Funny thing is you can buy an Olympus DSLR with a crop factor of 2x and a Sigma 300-800mm f5.6 lens (which BTW has absolutely superb optics) and you have a 1600mm Effective Focal Length camera and the total cost is less than $10,000.
So its not just longer FL and has the same speed but it weighs a lot less !
IMO that makes it better !
Cheers Rally
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