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Sigma 50-500mm f4-6.3 EX APO RF HSM

Review Date: Aug 9, 2008 Recommend? yes | Price paid: $932.00 | Rating: 9 

Pros: 500 mm reach, quality optics, build quality, tripod mount design, versatile zoom range and great price
No IS but I knew that, AF sometimes hunts

It is heavy but in a good way. The weight enables me to hold it good and steady. I am delighted with the quality of the optics and the build and design of the lens. The tripod mount and ring were included with the lens and are quite useful. I carry this lens on my camera, a 40D all over the place using the mount as a carrying handle and the weight is no problem. The mount is useful for hand holding as well. I was fearful when I bought this lens I would regret not having the IS. I am very pleased with the number of keepers I am getting. I also was skeptical of image quality where sharpness and detail were concerned. Again, that is not an issue. Sigma has designed a very nice lens for a downright great price. I have had a problem on two occasions where the lens suddenly would not focus past about 200 mm. After taking the lens off the camera and then remounting it, that failed to solve the problem. I t began working after 5 or 10 minutes of time but I never pinpointed the problem either time. I ONLY mention this because I have yet to determine if this is a lens problem or possibly a problem with the camera. I highly recomend this lens to anyone interested in a zoom for wildlife, birding, portrature and or even some landscape. A monopod would serve most people well. My best pictures have been shot at f9 or abobe . However one last point, even wide open the images are real good. I like this lens bokeh.

Canon EF 100-400mm f/4.5-5.6L IS USM

Review Date: Jul 24, 2005 Recommend? yes | Price paid: $1,400.00 | Rating: 9 

Pros: Focal length range, Wieght, Detail, IS Works, Contrasty color, Build quality and a bit of an Awe factor
Bulk, Requires lots of light

I bought this lens knowing it was big and heavy so for me to list the "Bulk" as a negative is just to let you all know it is so. Unlike some others I like the weight as it helps steady the camera. I find the level of sharpness to be very good. The more light you have the better the output and this lens does like light. The push pull zoom takes some practice but works just fine. I use the tighten/loosen ring often with good success. I have not noticed a "dust vacuum" effect yet. I keep this lens on my camera 90% of the time. It deserves the "L" desigbation based on build quality and output of images. NOTE: I believe Canon is guilty of being quite inconsistant in their quality control. These people who claim their copy is soft are likely tellingit like it is with their copy. My copy is sharp. Who knows about the next persons? That is a shame.