The Fuji 450 is very, very small, just 270grs, but it's f/12.5, one stop slower.
There is also another ultra-light choice that it's not often considered, the Symmar 240 convertible to 420mm f/12. It is an excellent portraiture lens !!! Single coated, but once it is converted it only has two groups, little flare. Very cheap...
70€, a bargain, IMHO this glass is superb for portraits:
And of course we have the cooke triple, the rear cell alone is not heavy and it is 476mm, but not that cheap...
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