There is some truth to that reputation (which is odd, the large throat size of 
the EF mount and shorter register should allow for better better performance 
than is achieved by Nikon, Olympus, Carl Zeiss and Leica). The real issue is 
the poor edge sharpness on FF bodies of the Canon lenses that go wider than 
24mm (Canon's 24mm's are quite good). This is especially noticable with the 
17-40L and the 20mm f2.8, which are superb performers on the cropped bodies. 
Oddly, the sole exception to this is the EF-S 10-22, which has some distorion 
issues (odd mustache distortion at the wide end), but is a superb performer 
otherwise.  

I personally shoot some Canon film kit, but mostly as a platform for M42 lenses 
(And Leica R soon, I recently acquired an R-EOS adaptor) and the only Canon 
lens I currently own is the plastic fantastic 50mm f1.8 II (Great lens for the 
money, but it's really crappy build quality).

-Adam



P. J. Alling wrote:
> I've heard the Canon WA lenses especially WA Zooms have considerably 
> more light falloff, (and corner softness), than most any other major 
> manufacturer.  It's not fair I know, but my only direct comparison is 
> the Canon EF-S 18-55 which a miserable little excuse for a lens compared 
> to my smcp FA 20-35 f4.0.  (Yes I am comparing a FF lens against an APS 
> only lens, a DA 18-55 would be a great direct comparison, but I don't 
> have one).  But who wants to be fair anyway?
> 
> Christian wrote:
> 
>>Mark Roberts wrote:
>>  
>>
>>>P. J. Alling wrote:
>>>    
>>
>>  
>>
>>>>>For those contemplating FF at this point :-).
>>>>>
>>>>>http://www.ejphoto.com/1ds2_vs_5d.htm
>>>>>        
>>>>
>>>>What do you expect form Canon WA zooms?
>>>>      
>>>
>>>:)   I expected worse, in fact. Considering these are wide angle zooms 
>>>wide open they did pretty well. I'd be interested in seeing performance 
>>>when stopped down.
>>>
>>>
>>>    
>>
>>I'd like to see performance on slide film with those lenses....  As I 
>>recall, light falloff wide open is "normal" for WA zooms even on film/slide
>>
>>
>>  
> 
> 
> 



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