Canon 800mm f/5.6L IS USM Review
The-Digital-Picture have reviewed the new Canon 800mm f/5.6L IS USM lens.
“The 800 L is sharp wide open from corner to corner and slightly sharper stopped down to f/8. The biggest improvement from stopping down is the reduced vignetting, which is somewhat strong at f/5.6. Exposures at f/5.6 are generally at least 1/3 stop darker even in the center of the frame from what f/8 exposures are - this is the biggest negative attribute of this lens in my opinion (aside from the price of course). Images at f/8 are simply excellent.” 
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