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Canon EF 70-200mm f/4L IS USM

Review Date: Apr 19, 2014 Recommend? no | Price paid: Not Indicated | Rating: 8 

Pros: lightweight, center sharpness, focus speed
corner sharpness

This lens has a stellar reputation as a light weight tele zoom. I carried this is my bag for many years.

Overall I think the lens is very good. Center is sharp even wide open although there is some softness towards the corner. You can see 100% crops here:

However, I do not use this lens anymore and sold my copy. The reason is because the 70-300L f/4-5.6 is actually sharper with better corner performance. On top of the wider range, the 70-300L is of greater benefit to me (travel photography)

Canon EF 70-300mm f/4-5.6L IS USM

Review Date: Dec 28, 2011 Recommend? yes | Price paid: Not Indicated | Rating: 9 

Pros: image sharpness, build quality, compact size

I've been searching for a good tele-zoom to use in my travel photography and finally decided on the 70-300 L lens. This lens exceeded my expectations and is extremely sharp with IS that works very well. Before I got this lens, I used either the 70-200 f/4 L IS or the older 70-300 IS (non L) lens. However, the 70-200 always seemed to be too short and the older 70-300 had very poor image quality.

When I got the 70-300 L, I tested it thoroughly and my hope was that it would be close in sharpness to the 70-200 f/4 L which has received very good reviews. I was surprised to find that on a full-frame camera (5DII) that the 70-300L was actually superior to the 70-200 f/4: in the center their sharpness was similar but the 70-300L had much better corner performance. You can see 100% crops from the lens at

There is some chromatic aberration at 70mm (red fringing) and 300mm (blue fringing). For me, this is a relatively minor issue as it can be corrected easily in software.

Unfortunately the lens doesn't come with a tripod collar which would help improve stability for tripod mounted shots. Canon sells this separately for nearly $200, which seems outrageously expensive for item that should have been included.

Canon EF 24-105mm f/4L IS USM

Review Date: Aug 20, 2011 Recommend? yes | Price paid: Not Indicated | Rating: 10 

Pros: sharp, IS, very useful focal length range
vignetting, distortion, size

This is by far my most used lens and I have taken thousands (probably tens of thousands) of pictures with it. I will probably hang on to this lens forever -- it is that good.

The lens has some negatives like the f/4 max aperture, vignetting and distortion. However these are not necessarily big drawbacks for the type of photography I do (travel). I'm often stopping down anyway for DOF, and vignetting/distortion can easily be corrected in post processing.

Although I often stop down, the lens is still quite good wide open. Go to for 100% crops taken from the lens.

My only other comment is that the lens seems quite big especially with the hood on.

Canon EF 17-40mm f/4L USM

Review Date: Aug 20, 2011 Recommend? no | Price paid: Not Indicated | Rating: 6 

Pros: inexpensive, lightweight, sharp in the center
poor edge/corner sharpness

I was very excited about this lens because it fills a very useful range for travel photography. However, I've gone through two copies of this lens trying to find one that had good sharpness out the edges. While stopping down a lot helps, I remain unsatisfied. You can see crops on a full frame at