Updated Sony 28-70mm lens could have a constant f/4.0 aperture.

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There is a new Sony patent disclosing a new 28-70mm f/4.0 FE lens design. It may be that a future updated 28-70mm lens will get a constant f/4.0 aperture instead of the variable f/3.5-5.6 aperture of the current lens.

Patent via Egami.

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