I've been using a 70-200 F/2.8L IS
and an EF
2x Extender. I find that mine needs to be stopped down to F/9.0 to give acceptable results. In other words it gives just adequate results at F/9.0 but I find that it is a poor performer at bigger apertures. Don't dream of similar results as you get from the 70-200 F/2.8L IS
without the extender. I've read that the EF
1.4x Extender works much better with the 70-200.
I also have the 17-40 F/4L but I am thinking about selling it. It is a great walkaround lens but I find that I am using my EF
50 F/1.4 much more often even though it costs me more trouble to frame the shot and of course much narrower field of view. The 17-40 F/4L is a very impressive lens but if you like to take photos with available light the F/4 is very limiting.
And since I haven't plugged for a long time here is one I took with my 300D and EF
50 F/1.4 (amazing lens...the 50 F/1.8 is also very good and probably the biggest bang for the buck in the Canon EF
lineup...a must have)
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Photo © Sigurdur Benediktsson