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F11 lens with 2x TC = F22?

Started Aug 5, 2020 | Questions thread
BlueRay2 Forum Pro • Posts: 14,816
Re: F11 lens with 2x TC = F22?

zonoskar wrote:

I know that the 2x TC you lose half the light: your equivalent lens aperture becomes 2x higher, so in case of the new RF tele lenses, you get F22 light gathering. But does that still hold for images quality due to diffraction? The physical aperture is still the same size.

wow, here i am sitting and being concerned using TC 2.0x III with my canon 600mm f4.0 III

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