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Originally Posted by Frank Peeters
I forgot to mention that since my main interest in picture taking is waterfowl I expect to always be shooting at 500mm or more(since I have a 2x converter?) I was under the impression that since the lens is going to be at F6.3 or F8 (converter attached) the camera should be too.
Frank
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The lens will be at whatever you or the camera set it to, it has a variable aperture. If you set the camera to f16 (for example), the camera will set the lens to f16. The aperture of the lens is dictated bythe camera or the user (you). The limitation to this is that the aperture cannot go bigger than the figures specified by the lens manufacturer.
Als oremember that if you are using a 2x teleconvertor, that will reduce the maximum effective aperture of the lens by two stops. At the long end of the zoom range (f6.3 without convertor) will actually be something like f13. You will have serious problems with auto-focus not having enough light/contrast to work effectively with this aperture.
Regards,
Duncan