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Re: I have a Nikon D-80 and I wish to buy a telephoto...
Hi, Sigma does make plenty lens option in both ranges you are looking at, you may want to consider a zoom lens that will work for you. What type of photography do you do? That will help determine your lens selection choices. keep in mind that it is more important to purchase the highest quality lens you can afford rather than several lower quality versions. If you are looking at a 300 mm lens to capture sporting events or nature photography you will have determine is it going to be daylight or low light because a lens that works in lower light situation will cost many times more than one with less capability. If you like the wide angle to take photos of interiors the same goes as far a price. You may also want to consider your camera's brand of lens, the Nikkor lens and even look a the VR lenes (vibration Reduction). There is an 18-200mm1:3.5-5.6 that is pretty versitile and will work in a lot of situations from portraits to full standing poses and take great interior shots. The VR lenses are a little more pricey but allow you to hand hold the camera for pretty slow exposures. I know that is a lot to think about but it's important not to waste you hard earned money on lens combinations that won't be useful for what you want to shoot.
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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.
You didn't specify which Sigma 70-300mm lens (Sigma has at least five different versions, and I'm not referring to the lens mount), but from the error message I assume the lens has an aperture ring. Turn the aperture ring to its smallest setting (largest f/number) and lock it in place. Control the aperture from the camera, the same way as on a lens without an aperture ring.
If the lens doesn't have an aperture ring, please reply to this post specifying the exact model of the lens. That's all of the numbers and letters around the 70-300mm, like AF, DGO, f/4.5, etc.
You have to make sure you bought the sigma lens with a NIKON mount. Sigma makes a Sigma mount as well as a Canon mount, of course neither of those mounts will work with your camera. Also you must also make sure your lens is the Sigma 70-300 HSM (/Hyper Sonic Motor) or it will not AF on the D40. I just bought this lens from Abes of Maine and I love it on my D40.
You don't say what sort of telephoto you want to buy or how much money you want to spend but basically anything longer than a 50 mm is regarded as telephoto.
A staring point for you maybe the lens listed below:
Nikon Telephoto Zoom 70-300mm f/4.5-5.6G IF-ED AF-S VR It importantly has VR or "Vibration Reduction" on it to reduce camera blur when hand holding telephoto shots. This is just a staring point... You need to work out what you want to photographCheersIan
You can also get a 1.4 or 2x teleconverter to further increase the power of a telephoto lens. However, the cameras are unable to auto-focus when the minimum f-stop exceeds f/8, which can happen when you use one (or both) of the teleconverters on these longer lenses, so you have to manually focus the lens.
You can also get telephoto lenses from other manufacturers such as Tamron and Sigma that are built to work with Canon cameras. However, the Canon lenses are generally regarded as the best quality.
The Penta K110D has a 1.5X crop factor so a 17mm lense would be the equivalent to 25.5mm (in 35mm standard), therefore may not give you a 103 angle view. You would not really notice that much difference between 17 and 18mm.