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DIFFERENCE BETWEEN ORDINARY ZOOM AND TELECONVERTER LENS



 
 
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  #1  
Old February 15th 05, 07:14 PM
R.Satish
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Default 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
  #6  
Old February 20th 05, 06:32 PM
rob
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In message - Wolfgang Weisselberg
writes:
:
: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

Plus, on many camera's combinations you'll either lose AutoFocus or AF will
slow down considerably.

Rob
www.rcp.ca

  #7  
Old February 21st 05, 01:21 AM
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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.

  #8  
Old February 21st 05, 05:38 AM
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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

  #10  
Old February 21st 05, 05:40 AM
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In message . com,
wrote:

On cheap cameras AF is limited within f/5.6.


$1500 is cheap?
--


John P Sheehy

 




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