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I just got my 7d and have been shooting a 20d for years. I have always had a battery grip on it for the vertical release and just a little more mass, it has a real Canon grip. I just cannot justify the money for a real canon grip on the 7d. I have used Opteka stuff before, I am thinking I will go with theirs unless there is a good reason not to. I do not think lens weight will be an issue with the mount, I own L zooms up to the 80-200/2.8 and sometimes rent a 300/4 IS or 400/4.5.
Let me know your thoughts please.