Canon EF 200-400mm f/4L IS USM Extender 1.4x
Announced May 14, 2013 •
Telephoto zoom lens | Canon EF
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Using an extender (tele converter) has the advantage that the absolute aperture (in mm, not as f/ number) remains the same with the same lens which allows a relative bright f/nubmer without T/C and yet acceptable with T/C. E.g the bright 200mm f/2.8L with T/C results in a yet acceptable 400 f/5.6. A zoom alternative (100-400 f/4.5-5.6L) results in a dim f/5 at 200mm. Why not make a 200-400 f/2.8-f/5.6 which replaces a T/C and a prime lens ? There is a 200-400 lens f/4L, but that is not a...