I have just bought a Canon 100 - 400mm L MKI and wonder if I have a dud. I have rarely had issues with focus or sharpness with my previous Canon telephoto lenses (300mm F4 L, 70 - 300mm L and 70 - 200mm f2.8 MKII) but this 100 - 400mm L MKI seems way off. Admittedly, I have only had the lens a day so not discounting user error but as I have never had issues like this before looking for answers. I have uploaded some images to my Flickr account including two from my 300mm lens (an impala and a couple of ducks).
The images with the lens stopped down seem OK but I need to be shooting near to wide open which I had thought would be possible with this lens. The images are straight out of camera Jpegs but I do have the Raw files as well.
Would doing a manual focus adjustment help? It seems to me that wide open nothing is in focus (eg. the chimney) so maybe MFA won't help.
I have loved my other Canon lenses so am hoping that I can resolve this.
Thanks for your help.
Peter
The images with the lens stopped down seem OK but I need to be shooting near to wide open which I had thought would be possible with this lens. The images are straight out of camera Jpegs but I do have the Raw files as well.
Would doing a manual focus adjustment help? It seems to me that wide open nothing is in focus (eg. the chimney) so maybe MFA won't help.
I have loved my other Canon lenses so am hoping that I can resolve this.
Thanks for your help.
Peter
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