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FORUMS Cameras, Lenses & Accessories Canon Lenses 
Thread started 09 Jan 2006 (Monday) 14:35
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300mm lens

 
jerrythesnake
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Jan 09, 2006 14:35 |  #1

Hi all, dont mean to sound thick but cant seem to work out the total focal length of a 300mm lens on a 20d with a 1.4 converter. thanks for any help , Jerry:oops:


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canon 7d canon 300mm 2.8 canon 100mm 2.8

  
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tommykjensen
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Jan 09, 2006 14:37 |  #2

420 mm (300 * 1,4).


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tommykjensen
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Jan 09, 2006 14:38 |  #3

If You mean including the 1,6 crop factor in the 20D it comes to 420 x 1,6 = 672 mm


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jerrythesnake
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Jan 09, 2006 14:39 as a reply to  @ tommykjensen's post |  #4

tommykjensen wrote:
If You mean including the 1,6 crop factor in the 20D it comes to 420 x 1,6 = 672 mm

Many thanks Tommy:)


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GyRob
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Jan 09, 2006 15:59 |  #5

i think he means 300x 1.4 x 1.6 crop = 672mm
Rob.


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GyRob
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Jan 09, 2006 16:03 |  #6

sorry tommy didnt see your reply :(
Rob.


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