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Are Dahua vari-focal lenses constant aperture?
I don't think they're constant aperture. The review of HDW5831R-ZE estimates the aperture at telephoto at F2.0 and the datasheet for this camera lists only "F1.4" on the spec sheet. F1.4 must only apply to the wide end of the lens. I'd like to know how the aperture changes for the...