Manual variable aperture zoom on a digital Pentax

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alex_virt Senior Member • Posts: 2,400
Manual variable aperture zoom on a digital Pentax

Can anybody explain to me how a manual A-series zoom with variable max aperture behaves on a digital Pentax camera?

For example, I have an F3.5-4.5 zoom.

Do I understand correctly that the camera doesn't know the actual aperture and treats the lens as a constant F3.5 zoom and underexposes at the long end?

If I set the aperture in camera to F4.5, will it remain F4.5 through the zoom range and become wide open at the long end? Or will it remain stopped down to the actual aperture of F5-something at the long end?

If set to a small aperture, e.g. F8, will the actual aperture remain F8 through the zoom range?

I'm confused...

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