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Not quite sure why this started a conversation about a 300mm F2.8 and ended up with a 135mm @5.6 and a F10 MTO but anyway the 300mm F2.8 will need to be stopped down to about F4 for good results on FF camera .
I was happy with a Canon 300 F4L IS @F5 which are quite light weight and reasonably cheap .
It just comes down to what you will find the most use for a camera lens or a scope .
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