VOLUME! The time period when M lenses were sold coincides with the Pentax's K mount body sales peak: ME, ME Super, MX & K1000.
BR From: [EMAIL PROTECTED] OK, here's a question for those of you with broader experience of pentax lenses (I've used K, M, and A*)--are the "M" lenses the low-water mark of pentax optics? I would think either that or sales volume accounts for their prevalence on the used market.
