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I have the same problem and I make this: take out the zoom lens from the body and put it again. The auto-focus comes back. Another my solution: Push autofocus buton to M (manual) and back to A (auto). Then sometimes starts again to work autofocus. But still I know it is not final solution... Zvonko
This is not a zoom lens, it is a fixed focal length of 300mm telephoto, so the focus ring will not slide back and forth, merely rotate. It is also manual focus. If you google it, you may find a manual, but doubtful - best bet is to get a book on basic photography and read up on telephoto lenses there. Update - allegedly made by Tokina, so should be a reasonable lens.
No fault of the camera it's has been programed in custom function #9 for mirror lock up. In mirror kock up mode first click of the shutter button locks up the mirror the second takes the shot and lowers the mirror. Mirror lock up is most often used while tripod mounted for extreme close ups or macro photography and also where a large telephoto lens is used. Mirror lock up is for reducing camera vibration during exposure. You can go into your custom function menu scroll to #9 and turn this off and all will return to normal.
You don't say what sort of telephoto you want to buy or how much money you want to spend but basically anything longer than a 50 mm is regarded as telephoto.
A staring point for you maybe the lens listed below:
Nikon Telephoto Zoom 70-300mm f/4.5-5.6G IF-ED AF-S VR It importantly has VR or "Vibration Reduction" on it to reduce camera blur when hand holding telephoto shots. This is just a staring point... You need to work out what you want to photographCheersIan
Believe it to be a camera fault. Reason: zoom feature makes the lens extend for telephoto work, therefore, the autofocus feature should be working at any distance you set the lens for and your shots should be clear. Could be an autofocus problem or the lens and CCD are misaligned at the telephoto position. Have the camera checked by a qualified repairperson. Get an estimate first. You may want to ask this question at the Canon website also.
It will not work because it is the wrong thread size.
Here is info on the Olympus TCON-17 lens for the 5050:
TCON-17 (1.7X) Telephoto Conversion Lens
Extend the capabilities of your digital camera with the TCON-17 Telephoto Converter lens. This telephoto lens will increase the magnification of your subject by 1.7x when your camera lens is set to the telephoto position. This will help you bring in the subject when you can't get closer, for example, shooting sports or concerts. Please see below for additional items required to attach this lens to your camera.
The following models require the CLA-1 and 43-55mm Step-Up Ring:
The video lens is too small (diameter). If you found one with a 43mm thread and put it on the 5050, you would experience severe vignetting (clipping of the corners of the photo).