The Tamron 17 50mm lens is a very pricey item. The item can cost one hundreds of dollars, however, one might be able to find the item cheaper on Amazon or eBay.
The 50mm 1.4 is better, but it depends on where you use it for. And of course how much money you wanna spend on it!
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most sensors on digitals are much smaller than 35mm film frames, so the lens of 50mm acts lika a telephoto one.
The iris, which sets the working aperture, is located inside the lens. The aperture numbers are a ratio of the length of the lens to the diameter of the front element, or the amount of the front element the iris is allowing to be used. Let's say you had a 50mm f/2.0 lens. The aperture of the lens with the iris wide open is 1/2 the focal length, or 25mm. If you also had a 100mm f/2.0 lens the front element would be 50mm in diameter, and a 1000mm f/2.0 lens would have a 500mm front element. (It would come with a free forklift, but that's a different story.) If you set the aperture ring to f/4.0, your 50mm lens would bring in as much light as one with a 12.5mm front element, the 100mm lens would act like it was 25mm in front and the 1000mm lens would act like it had a 250mm front element, but you'd still have to lug it around.
The focal length of a camera's lens refers to the the magnification or telephoto power of the lens and is expressed in the millimeters of the lens, like 100mm, 300mm, etc. www.goldprints.com
They cost about $15 per lens. This is about the same as most areas.
It'll cost you around 400$ to get a good telescopic lens,but it's not all that easy to find an exact fit for any camcorder.
50mm
50MM Dollars.....
good question you should find out and tell me
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it should be around $135-$140 ☺