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Sigma 70-300mm f/4-5.6 DG Lens Questions & Answers
The difference will be that it should allow you to focus closer then normal. I own a macro lens with a switch like that, normally it focuses to 4.5 ft minimum. But if i'm zoomed up to 100mm, i can flick the switch to allow me to focus up to 3 ft away. If you need further help, I’m available over the phone at https://www.6ya.com/expert/erik_3934b541f17c4e99
Lens doesn't work but the
"F--" means the camera thinks there is either no lens attached or a non-cpu lens is attached. Looked on bottom of camera for a very small reset button. If one is there, turn camera on and press for about 2 seconds. With camera off, remove lens and with a slightly moistened pad, clean electrical contacts on bot lens and camera body. If neither works, see if a different lens does work. If a different lens works, then it is the original lens, if not, it is the camera.
Bought a Sigma DG 70-300mm 1:4-5.6 autofocus for
The Sigma 70-300mm f/4-5.6 DG will not autofocus with the D40 since the lens does not feature an internal focusing motor (HSM). The D40 does not have an AF motor in the body and hence it can autofocus only with lenses featuring an integrated motor (eg. Nikon AF-S lenses, Sigma HSM lenses, Tokina DX II series etc). Unfortunately you can use the said lens only in MF mode.
Sigma 70-300 lens will not move in auto mode.
It's almost certainly got a stripped drive gear. This is not a DIY repair, but if the rest of the lens is in excellent condition and not more than around five years old then it's probably cost effective to get it repaired. Sigma are normally excellent at supplying spare parts for their lenses.
Get an estimate for the work from a photographic repair specialist but be prepared for at least a four to six week turnaround time as that's what I'm currently finding for good repair outlets on both sides of the Atlantic.
Where can I find out how to take apart a Sigma 150-600mm contemporary lens?
Taking it apart is not the problem - re-assembling it will be. Unless you have access to an optical laboratory, where laser instruments can measure the exact tolerances required, don't even think about it. You will be left with a pile of optical components, and a far higher repair bill than if you had just let the experts sort out the problem in the first place.
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