Next lens purchase suggestion.....

[Mark Elberson]

Is there a big difference with the F2 & F2.8 light gathering ability?

f/2 is one stop faster than f/2.8 which means itwill gather twice as much light.

[sirhc_1]

Is there a big difference with the F2 & F2.8 light gathering ability?

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 &amp; 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?

[Brendan7]

Since you have the 85mm for portraits, get the Sigma 150mm macro. Also of interest might be the Sigma 180mm f/3.5, which is just as good as Canon's own 180mm but for half the cost. Check out Juza's review:


http://www.juzaphoto.com/eng/articles/sigma_180mm_macro_review.htm


brendan