Tele-extender or cropping?

Started 10 months ago | Discussions thread
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athleticpete
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Tele-extender or cropping?
10 months ago

I have a teleplus 2x extender which I have used occassionally with mixed results on a Canon 40D and 70-300 zoom. I don't like fact that AF does not work or is extrememly slow so therefore it is only used in extreme circumstance.

I have just treated myself to a Sigma 120-300 f 2.8 zoom so thought I would give the extender another try. The AF works reasonably well and I can manually focus if necessary but now I can really notice the difference with and without the extender. Without the extender at full 300mm zoom pictures are pin sharp, but with the extender, even at 150mm there is a definite loss of quality.

An example without the extender at 1/2000s focal length 250mm

Since I am also considering upgrading my body to a 7D I wonder if, with the increased pixels of the 7D, would I get better picture with a 2x digital zoom in photoshop, rather than the 2x optical zoom on camera. i am sure it would work for small prints, but what about A· size, or larger.

Any thoughts

TIA

Pete

valenciabioparc.wordpress.com

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