This is a great prime lens. Pentax Limited lenses are all awesome, sharp and durable with aluminum body and this one is no exception. This 15mm is perfect for shooting landscapes and for travel as a walkabout lens, because it is so light and unobtrusive. It is reasonably sharp in the corners when wide open and perectly sharp in the corners above f5.6. Center is tack sharp throughout the f range. The tulip style hood is built into the lens and slides in and out, with its inner wall lined with black velvet lining. The cap is metal and screws on with 6 half-turns, also lined on teh inside with black velvet fabric. This lens is not weather sealed. I would recommend it to anyone who wants a wide angle lens and doesn't want to lug around 2 punds worth of glass.
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