Teleconverter Field of View
Compute effective focal length and aperture when adding a 1.4× / 1.7× / 2× / 3× TC.
Effective focal length
280 mm
Effective max aperture
f/3.3
Stops of light lost
1.0
Note
Most AF systems only work down to f/5.6 — confirm with body manual.
About this tool
Apply magnification to your lens and compute the new max aperture after the stop loss. Targets r/photography 'what TC to buy' threads.
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