO and fast shutter speeds for you. Go Karts are very fast subject to focus on, so there are two techniques you can try.

One is to set your focus to manual mode and pre focus a point where the car will pass through. Set the camera to multi shot mode and just before the kart gets to the pre-determined point, hit the shutter button. The camera will fire off a few shots, then review later on a computer to chooset the best one out of the sequence.

Another way is set your focus mode for AI-Servo or Focus Tracking mode, this will enable the lens to track moving subjects (as single shot mode is way to slow to keep up with karts). Go to the slowest part of the track to get more sucess.

One problem you maybe having is that the shutter speed is too slow for karts. Being indoors the lighting will be very poor, so a super high ISO rating will need to be used to get faster shutter speeds. Having a lens with a very wide aperture (like f2 of f2.8 or even less) will enable you to get faster shutter speeds because they let in more light.

Good luck.

Maybe lens needs adjustment. The info on this page may help. Copy and paste this link for more info.


http://www.fixya.com/PostAnswer.aspx?thid=1841738&prdid=447928&ctgid=67

hi side


have you tried there support page at canon support

they will be better advised to help.

riz.

if you cant afford it read this,
The reason for this is that I find it easiest to track a moving subject if it's in the middle of the viewfinder. Cameras cannot know what you want to focus on, and if you start using multiple AF points, how is the camera supposed to know that you want to focus on the bird and not the tree - cameras are lacking in human thought processes! What is quite handy though is using the AI SERVO FOCUS or AI FOCUS settings so that the lens will alter it's focus on the subject over which the centre AF point is aligned as it moves towards you or further away from you. Without this, the focus will fix at the point you half depress shutter and if the subject comes closer or goes further away then it will be out of focus. you can call any expert of lences also for it if you can afford.

As you have found out, it is not a lubrication issue. It would seem that your lens has a problem with the linkage arm inside the mount. The arm that extends out of the mount could be bent or misaligned. It would be fixable, but the parts are somewhat delicate. Best to let a good repair person have a look.

defective focus lens circuitry, you need pro fix.

One Shot AF will focus on something and stop the AF process. One Shot AF will not fire the shutter until the lens is in focus with something. This AF mode is available in some PIC modes, like Macro mode, I think. AI Servo AF will not lock the focus, and if the subject or the camera moves, the camera will continue to seek a sharp focus. Servo AF will allow the shutter to fire whether in focus on not. This is mode only available in the Sports PIC mode. AI Focus starts out in One Shot AF, but if it detects subject movement it switches to AI Servo. It does not switch back to One Shot unless you release the shutter button and start over. This mode is available in P, Tv, Av, M and probably some PIC modes. The DRebel defaults to the AI Focus in most modes but switches very easily into Servo. Much easier than any other EOS camera I've used. In fact, too easily for most people. For example if the camera locks focus and you them move the focus manually (only on lenses with FTM), or sometimes if you zoom, or even pan the camera; all of these can force the camera to switch to Servo when you don't really want it to. The Wasia (Russian) firmware hack can force the camera to stay in One Shot, but it can't force the camera to start out in Servo.