Question about Sigma APO 70-200mm f/2.8 EX DG HSM Lens

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Darkened Images Every time I use my camera now to take sports pictures, after taking a couple of pictures everything gets really dark. I can't see through the camera and the pictures that are taken are really dark which you can't see anything in. This has just started to happen recently. I've had the lens for over a year and it has worked fine up until a couple of weeks to a month ago.

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Re: Darkened Images

Sounds as if your diaphragm may be sticking due to either the camera or the lens. Look at the back of the lens and work the small tab with the aperture ring set to f32 (or 22). See if the tab moves smoothly but with resistance from a spring, or if it sticks or moves roughly. If it does this with other lenses too, another possibility is the aperture lever on the camera. Mount the lens and set it for f22 or so and use your depth of field preview to see if the lens is stopping down smoothly. In either case it may need professional repair.

Posted on Nov 03, 2007

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The T-mount is a universal thread developed by Tamron which allows various adapters to couple a lens to a wide variety of camera brands. If a lens is listed as having a T-mount, it means that the lens can be coupled to your camera if you have a T-mount adapter for your camera.

A 2X teleconverter (often called a doubler) enables a lens of a specific to be doubled. For example, the lens referenced above actually is a 650-1300 lens but with the 2X teleconverter the focal length can be doubled to a maximum focal length of 2600.

I have an Opteka 600-1200 telephoto lens which I consider to be a decent lens for its very low price. I also have a doubler which came with my camera kit. That means I can increase the focal length of my lens to 2400 but I cannot imagine any reason to do so. At it's full zoom 1200mm focal length, this lens is very difficult to handle and must be used on a tripod with a remote shutter release.

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The lens is also large and does not fit conveniently in a camera bag so it rarely goes with me unless I know for sure that I will need it. It is not particularly good for sports action shots because the action will be over before you are ready to shoot the picture. With very bright light (such as the mid-day sun) and pre-planning and pre-focusing you might be able to get some interesting sports action shots. Say you're at an automobile race and you know a car will be coming into view at a certain spot, you can set up for that spot then trip the shutter when the car pops into view.

All that being said, I think this is a good lens to have in my bag without spending $10,000 plus for a really good lens of this size.

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When I look through the viewfinder, everything is very dark, I can barely see what I am trying to focus on. The auto focus does function but it is hard to determine what I am looking at. I can take a...

Sounds to me like the aperture diaphragm on the lens is stuck in a small opening position. If you detach the lens from the camera and look through it, is the whole opening light or just a small dot in the middle? The diaphragm can stick if it gets a drop of oil on it.

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Hey caturner7,
If you have a large family and you are having a difficult time fitting everyone in the frame then a wide angle lens might be exactly what you need, but this will probably not make your images any sharper. The most common cause of blurry images is the camera is moving during exposure. Even the slightest camera shake can cause blurry images. There are multiple solutions to this, first make sure the shutter speed is high enough, then make sure the ISO is set to about 400, and then make sure the flash is on. Another cause of this could be that the camera is not achieving focus so make sure you are pressing the shutter button down halfway so the camera can achieve focus before you take the picture. A slightly telephoto lens usually produces the most pleasing portraits. I hope this helps!

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Typical situation in Shutter preferred mode. I have the shutter set at 1/125 of a second and the f:stop is f:3.5. When I zoom out to 200mm, the shutter speed is still 1/125 of a second, but the f:stop is now f:5.6 and I have decreased exposure (darkened the picture) by almost 2 full f: stops.

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