How do we zoom with a canon 6d camera with a 24mm-105mm L version lens?

No, EOS systems only use lens at a fix focal point like 50mm, or lens that have zooms built in, ie; 24mm to 105mm. You can zoom images in a image editor like Photoshop.

Vignetting cannot be eliminated, though some programs like Photoshop can correct for it.
On some zoom lenses, you can reduce the amount of vignetting by shooting at a higher zoom. For example, if your lens is 24mm - 70mm, you will get more vignetting at 24mm than you would at 70mm.

If this is the Sigma 28-105mm f/2.8-4.0 as in the title, then the maximum aperture will vary with the focal length. It is probably only 2.8 when the focal length is zoomed to 28mm. It will be 4 at 105mm, and at focal lengths in between it will be in between.

I had a similar situation with a 100mm macro. I used the Canaon US site and comunicated via the internet and they sent me a pdf of the manual. "Service and support, support by email."
http://www.usa.canon.com/cusa/consumer/products/cameras/ef_lens_lineup/ef_24_105mm_f_4l_is_usm#ServiceAndSupport

The D5000 is not a professional camera, it's very much a low-end introductory consumer grade digital SLR aimed at first timers. It's a fine camera, but wouldn't last more than a few days at best in professional use.

The camera usually comes bundled with a "kit" lens, such as the 18-55mm. Like the camera, it's a cheap and cheerful model which is really intended just to get you started. It costs very little to make, and like the camera body it's not designed with longevity, servicing or repairs in mind.

But to answer your question, yes, you can buy the D5000 as a body only option without the kit lens and then add on whichever lens you prefer at extra cost. The 18-105mm has a longer zoom range so has more flexibility than the 18-55mm, but once again it's very much a consumer grade lens. You don't get anything for nothing, so in return for the additional zoom range in a lens which is of a similar grade to the kit lens you get poorer image quality and really noticeable barrel distortion at the wide angle (18mm) setting and pronounced pin cushion distortion at anywhere above around 24mm (click here). You can't avoid these distortions entirely as all zooms are a compromise, but the kit lens suffers far less than the 18-105mm and also has a better all-round image quality (click here). Again, not to professional standards, but more than adequate for almost all amateur users. To be fair, although the 18-105mm appears to be based on an older design and is totally unacceptable for any professional use, it also is perfectly adequate for most amateurs and is relatively good value at the comparatively low price it can be purchased for, but the Nikkor AF-S 55-200mm f/4-5.6 G ED DX is by far a better lens altogether and just happens to have very low image distortion across the zoom range. If you can get one, it's the ideal companion to the kit lens. Best of all, it's actually cheaper than the one you propose getting (click here and here for comparison)and offers a much more useful telephoto range.

Please feel free to ask any questions if I've failed to answer your question in any way, otherwise, please take a moment to rate my answer.

problem in zoom motter unit repair it

Hi i am sagha from mumbai,Being a technician i can suggest you that this problem is not solvable by yourself. It has got a broken film PCB inside your lens.It is getting partially connected when on 24 mm so hurry get it repaired from recognised repairer or else will show error on all focal lengths.All the best

There is no digital zoom in DSLR

Normal 0 MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman";}I believe it is equivalent to a 35 to 210mm lens on a 35mmcamera. If you are considering a Nikon such as the D60, D80, D90, etc.,the standard lens sold with the camera is 18-135mm. This is not the sameas an 18-135mm on a 35mm film camera. The equivalent 35mm film cameralens would be 27-202mm (you multiply by 1.5), about the same as what youhave now. If I were planning to do wildlife photography, I would buy a usedNikkor ED 70-300mm AF lens on E-bay. You should be able to get one for$200 or less (the new price is $550+). This lens is designed for a 35mmfilm camera and is the equivalent of a 105-450mm when used on a Nikon digital cameras. Additionally, it is compadable with the automatic features of the Nikon digital camera bodies. This would give you an excellent portrait lens at 105mm and extra long reachfor wildlife. The fast shutter speed and stabilization circuit on thedigital camera should make it usable in daylight without a tripod. I havethis lens on a Nikon film camera and it is a superior lens. At a 1/1000second or faster shutter speed, I get sharp hand held photos.