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70-300 DL Sigma Macro Zoom lens element loosened, and then reset

I sold a lens, shipped it, and the buyer heard a noise, a piece of glass, lens element had loosened. When I got it back, i simply rotated the zoom and the element reset. Is this possible/normal?

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Amaizin, That's not really normal, because you might only normally hear a tiny noise if you shake a lens not mounted on the camera, but not loose glass sound, everything is fixed and solidly set for alignment when focusing if any element is loose it could never be able to get a clear focus and the element would be so scratched there would be all kinds of distortions even if it went "back into" place. You'll hear loose glass after you drop a lens on to the sidewalk or hard surface and an element is dislodged. Inspect the lens body for an impact mark a lightened portion in a ring shape where the metal or plastic has been stressed or the telltale signs of an abrasion from something like a hard rough surface such as concrete (a little group of pin **** on a corner). The lens should be inspected by a reputable shop to determine if it needs to be repaired or replaced. I take it that you were selling it to upgrade to another lens or other equipment. randy320sgi

Posted on Jan 30, 2009

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1 Answer

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It could be the lens is damaged on the inside (Gears and so).
But before you make any conclusion. try to switch the camera to auto mode and make sure the camera is not in the macro mode.
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This is not a solution but the same kind of problem.

I just bought a Nikon D5100 and found that my Sigma 105mm macro has a problem. The camera will not power up, but if I turn it on, untwist the lens and then twist it back in, the camera powers up. If I leave it for a few seconds, it powers down again. Provided I keep taking photos, it works, but this is not acceptable because it can take several seconds to get a focus on a close-up, and by time I get the focus, the camera powers down again.

I never had any problems with this lens on my Nikon D80. I also use several lenses, all of which work well with both cameras. It's only the Sigma that has the problem. And I did clean the contacts with a proper contact cleaning solution and a swab, but still no joy. My lenses are made by Tamron, Pro Optic, Nikon and Sigma, and the only problem lens is the Sigma.

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Can i change my lens to other lenses like fish eye, wide angle or macro lens or even zoom lens?


This is a fixed lens camera so the short answer is no. However there are third party accessories lenses that can be screwed to the front of the lens to give a "fish eye" or telephoto capability. To get "Macro" there is a kit available which has a series of three close up lenses these lenses screw to the front lens element of your camera allowing for some pretty impressive macro capabilities.

Again to answer your original question no you can't change the lens on your camera

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How about a Sigma DL ZOOM auto focus 75-300mm 1:4-5.6 lens onto a Nikon D-40?


That particular lens should work on the D40 if it is made for the Nikon mount.
If not, you'd need an adapter to fit it to the Nikon mount. (i.e. if it is a Canon-type lens, you'd need a Canon-to-Nikon lens mount adapter).
You'd probably have fair luck selling it on eBay and buying the right kind of lens for your Nikon.

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I have read a lot about chromatic abberation and softness at edges of Sigma 70-200 F2.8 lens, what is your experience. The exact lens model is "Sigma 70-200mm F2.8 EX DG Macro HSM II" Galway canon fan.


All zoom lenses have softness at the edges and all have certain apertures that are the best for sharpness. You have to experiment to find the ones for your lens. Chromatic abberation is something you would have to use a magnifying glass on your computer screen to see. Don't worry about it.

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If you just purchased the lens I would take it back sounds like the lens is jarred and defective should still be on warranty

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1 Answer

Use of teleconvertres


Teleconverters are not recommended with variable aperture and slow zoom lenses. Since there is an additional element, the effective max. aperture will get reduced to about f/8-11. So it is not worth the money.

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