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DIFFERENCE BETWEEN ORDINARY ZOOM AND TELECONVERTER LENS
hello
can anybody tell me the difference between an ordinary zoom lens and a teleconverter lens. what makes a teleconverter cost 4 times that of an ordinary zoom lens. also please tell me what is the difference between a macro lens and an ordinary lens |
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Michael Weinstein wrote: On 2005-02-15 13:14:39 -0500, (R.Satish) said: hello can anybody tell me the difference between an ordinary zoom lens and a teleconverter lens. what makes a teleconverter cost 4 times that of an ordinary zoom lens. also please tell me what is the difference between a macro lens and an ordinary lens A teleconverter is an add-on that fits between the camera and the lens and multiplies the focal length (usually doubles it). It also effectively halves your f-stop so that an f/3.5 lens is effectively maximum f/7. It is not a zoom, there is no variable focal length UNLESS you use it on a zoom lens (which you can do). Only the very best teleconverters are worth using because they generally degrade the image quality. I cannot imagine why a teleconverter would cost "four times" what a zoom lens costs. A macro lens focuses down very close and is capable of making images 1/2 actual size to actual size (1:1) depending on the specific macro lens. -- Michael |Pay no attention to that man behind the curtain! Thanks Mr.Michael . I would also like to know if Cannon has relesed an advanced version of Epoca 135 |
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Michael Weinstein wrote: On 2005-02-15 13:14:39 -0500, (R.Satish) said: hello can anybody tell me the difference between an ordinary zoom lens and a teleconverter lens. what makes a teleconverter cost 4 times that of an ordinary zoom lens. also please tell me what is the difference between a macro lens and an ordinary lens A teleconverter is an add-on that fits between the camera and the lens and multiplies the focal length (usually doubles it). It also effectively halves your f-stop so that an f/3.5 lens is effectively maximum f/7. It is not a zoom, there is no variable focal length UNLESS you use it on a zoom lens (which you can do). Only the very best teleconverters are worth using because they generally degrade the image quality. I cannot imagine why a teleconverter would cost "four times" what a zoom lens costs. A macro lens focuses down very close and is capable of making images 1/2 actual size to actual size (1:1) depending on the specific macro lens. -- Michael |Pay no attention to that man behind the curtain! Thanks Mr.Michael . I would also like to know if Cannon has relesed an advanced version of Epoca 135 |
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Michael Weinstein wrote:
On 2005-02-15 13:14:39 -0500, (R.Satish) said: can anybody tell me the difference between an ordinary zoom lens and a teleconverter lens. what makes a teleconverter cost 4 times that of an ordinary zoom lens. A Canon EF 1.4x or 2x extender (teleconverter) costs $279.95 at bhphoto.com. Please show me a zoom lens for $70 with an acceptable image quality. also please tell me what is the difference between a macro lens and an ordinary lens A teleconverter is an add-on that fits between the camera and the lens and multiplies the focal length (usually doubles it). Usually, you can get 1.4x teleconverters and 2x teleconverters. They enlarge the image (and thus any fault in the lens itself, too). The 1.4x gives you 40% more focal length for 1 step of apperture, e.g. a 70-200mm f/4 lens becomes a 98-280mm f/5.6 lens. With quality lenses the quality degradation is reputedly slight --- especially if the sensor/film and not the lens is the limiting factor. A 2x teleconverter doubles the focal length for two steps of apperture, e.g. a 70-200mm f/4 turns into a 140-400mm f/8. The quality degradation is very noticable and you don't want to use them outside exceptional situations. You can combine teleconverters for even more degraded images. -Wolfgang |
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rob wrote:
In message - Wolfgang Weisselberg writes: :A 2x teleconverter doubles the focal length for two steps of :apperture, e.g. a 70-200mm f/4 turns into a 140-400mm f/8. :The quality degradation is very noticable and you don't want to :use them outside exceptional situations. On a good lens, 2x still produces good quality. Plus, on many camera's combinations you'll either lose AutoFocus On cheap cameras AF is limited within f/5.6. So to keep AF, you should only use a Canon 2x on a f/2.8 or better lens. |
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In message ,
Wolfgang Weisselberg wrote: You can combine teleconverters for even more degraded images. With some lenses, a 2x and 1.4x stacked are still limited mainly by the sensor (probably completely with a D30 or 1D). The Canon 300mm f2.8L IS and 500mm f4L are two examples. -- John P Sheehy |
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