Some comments on the RF 800 f/11 versus the 100-500mm. I picked up a used but absolutely mint copy of the 800 that I have tested in the field on birds and at home with charts. I do like the lens very much. To summarise briefly, it outresolves the 100-500mm + RF 1.4x at 700mm. Put the RF 2x TC on the 100-500 and the situation changes. At 1000mm, the 100-500mm outresolves the bare 800mm f/11 on charts and in the in field. Put the RF 1.4x on the 800 to give 1120mm, the two lenses are very well matched - the 1120mm may resolve a teeny bit more on charts but the 1000mm seems slightly sharper in the field. Putting the 2xTC on the 800mm to give 1600/22 is a waste of time compared with the 1.4x. The big downside for me is the 6m mfd of the 800mm, which hinders my photographing dragonflies and butterflies. If you don't have the 100-500mm, then the 800mm f/11 is a very cheap way of getting a prime that matches the 100-500mm at long focal lengths. If you do have a 100-500mm, then you have to weigh up how much you would use the prime. So, I now have the dilemma of whether to keep it or sell it on.
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