Originally Posted by Mark Elberson
f/2 is one stop faster than f/2.8 which means itwill gather twice as much light.
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Based on my gear profile, I rather keep the 70-200mm 2.8 L non-IS than trading it with a 135 F/2 L since I do have an 85mm 1.8 for low light & has an equivalent FOV similar to a 136mm lens on a full frame. So, which one to chose for my 1.6 crop camera? the EF-S 60mm, EF 100mm macro L IS, or Sigma 150mm macro?
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