Question about Sigma 30mm f/1.4 EX DC HSM for Sigma

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Broken? My lens refuses to focus, either manually or on automatic. Not quite sure what the problem is, but I'm assuming the problem is mechanical. Any suggestions on how to proceed? The body seems to be fine, and works perfectly well with other lenses.

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Re: Broken?

If if won't focus manually then there is a problem with the helicoid and you'll need it professionally repaired. Don't force it.

Posted on Nov 04, 2007

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The lens does not focus manually or automatically.

I have a lot of experiencie repairing Sigma lens.
In this zoom 150-500, the problem is located at the focus mechanism. This is a rear-focus lens so the focus mechanism is close to the bayonet.
It is not very hard to repair, but is better if you send to a Sigma Service Station.
Normally the mechanism is stuck due to a fall or strong punch.

Sep 10, 2015 | Sigma APO 150-500mm F5-6.3 DG OS HSM-Sony...

1 Answer

I have a Canon 1000D wth the kit EF-S 18-55mm lens supplie dwith it. The lens does not show any of the auto-focus points when I hold the button halfway down. Is this becquse of the broken cable proble

The symptoms you've described are that of the possibility of a broken ribbon cable. As the second lens works on both cameras then the strong possibility is that it is the lens at fault and not the camera. Another quick test would be to put the 'faulty' lens on manual focus and check that it will focus in that mode. To replace a ribbon cable is not too expensive. With all items of modern photography they have intricate electronic circuitry and the definitive problem will only be known once a competent repairman takes the lens apart, but I think you've worked out the problem.

Aug 05, 2014 | Canon EF-S 18-55mm f/3.5-5.6 USN Lens

1 Answer

How can I find out the settings available on a Quantaray 70-300 mm zoom lens?

Quantaray has made several different 70-300mm lenses so I'm not sure exactly which one you have. However, if the lens doesn't have a AF/M switch it's no big deal. Assuming it's an autofocus lens, it's always on. If you want to switch to manual focus, flip the switch on the camera body.

If it's an older manual-focus Quantaray lens then the question is moot.

Jul 21, 2014 | Quantaray Camera Lenses

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This lens makes a whirring noise when attached to the camera body. It will not focus in either manual or automatic. The camera works well with the other lens.

Sounds like the focus mechanism is broken on that lens. There's a small screw on the back of it where it meets the camera body, the motor in the camera body turns that screw to autofocus. To me it sounds like the screw is turning, but the lens isn't focusing. You said it also doesn't focus in manual mode, so there is probably something inside the lens that needs repair or replacement. Your best option is to take it to a camera repair shop and ask them for an estimate, camera lenses are not the kind of thing you can take apart and fix on your own. Hope that helps.

May 03, 2011 | Nikon 35-70mm f/2.8D AF Zoom-Nikkor Lens

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Unsharp pictures when using the leica macro 90mm 4:0 lens as a telephoto lens

Besides any problems with the focus mechanism which should be fairly obvious, your shutter speed may be too slow. A slow shutter speed can be set manually or caused automatically when using a smaller aperture in lower light settings, the camera compensates by opening up the shutter. Try testing your lens out in bright scenes with the aperture open. Another problem is with manual lenses at low apertures. It can be difficult to manually focus at just the right point because shooting around f.4 with a longer barrel lens leads to a very shallow depth of field. To compensate, try a smaller aperture or take a few photos of a subject while adjusting your focus to get the "money shot." If all the above fails make sure to double check your sensor and lens are clean, a greasy or dirty lens will always lead to less crisp photos.

Feb 26, 2011 | Leica 90mm f/4 Macro-Elmar M Manual Focus...

1 Answer

I have a nikon D80 with a 18-135mm lens. Quite frequently the camera refuses to take pictures, but will take if I zoom in or out a bit (the lens is a 18-135mm). This happens both modes I have tried, so...

Maybe very new but you explained the problem so well and even gave an example, I wish others were so throw. I'm going to assume you are attempting a portrait (close to subject 10ft) with the lens at 135mm your depth of field would be fairly shallow, without looking it up and doing some math I'd say about 3/8 of an inch backing the lens up a little say to 100mm would increase this to about maybe 3 inches at your present aperture and shutter speeds. So two things are happening here one you have maxed out the lens close focus capabilities which you found you can back up to say 100mm and it works Second both "auto and P" will balance both the shutter speed and aperture obviously to give correct exposure. What this also does possibly is opens up the aperture ( I have no idea in auto) to I'd think about F5.6 at a shutter speed of 1/60 couple that with your 135mm and you have nothing for Depth Of Field. I'm still assuming you are taking a portrait could also be still life what ever the subject is close and depth of field diminishes the closer you are to your subject and using telephoto zoom lenses. I'll give you a case scenario for portrait at 10 actually better at 12 feet great place to start for what you are doing is (hand held) shutter at 1/80 and your F stop at F8 watch your light meter. Also with that camera you can activate what is called Program Shift, "P" which is program will allow the user to shift ether the aperture, shutter or both from the camera setting, again watch your light meter. If you hesitate a few seconds the setting will return to where the camera feels it should be. Program is the best way to quickly grab a shot then finesse the second shot it will actually teach you how to use the more creative zones Like "M" manual "TV" time value (shutter speed) and "AV" aperture value.
You have a great tool there and with a little time and practice you'll be making some great photo's
Hope I didn't confuse the issue

Jan 11, 2011 | Nikon Camera Lenses

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My lens stopped working in Auto Focus mode. I can take a picture in manual but I can't seem to focus clearly. I prefer using auto focus for my everyday pictures, but the lens will not work. I am sure it...

there is couple of possibilities like wise when you zoom lens manualy and can you heard the hard noise then could be AF unit itself faulty. AF unit gear is gone.
could be AF shaft broken thats why not focusing
could be AF Flex broken thats why not focusing
for that please bring to canon service center

Aug 11, 2010 | Canon EF-S 18-55mm f/3.5-5.6 USN Lens

1 Answer

Lens for Nikon D60

I will try to help you, but please understand that my experience is with Nikon film cameras. Assuming that the D60 works in a manner similar to a Nikon 35 mm body and that Sigma macro lens work like Nikon macro lens, you should be able to determine the usable subject to lens distance by experimentation. First, make sure the lens is in the macro mode. To do this you must set the auto-focus mode control to the manual focus mode (see your manual). On Nikon lenses, you must first set the focus ring to infinity, then move slider switch, which has two positions marked; "normal" and "macro., to the macro position. You should now be able to rotate the focus ring to the macro range. Use the zoom ring to zoom in and out and focus with the focus ring. The the range over which the lens to subject to lens distance will yield an in focus image will be rather limited and in the range of an inch or so to 6 or 8 inches.

Dec 09, 2008 | Camera Lenses

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My lens quit auto focusing

It's probably broke then. Clean the contacts to the camera and try again. If it still don't work you can probably be sure it is likely to be a bit faulty. Check the camera has auto focus mode enabled if appropriate.

Jul 06, 2008 | Sigma 28-300mm f/3.5-6.3 Macro for Nikon-D...

1 Answer

Buying a camera lens

Presumably you intend to use a DSLR. The automatic nature of modes relates to exposure. Lenses autofocus assuming you have turned the autofocus switch on. Switch the autofocus off if you want to manually focus. Whichever you use will not affect the modes

May 11, 2008 | Camera Lenses

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