Pentax's budget APS-C telephoto — same specification as similar DA 50-200mm variants.
The Pentax 50-200mm f/4-5.6 ED is a budget telephoto zoom for Pentax APS-C DSLRs, covering 75-300mm equivalent. With ED glass for chromatic aberration control, it provides basic telephoto reach. Similar or identical to other DA 50-200mm listings.
Optically basic — acceptable centre sharpness with ED glass helping with CA. Body-driven screw AF. No weather sealing on this version. In-body SR compensates for lack of lens stabilisation. Adequate for casual telephoto use.
Pentax K mount. ED glass elements. Lightweight and compact. APS-C coverage. Body-driven AF. No weather sealing on base version. Similar to IDs 1125 and 1320 depending on exact variant.
Available used very cheaply. Check if this is a duplicate of IDs 1125 or 1320 — similar DA 50-200mm variants exist. The HD 55-300mm PLM WR is much better. For budget Pentax APS-C telephoto needs.