Activity Feed › Forums › Introduce Yourself › Canon RF 100-500mm F4.5-7.1 L is USM & RF 100-400mm f/5.6-8 is USM › Reply To: Canon RF 100-500mm F4.5-7.1 L is USM & RF 100-400mm f/5.6-8 is USM
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DoF and F stop is not the only difference. The quality of the glass definitely matters and hence the cost difference.
Yes, third party lens like Tamron or Sigma does make RF mount lens which you can directly mount on the camera. Do not get attracted by the price, always check for quality of glass elements used and the final picture quality.