Editorial Review:Product Description:The Canon EF 100mm f/2.8 Macro USM Autofocus lens is suitable for macro photography up to life-size (1x) magnification. Inner focusing affords a long working distance of 5.9 inches to infinity.
Amazon.com Product Description:Bring small things into full-sized view with the Canon EF 100mm macro USM lens. Macro lenses can uncover detail that would be impossible to detect by the eye and give new perspective to extremely minute subjects such as insects or the petals of a small flower, and this lens is no exception. The lens offers such features as a three-group floating system for exceptional close-up performance; a secondary diaphragm that blocks stray light at f/2.8, which increases contrast when shooting wide open; a ultra-sonic monitor (USM) that provides outstanding autofocusing speed at all focusing distances; a wide manual focusing ring with smooth action; and full-time manual focus even in AF mode. The first lens in its class to feature inner focusing, the lens carries a one-year warranty.
- Focal length: 100mm
- Maximum aperture: 1:2.8
- Lens construction: 12 elements in 8 groups
- Diagonal angle of view: 24 degrees
- Focus adjustment: Inner focusing system with USM
- Closest focusing distance: 1 foot (film plane to subject)
- Filter size: 58mm
- Dimensions: 3.1 inches in diameter, 4.7 inches long
- Weight: 21.1 ounces
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Customer Reviews
Average Rating:

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amazing for tiny objects and portraits!
Can't beat this lens for detail shots! I use it for close ups of wedding rings etc at weddings and it makes a killer portrait lens as well. One of the best purchases I have made for my lens bag.
Rating: 
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Dreamy macro, versatile.
Although this lens is intended for macro photography, it's also a great lens for general purpose shots, or portrait shots. The lens produces beautiful sharp images and is a fast, accurate focuser. The lens is moderately heavy and bulky, so I wouldn't classify it as eminently carryable, and without image stabilization, you might suffer hand shake blur if you're not shooting at the wide end; at smaller apertures, using it with a tripod is highly recommended. But if you're buying it primarily to get into macro this shouldn't much matter as tripod shooting with macro is virtually a necessity, and completely expected.
The 100mm focal length is a nice compromise when you want to get close to small subjects (particularly insects) but are limited to how close you can get before scaring the subject off - as a comparison with the 180mm macro, you would want to factor in a consideration as to what you might like to shoot most of the time - big spiders that you'd rather stay well away from might be an application more suited to the 180mm, for instance, but if you are keen to shoot mostly flowers, the 180 might be more length than you really need.
In short, the 100mm macro is one of my "keeper" lenses, a real performer.
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Great Macro lens
This lens works great for food photos. I've hand held this lens when shooting and used a tripod, all of the shots turned out great.
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Beautiful
I am pretty new at the whole Photography art, but this lens is simply beautiful. It gets color, light and focus near perfectly. Best lens I have by far.
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I LOVE IT!!!
All I have to say is-This lens will make photos limited only by my skill and imagination. Alright, I need to make more points than just that. This lens is the best for showing great details in your photos. It's amazing! However, why it didn't come with a hood?