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There is a problem inside your lens. It can be a flexible PCB (printed circuit board) or screw out of possition, so the focus moving parts can´t complete the range.
If the infinity focus gets at 3ft, there are also some optical group loose. That is the reason infinity position is located closer than it must be.
Send it to a Sigma Service.
First auto focus SLR. Does not focus well in low light. Put on manual focus at infinity setting on lens scale, and put camera on tripod and set the lens to something likeF8. Set exposure time to different settings and see which one works out best. You might also check your local library from one of the Kodak guide books (low light photography, etc.)
The 55-200mm lens does not focus closer than 1.1 meters (3.6 feet). If the subject is too close, then the autofocus tries and fails to focus or keeps trying (and squeaking). Either way, you won't be able to take a picture. In manual focus, you can take a picture but it will be out of focus and blurry.
Every lens has a minimum focus distance, closer than which it will not focus. Some lenses focus closer than others. It's a matter of design; making lenses focus closer makes them larger, heavier, and more expensive.
If you want to take close-ups, you have several options. You can buy close-up adapters that fit onto the front of a lens. You can buy a special close-up lens ("macro" or "micro" lens). You can buy extension tubes to fit between the camera and a lens.
You haven't stated the make and model, but you have probably left your camera set to "macro" mode. This is used to focus closer than the lens can usually do and when in use the lens cannot focus on infinity (distant objects). If there's no button or menu item labelled "macro" the standard icon for it is a picture of a flower with the stem and two leaves.
Please report back with the make and model of your camera if this fix doesn't work, but if I have fixed your problem then please let me know by rating my answer.
As this is such a common problem I hope that you don't mind me pasting my generic answer below; there's no point in reinventing the wheel :-)
You have probably left your camera set to "macro" mode. This is used to
focus closer than the lens can usually do and when in use the lens
cannot focus on infinity (distant objects). If there's no button or menu
item labelled "macro" the standard icon for it is a picture of a flower
with the stem and two leaves.
Please report back if this free answer doesn't work and I will research a model-specific answer for you (also free), but if I have fixed
your problem then please let me know by rating my answer.
Hey redbarnz, If the lens won't focus to infinity then there is probably something physically wrong with the lens. With the dominance of digital equipment you can find fantastic deals on manual focus 35 mm lenses. I would look at Canon manual focus lenses rather than sticking with vivitar. I hope this helps! Sincerely, Allan Go Ahead. Use Us.
That is the focusing ring. I'm guessing your camera is set to focus automatically (Little switch on the side of the lens should have settings for either AF or MF, or something similar.)
If its on AF, you don't need to adjust the focus ring. However, if you have problems with the AF (sometimes it has trouble, especially in low light) you can switch it to MF, and focus manually by changing the ring.
As a general guideline, the more you twist to towards macro, it focuses closer and closer, and infinity futher away (if you're taking a shot of the moon, you want it on infinity)