Is my math right?

Canon EF Lens to Micro Four Thirds T CINE Speed Booster ULTRA 0.71x

Tamron 18-400mm f/3.5-6.3 APS-C Lens

BMPCC4K 1.9x Crop

= 24.28-539.6mm f/2.2-4


Cheers

Yep

Cheers man

Actually the Ultra gives you a stop, not 1.33 so I think it might be f/2.5-4.5

Right Craig.


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Cheers Rick