Think about a 2X or 3X teleconverter too Grant. Or another lense in the 135 - 200 range. 50mm to 2000mm is a big jump in focal length and there are lots and lots of objects that you will want to get closeer to than with a 50 but 2000 (even 1260mm (2000 with 6.3 Focal Reducer)) will be too close.
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