I've got a 70-200 f/4, and thinking of getting an extender. What do they do to the aperture and autofocus?
I'm still kinda new to this whole thing 
BiikeMike Senior Member  656 posts Joined Aug 2006 Location: Richmond, VA More info | Sep 10, 2006 19:22 | #1 I've got a 70-200 f/4, and thinking of getting an extender. What do they do to the aperture and autofocus? 30D w/Grip; 10Dw/Grip; 70-200 f/4 L; 17-40 f/4 L; Canon 50mm 1.8 II,; Tokina 10-17 f/3.5-4.5; 580EX, 430EX. lotsa' memory, lotsa' batteries. Macbook Pro 2.16 15" w/2 gigs RAM. Mac Pro 2.66 Quad w/5 gigs RAM. Adobe CS3/Lightroom
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winkie Goldmember  1,067 posts Likes: 2 Joined Jun 2006 Location: Fargo, ND More info | Sep 10, 2006 20:08 | #2 |
calicokat Cream of the Crop  14,720 posts Likes: 2 Joined Oct 2005 Location: Southern California More info | Sep 10, 2006 20:12 | #3 A 1.4x extender is going to give you a focal length 98-280 and an apeture of F/5.6. You can still autofocus on all Canon bodies. 2x extender gives you 140-400 with F/8.0. Only 1 series bodies are going to allow autofocus. "You are going to fall off a cliff trying to get a better shot someday"- My hopeful and loving wife
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morehtml Goldmember  2,987 posts Likes: 1 Joined Aug 2005 Location: Murfreesboro, TN More info | Sep 10, 2006 20:40 | #4 On that lens you are at most going to want the 1.4XTC. The 2XTC is going to lose your autofocus unless you have a 1 series camera and the 2X will probably degrade image quality more than you want on that lens. ---------------
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