Kenko DGX 2x Teleplus Pro 300 with 60D

Started Jan 27, 2013 | Discussions thread
Flying Fish
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Re: Kenko DGX 2x Teleplus Pro 300 with 60D
In reply to Steve Balcombe, Jan 29, 2013

You're assuming too much understanding on my part.    My question is if Venus is so tiny, how does it make a difference if the maximum aperture is f/5.6 or f/11 for such a tiny object?  I'm having trouble visualizing the geometry your explanation implied.  And from there, if you can focus on tiny Venus, then why not on an elephant?

FF

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