The HD Pentax-DA 70mm F2.4 is a very odd lens in all sorts of ways. It looks like a retro analog lens, but it lacks an aperture ring and is very much a digital re-imagining of a ‘classic’ lens. The focal length sounds more appropriate for a full-frame camera, but in fact this is an APS-C lens. And it has the dimensions of a pancake lens, but the effective focal length (105mm) of a short telephoto.
Even the maximum aperture is odd, which at f/2.4 is neither fast nor slow. It’s impressive for a lens this small to be so fast, but at the same time, it’s far from ‘fast’ by modern standards.
