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Message: <blockquote data-quote="J-see" data-source="post: 421039" data-attributes="member: 31330">I know I can only get the 70-300mm going at the shortest end IF there is enough light. Else even that doesn't work and she keeps hunting. Manually to get a sharp shot, I need to push it to f/11 at the long end. It's with the TC2.0 but it gives an idea what will be required for the Tam.The Tam only starts getting sharp at f/6.3 and very good between 7 and 9. If I'd add a TC to that, even if a 1.4, I'd need a whole lot of light, not to mention a very fast shutter. 600*1.4*1.5 for a DX or 600*1.4 for an FX. Minimum. Tripod maybe it would work reasonable well but for handheld shooting you'd need close to perfect conditions. I know I gave up using the TC on the 70-300mm because my ratio of good shots was depressingly low handheld and that was only at 600mm.</blockquote>