Is it possible to see the user manual of the sigma uc zoom 70-210?

Sigma makes their lenses with a variety of mounts. If the lens has a Pentax mount then it will work with your K20d.

It depends on the lens mount. Sigma makes varieties of their lenses for different camera mounts. A lens with a Canon mount will be compatible with any current Canon camera. A lens with a Nikon mount will be compatible with a Nikon camera. Any one lens can fit one but not the other.

In short, no. Not without an expensive adapter which includes a corrective lens (which also reduces the optical quality). Even then, the lens will be fully manual only and might only be operable at the widest aperture setting.

If your Canon uses the APS-C sized sensor (all except a few highly expensive professional full-frame models do) then the 70-210 lens will produce a cropped image as if you were using a 112-336mm lens, so it may also be less useful to you.

Yes. It's a push pull zoom action.

One touch zooms as used on 35mm film SLRs used to have the same mechanism, the zoom ring twisted as well to achieve focus but now that most lenses are autofocus that's unnecessary. So you have a lens which just retains the push-pull, a far more natural action in my opinion and usually faster than a rotating zoom. Once you get used to it I think that you'll prefer it.

By contrast, most modern zooms have what was considered in 35mm terms to be an old-fashioned twin touch zoom: one ring was turned to zoom the lens and another was turned to focus it. This sometimes meant that after zooming you had to refocus; your push pull zoom will likely have a more technically demanding constant focus zoom action, there will be an additional manual focus control as well, but it's very much a minor secondary control used only when your AF has broken or is switched off.

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It may need a new drive belt

Hi
Dose the lens make any movement or is just dead
it may need a new AF motor

Most people disengage the digital zoom and only use the optical zoom. The digital only enlarges the pixels thereby degrading the image...why would you want to do that?

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the string is a felt dust stopper if you take off the rubber zoom grip you will see black tape peel off the tape and the base of the zoom ring will slide off just remove the rest of the felt clean the barrels and put back it will be ok without the felt you can stick back the part of the zoom ring with tape

HI I need to no what fit the lens is