Love that shot!...although I am not really a cat person, they are so fun to watch at that age. That is a lens I want....I think I will get it over the Sigma, the reports seem to say it is a little better, and your shot here is certainly plenty fine.
Otis sends his regards and wants to help you out a little if he can.....
If it has these,it is a female.....
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If it has these, it is a male.....
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He says there are exceptions...but he doesn't want to discuss them here.....
Best Regards & have fun with that great lens!