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I'm looking to pickup a telephoto lens with a EF or EF-S mount, the hard price limit is $700. The local camera shop has a Canon 70-300mm 4-5.6 IS USM for $650. They have a Tamron 28-300mm 3.5-6.3 for ...

I know the 70-200 will be more convenient to have...but how about image quality (say at F4 and beyond), will it be very close to the prime? I will be using it outdoor so low light performance is not ...

Just like with any 2x teleconverter, the focal length of the attached lens is doubled, with a consequent aperture reduction of two f/stops. As such, a 70-200mm f/2.8 zoom effectively becomes roughly a ...