I felt this lens needed image stabilization and without it it's basically useless due to the percentage of blurry shots. This is because at 100mm you need a shutter speed of at least 1/100 to shoot largely free of shake. So I'm looking at the L-aperture version of this lens, but it's out of my budget. Then I stumbled upon the EF-S 60mm/f2.8 lens and realized that it only needed a 1/60th shutter with no image stabilization and would be able to take stable shots, so I bought this lens and am a lot happier. 60/2.8 actually offers the same optical quality as 100/2.8 - it's great for both macro photography and portraits (especially if you have an external flash). Consider getting a 60/2.8 if you have a crop camera with this lens. For full frame users when using a tripod this lens definitely works compared to the more expensive L version, otherwise the f2.8L IS would be a better option. If you're serious about macro photography, a 180mm macro lens is best, and for portraits you have plenty of other options, including the excellent 85/1.8. But if you want both a macro and portrait lens for your FF, then that's pretty good.
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