250mm lens options?

Vivitar is a bit heavier, faster maximum aperture, has macro capability, it's well regarded lens especially Kiron version (serial number of the lens starts with 22)

samples i took with Vivitar S1 70-210mm/3,5 version made by Kiron

http://forum.mflenses.com/testing-my-lenses-part-88-vivitar-series-1-70-210mm-3-5-t48154.html

links to samples made with almost all my manual lenses:

http://forum.mflenses.com/wolverinex-testing-my-lenses-series-link-list-t39524.html

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my gear:
E-M5+45mm/1.8
E-520+12-60+14-42+70-300+Sigma 105 + FL-50R+EC20
and good amount of legacy lenses (list in profile)