Well, I'm going to jump in here because I have a similar experience with a 70-300mm "L" lens.
As a bit of background, I grew up with Speed Graphic and Linhof 4X5 cameras, so I KNOW what SHARP is. When 35mm became popular I shot with Nikon film cameras and medium zoom lenses.
A number of years ago I made my foray into digital photography by buying a Rebel Xsi (450D) with the 18-55mm "kit" lens. I then bought a 55-250mm "kit" lens for my sports photography.
I was never really satisfied with image sharpness, but just attributed it to the "cheap" camera and "kit" lens.
I have been thinking about upgrading my body for some time but was waiting for the 7D upgrade (it's the only one Canon has not yet upgraded). In the meantime, I thought I might try an "L" class lens. After much thinking about what I wanted to get I thought the 70-300 would be great for my soccer and lacrosse photos.
Well, I took delivery of the lens yesterday, slapped it on my Rebel, attached my B&W UV filter and excitedly headed for the field.
Imagine the SHOCK that greeted me when I opened iPhoto. Out of 800 images I shot at the game, less than 10% were what I would consider "acceptable". Soft, out of focus images were the norm. Of the ones I kept the best I can say is that the images are "soft". In fact, in many of the images I can't even find a point of focus. Yet I could hear the motor (very quiet, BTW) churning away in auto-focus mode.
I have to agree with the responder who wasn't satisfied with the higher shutter speed "solution" proposed by another responder. I shot all these images in Tv/AI Servo/Multiple shot mode @ 250sec. Most of the images were F11 or better @ ISO 800 or 1600. Short of moving the game to the surface of the sun I'm not sure how much more I can do with camera settings??
I am beginning to believe that the only way to achieve sharpness in photos is to move to a $50,000 Hasselblad - because I HAVE seen sharp images in magazines. I don't know, maybe it's not POSSIBLE to get sharp images with less expensive digital cameras - maybe it's a limitation of the technology?
How much money do I have to spend to get great photos - you know - the Ansel Adams kind? I've certainly seen great quality photos on the web, but maybe that's a limitation of the medium - just like the newspaper medium tolerates "soft" images.
And don't talk about sending the lens to Canon for "recalibration" - you mean they sell crap, but will "fix it". I can't tell you how prevalent that mindset is today. Do an OK job, and then come back and fix the problems until you get it right. Whatever happened to get it right the first time? Maybe that went out the window with the jobs that got sent overseas?
I'm beginning to rethink my preorder of the 6D. Maybe I'd just better start saving MORE money to throw at a Hasselblad.




