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Thoughts on these long lenses?

Correct me if I'm wrong, but the 650-1300mm does not have an adjustable aperture, correct? If that is true, you are always shooting wide open -- not the best for quality.
 
Reminds me of a Motown song about "Mothers Fathers Sisters Brothers", as of we did not get the meaning of MFSB.

Which reminds me of the old Memphis Slim song, "If You See Kay".