Here is a first test shot from the Vivitar 600 Solid Cat. MFD is 23 ft and this is with the R5 at ISO 10,000 (dark day), but it looks like the 600 is much sharper than the 800 and may be OK on the R7. Still not ideal for hummers due to MFD but may turn out to be useful after all. Interested to see what a sunny day reveals.


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