Question about Sigma APO 50-500mm F4-6.3 EX DG/HSM Lens

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Soft focus 3 year old lens will not focus sharp at 500mm anymore. I've taken a lot of pictures with this lens with no real problems until now. I've tried it on other canon bodies with the same results. Its just a soft focus. Never been dropped. If not mounted it's in its case. Also the finish did not hold up, it started peeling off right away. I'm wondering if it can be fixed, or if its worth it.

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I would say it is fixable. It could be a couple of different things. Loose optics and/or mount spacing could be the problem. Check here on Fixya to find a repair person in your area.

Posted on Mar 01, 2008

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Posted on Jan 02, 2017

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1 Answer

Auto focus will not work on my canon 40d


First of all you need to clean the connectors on both the lens and the camera. Do this by using a pencil eraser being careful not to get bits in the camera or lens. If this doesn't clear the problem is it that auto focus doesn't function with any lens. If that is so then you need a camera repair. If auto focus is only non functional on the Sigma 170-500mm and you can manual focus then the probable problem may be a broken ribbon cable in the lens itself. This will need to be replaced. Usually a quick and relatively cheap job.

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1 Answer

The lens does not focus manually or automatically.


Hi.
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.

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WHAT ADAPTER DO I NEED TO USE VIVITAR 500MM ON MY CANON 450D


i bought one lens oh this and till now i could not focus ny shoot :( in manual can you help me ... i've got a sony dslr a300

Feb 20, 2012 | Canon Cameras

1 Answer

What are the best settings to use the Opteka 500MM Mirror Lens with a Pentax K-7. Also when you you add the 2.0X teleconverter with this lens?


These big lenses are very slow and cannot deliver much light to your camera. Obviously, you can't open the aperture any wider than f8 as specified by the lens itself. In the old days, most inexpensive cameras were fixed focus at f8 with a shutter speed of 1/100 sec. That's a good place to start with this lens without the doubler.

If the pictures are too dark, you can't open the lens any wider so your only option is to reduce the shutter speed.

That means that motion of the shooter or the subject will be more inclined to cause blurring so you need to be shooting from a tripod with a remote shutter release and/or a delayed shutter release setting.

If the test picture is too light, I would first reduce the lens opening to the next stop, f9 or f11, then shoot another test shot. You could also increase shutter speed, or both o reduce the light reaching the camera sensor. Keep shooting test shots until you get the exposure you want.

Once you add the doubler, you compound this situation because it will further reduce the lens speed by about 2 f-stops, meaning that you have to start your tests at f-11 at 1/100 sec. or f-11 at 1/50 sec. This gives you far less flexibility to properly adjust exposure.

Further, you will have increased the magnification so much that a slight breeze or a fly landing on the lens can cause vibration and blur the picture.

Before you shoot any serious pictures, you need to experiment with this lens so that you know exactly what its capability is.

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2 Answers

Opteka 500mm f/8 mirror lens for my DSLR and it's says no lens


You need to turn the mode dial to Manual (M). You won't be able to use the camera's built-in exposure meter at all with this lens. You can take an exposure reading with another lens to use as a starting point, then review the pictures and histograms to fine-tune the exposure.

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1 Answer

Sigma 50-500mm auto focus problem


Hi is the manual focus working from inf to close focus and not stoping then it needs a new hsm motor

Jun 07, 2009 | Sigma APO 50-500mm F4-6.3 EX DG/HSM Lens

1 Answer

Vivitar telephoto lense 500mm


Yes and no. If it doesn't come with one, you'll need a T-adapter for Nikon in order to mount the lens (you can get one from Vivitar, as well as from other manufacturers). The lens is not an autofocus lens, so obviously you will have to focus manually. It's also a mirror lens so it has a fixed aperture. It's what Nikon classifies as a non-CPU lens, so you cannot use the D90's exposure meter. You will have to shoot in Manual mode.

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2 Answers

500mm lens will not function with my Canon digital Rebel XT.


This lens will work with Canon cameras. I use one on my Canon 30D. It is a fixed F8 you can not use auto or green box because there are not any contacts on the lens to talk to the camera. Its back to the basics manual adjust shutter and ISO to the get a correct exposer. DEFINITLY NOT A POINT AND SHOOT LENS.

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