Canon EF 400mm f/4 DO IS ii USM lens review with samples (Full-frame & APS-C)

I've been wanting to test this lens ever since I first met it at Photokina in 2014. That was a little while ago now, though - let's see if it's all it's cut out to be on modern, high resolution cameras.

Find it here (Amazon affiliate link):
https://geni.us/canonef400f4doii

All pictures shot by me on Canon 6D, Sony a7R II, and Canon EOS M6 Mark ii cameras.

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Equipment I use to make my videos (Amazon affiliate links):
Canon EOS R5: https://geni.us/CanonEOSR5Body
Canon EF-RF Adaptor: https://geni.us/CanonEFtoRF
Sigma 50mm f/1.4 'Art': https://geni.us/Sigma50mm14Art
Canon RF 35mm f/1.8 IS STM: https://geni.us/CanonRF35mm18Macro
Marumi Fit and Slim CPL Filter: https://geni.us/MarumiFitSlim77
AudioTechnica AT2020USB+ Microphone: https://geni.us/AT2020USBPlusMic
Rode Smartlav+ Microphone: https://geni.us/RodeSmartLavalierPlus
Rode SC3 adapter: https://geni.us/RodeSC3MicAdaptor
Zoom H1n Recorder: https://geni.us/ZoomH1nMiniRecorder
DJI Mini 2 Drone: https://geni.us/DJIMini2FlyMore

Music:
'Opportunity Walks', Kevin MacLeod (www.incompetech.com)
Licensed under Creative Commons: By Attribution 3.0
http://creativecommons.org/licenses/b...