RF 100-400 and teleconverter, same issue as 100-500?

Started 4 months ago | Discussions thread
John Sheehy Forum Pro • Posts: 25,311
Re: RF 100-400 and teleconverter, same issue as 100-500?
2

Wing2 wrote:

The 2x converter sounds like a better match for lens with such wide zoom range

1.4x's main useful range is 400-560, 160mm extra reach

2x's main useful range is 400-800, 400mm extra reach

Yes, 2x is darker, but not a full stop darker between 400-560mm. According to CameraLabs.com's test, this lens has a f number of 7.1 from 156-259mm and f8 from 259 to 400mm

Another way to look at those numbers is that without a TC, 400mm would have a maximum aperture of f/8; with a 1.4x 400mm would be about f/11.3 (8*1.414), and with a 2x, 400mm would be about f/14.254 (7.127*2).

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Beware of correct answers to wrong questions.
John
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