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Old 1st March 2008
photo_owl photo_owl is offline
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Re: EC-14 for Walkabout

Originally Posted by Pjphoto59 View Post

I would be wary of using it with the 70-300, which I think has a max. aperture of f5.6 (at the long end). With the EC-14 your max. aperture becomes f8, so it must be dark for viewing and a challenge for the focussing. This is partly why I am thinking of an EC-14 rather than an EC-20, with my my 14-54 and 50-200 I will get a max. aperture of f5.6, rather than f8...

Thanks for your comments.
you will get a max aperture of 4.9 with the ec14 and the 2.8/3.5 lenses

personally I feel I can almost ignore the ec14 when it's in use where I have to think about the ec20 even wide open!

the 510 (and 3) seem more than happy to focus the 3.5s with the ec20 and the 5.6s with the ec14

Ian raises a good point about diffraction - but I would hate to think it was significant below an effective f11 in any circumstances
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