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<blockquote data-quote="btrotter" data-source="post: 214071" data-attributes="member: 9206">I have been Googling for days on the differences between the lenses, and the Sigma lenses seem to be a little tricky. Some of their models have so many letters in the model that its hard to tell if the reviews you are reading are for the same lens. For instance, one of the lenses I was looking at was a 70-200mm F2.8 II APO EX DG Macro HSM lens. When I google that, I start seeing reviews for different lenses, some with I, some with II and some with nothing after the F2.8. Then there is the HSMI and HSMII. It is hard to tell which lens someone is reviewing unless they write out the model number exactly the way it is stamped on the side of the lens. Then the reviews themselves say things like &quot;The II is a big improvement over the I&quot;, but are they talking about the &quot;F2.8II&quot; or the &quot;HSMII&quot;? Either way, sorry for the tangent.I do prefer a F2.8 lens. Outdoors the F4 would be ok, but indoors when I am shooting gymnastics the lighting isnt always the best. I also like to play with the DOF when doing portraits, and the F2.8 helps with that.</blockquote>

[QUOTE="btrotter, post: 214071, member: 9206"] I have been Googling for days on the differences between the lenses, and the Sigma lenses seem to be a little tricky. Some of their models have so many letters in the model that its hard to tell if the reviews you are reading are for the same lens. For instance, one of the lenses I was looking at was a 70-200mm F2.8 II APO EX DG Macro HSM lens. When I google that, I start seeing reviews for different lenses, some with I, some with II and some with nothing after the F2.8. Then there is the HSMI and HSMII. It is hard to tell which lens someone is reviewing unless they write out the model number exactly the way it is stamped on the side of the lens. Then the reviews themselves say things like "The II is a big improvement over the I", but are they talking about the "F2.8II" or the "HSMII"? Either way, sorry for the tangent. I do prefer a F2.8 lens. Outdoors the F4 would be ok, but indoors when I am shooting gymnastics the lighting isnt always the best. I also like to play with the DOF when doing portraits, and the F2.8 helps with that. [/QUOTE]

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