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Forum: Pentax SLR Lens Discussion
07-02-2015, 08:26 PM
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To reiterate what others have said, it wasn't a stupid question. We call these constant-aperture zooms because the maximum aperture remains the same throughout the zoom range. It's a feature often expected of professional zoom lenses because it often, but does not always, mean consistent optical performance across the zoom range, compared to cheaper consumer-grade zooms which are often f/3.5 or f/4 at the short end but only f/5.6 (or even f/6.3) at the long end. I have the DA* 60-250/4, and it's f/4 maximum throughout the zoom range, but it allows me to stop down to any aperture below that, to a minimum of f/32.
The terminology is a bit confusing here, and I don't blame you for that. Once again, this wasn't a stupid question at all. We take great pride in making this a welcoming and friendly place to talk about photography and Pentax equipment. Welcome to the forums. :)
—DragonLord
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