Funky solution!

[tikkeltokkel]

Last i went to this forum and couldnt decide about a 24-70 or 17-40 ... I think i'm going with the 17-40 now but had this idea today, tell me if i'm wrong. I'm going to have a 1.4x converter sometime anyway so i'll get the converter and the 17-40 .... use them together for the "in-between" "lens" for now .... AWESOME!!!!

[Jeppe]

hrmmm... well first of all.. Canon EF 1.4x does not work on any zooms under 70mm. Second of all......sheeeeezez... this is the trick where the magician says.. : Kids, dont try this at home...


An extender/teleconverter is made for the longer focallengths (therefore the name is TELE).

Third and last.. get a beginners guide to photography and a book in the understanding series namely optics.

I can guarantee you that that combo wont be AWESOME!

(This might sound harsh, not my intention. But first you learn, then you teach)

Best regards

Jeppe

[CyberDyneSystems]

It simply won't work.

The tele-extenders will not physically attach to the 17-40mm.

There is nothing more to say.

Extender EF 1.4x II

This tele extender can be used with fixed focal length lenses 135mm and longer (except the 135mm f/2.8 Softfocus lens), and the EF 70-200 f/2.8L, 70-200 f/2.8L IS, 70-200 f/4.0L, and 100-400 f/4.5-5.6L IS zoom lenses. Superb optically, it preserves the image quality of the lens it's mounted to and multiplies its focal length 1.4x. Effective aperture is reduced by one f-stop; autofocus is possible on any EOS camera when combined with a lens having an f/4 or faster maximum aperture. The new version II maintains the outstanding optics of the previous version, and adds enhanced weather- resistant construction, and improved anti-reflective surfaces in the barrel.

And here,. check Sigmas compatibility chart. These converters are made for specific "Telephoto" lenses

http://www.sigmaphoto.com/html/pages/ConvComptChart.htm