1.4x or 2x?

Started Sep 6, 2012 | Discussions thread
Mark B. Forum Pro • Posts: 23,992
Re: 1.4x or 2x?

AC1 wrote:

Looking for max reach with my 7D, borrowing a friend's 100-400 (may buy myself one day) and thinking about getting an extender. What kind of performance should I expect from either a 1.4x or 2x in terms of IQ and ability to focus?

The idea of 2x is tempting given the effective focal length would be 2 x 400 x 1.6 = 1280mm which would be pretty handy for my long-range purposes!

You'll lose AF with either a 1.4x or 2x, and with a 2x the viewfinder will be so dim it will be difficult to even focus manually. The IQ won't be anything to write home about either. I wouldn't use any more than a 1.4x on this lens.


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