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Title: Great Option For that Little Extra Reach
Review: I have used this with varying results with my Canon EF 28-70mm f/2.8"L" USM, Canon EF 70-200mm f/2.8"L" IS USM, & Canon EF 100-400mm f/4.5-5.6"L" IS USM. Always with a tripod and on manual focus. Its no substitute for a long prime. but it can be handy in a pinch.
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