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Message: <blockquote data-quote="HermitIbis" data-source="post: 3503848" data-attributes="member: 128291">I see where your priorities lie and wish you find the perfect solution. Having used the Tamron 70-300 zoom for a while, the Sigma APO macro 400mm prime gave me more fun - sharp pictures, birds nicely separated from the background, and a short minimum focus distance of 1.60 meter. However, the weight of 1.40 kg was a little much to handhold - I am 57 years old and don't get younger. So I mostly used a monopod, and yes, it was a hassle. Better noise performance would be nice, here my present gear was a step back. I looked at the DxO website comparing many cameras. To improve significantly upon the Canon 650D's iso isn't cheap, unfortunately. Good luck.</blockquote>