Originally posted by Pewter Pardon me but M28 is short for?
Pentax 'M' series lens. Pentax has 'K' (which is not really K but just SMC), then M,A, F, FA, & DA. Plus a few others. So if someone says an M50 f/2 it means a 50mm f/2 lens from the Pentax 'M' series.
Originally posted by Pewter Pardon me but K24, K30 is short for?
'K' is shorthand for the original Pentax K-mount lenses. They were not called that by Pentax and will show "SMC Pentax" on the lens. However they are commonly referred to as 'K' series to distinguish them from the later lens series's. So K24/2.8 is a 24mm f/2.8 lens from the original k-mount series.
Oops, need to remember to refresh the screen before posting