My take on the RF 800mm f/11 DO IS STM for birds

Started 3 months ago | Discussions thread
(unknown member) Regular Member • Posts: 217
Re: Clarification.
4

Marximus wrote:

When I add the 1.4x, that gives me 560mm at f/8. When I go into crop mode on the R5, it gives me 896mm at f/8.

Crop mode, cropping, and a TC all reduce the effective aperture.  There is no way to crop or use crop mode on an F8 image and still end up at F8.

When you crop, use a TC, or use crop mode, you are throwing away light.  A TC throws away light and spreads the remaining light across the full sensor.   Crop modes and cropping, crops away light and uses a smaller portion of the sensor.

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