A good thread subject Rob as this is something a lot of people think of to increase focal length on a budget.
I found similar results when using a 2x with the 80-200, and that was a sharp lens when used on its own, hence the reason for swapping it for a straight 400mm.
Rubbish weather this week so I have time to think of a target as I don't have a sawn log end handy. Then I will see if I can post some comparison shots with mine and a couple of lenses.
Don
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