Minolta 300mm 2.8 with 2x convertor

Read this http://kurtmunger.com/300mm_zoom_and_prime_shoot_outid217.html which will get you started, although it is the Sony 300mm rather than the Minolta - since you haven't said which variant of the Minolta I'm going to guess it is not the SSM variant, which the Sony is a copy of.

I have the Minolta 300/4 and 2x converter but not either of the lenses you are talking about.
 
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