You can save $200 off of the well-regarded Sigma 150-600mm f/5-6.3 Contemporary DG OS HSM lens for the EF mount. This lens will work as it should on RF mount cameras using the EF adapter. Sigma 150-600mm f/5-6.3 Contemporary DG OS HSM EF-Mount Lens/Full-Frame Format Aperture Range: f/5 to f/22 One FLD Element, Three SLD
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