The former will have FoV comparable to 90mm lens placed on a 35mm camera and the latter, 120mm lens on a 35mm camera. Sigma hasn’t disclosed the optical formula of the lens, but it appears to have telecentric design.
It also has a linear autofocus motor and inner focusing design that can improve accuracy and reduce drive noise, due to the absence of gearing. The quieter operations should allow better video capture capability.
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