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Originally Posted by robski
This is the problem when a 3rd party reverse engineers a solution. It is often their best guess of how it works. It may only work correctly for one configuration and not all.
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Exactly!
I am surprised how many people buy these not inexpensive 3rd party lenses when there is absolutely no guarantee that they will work with the next camera body you buy. You know the one ... 24 megapixels, 10 fps and almost no noise at 6400 ISO.
To top it off, the Nikon or Canon lenses have great resale value if you decide you need something different or want to upgrade further.
That said, I do own 1 non-Canon lens ... excellent build quality and optics on the Tokina 12-24mm f/4.
And to keep things on-topic:
Regarding teleconverters - you cannot add a $200 2x teleconverter to a $1000 300mm lens and expect to get the quality of a $7000 600mm lens! Think about it.