I think this is one thing the Nikon system works better. When the lens was zoomed, or macro lens focuses to very close distance, the aperture readout would be compensated automatically. Pentax AF system doesn't do that.Variable-aperture zooms have fixed contact patterns, and can therefore only indicate a fixed aperture range. In this case, the incorrect f-stop may be displayed in the viewfinder, and I guess that because of this, Pentax left the feature completely out. Note that due to the TTL exposure metering, the film will be exposed properly regardless of the fact that the f-stop's numerical value may be calculated incorrectly."
regards,
Alan Chan
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