I really enjoy using this lens. I considered the much more expensive Sigma 50-100, but it's that heavy and also three times larger. Instead I got this one. I'm glad I did! It weighs just over a pound and is comfortable for extended wear. Its autofocus is fast and almost silent in normal situations like portraits. As a 70mm portrait I am very satisfied! This is an extremely sharp lens so I prefer it to the faster but less sharp lenses I have. As a macro lens, it takes such fun shots. I have no issues with image stabilization as long as I can keep my shutter speed high.
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