Excerpt: The construction is entirely plastic, including the mount, and it isn't fiber-reinforced polymer as used in higher-grade lenses. Even so, the lens feels reasonably solid, not like the Canon EF 50mm f/1.8 which has a distinctly hollow feel.
Pros: Inexpensive. Very good overall performance.
Cons: Inconsistent AF accuracy on older bodies. No Quick-Shift Focus System.
My Pentax camera is finally working like a professional camera with this lens
16 March 2015
Summary: My Pentax camera is finally working like a professional camera with this lens. I put up with the original lens that came with the purchase of the camera for two years. This lens makes all my shots look like commercial photography. I can even see my pores on my nose (not a fan seeing the pores though).
Summary: This was a fantastic buy at $200, at the current price of $120 it's a steal. I'm a hobbyist photographer. There's something about the images I get with this lens compared to my other lenses that I really like. Not sure if it's the bokeh or some other hard-to-describe quality, but I like it. Maybe it's just that my other lenses are zooms and what I'm experiencing is the quality difference of a prime (all are Pentax DA lenses).
Summary: A co-worker suggested getting a prime lense after getting back in to the hobby recently. Being a total noob, I was like "a lense without zoom, why would that be useful?". This thing however captures low light scenes like nothing else I have used previously. I can only imagine what the 500 dollar one looks like. Seeing as I don't live off my photography that will have to remain a dream.
Summary: I have the Pentax K5IIs camera. I also own prime Pentax lenses; the 35mm f2.4, the 40mm f2.8 and the DA 50mm f1.8. Of the 3, my least favorite is the 35mm. The pictures taken by the 35mm lens are sharp, but its colors are nothing special. I generally use my 40mm lens when taking group photos. The more costly 40mm lens produces sharp pictures with stunning colors. The 50mm lens is a wonderful portrait lens.
Summary: Great price for such a versatile prime lens... My new Entry/Mid level DSLR kit now has great low-light and portrait capabilities. If you're used to the wider FOV of "stock" or kit lenses -a prime lens may take a bit of getting used to. I'm using this lens with a Pentax K-50 camera. I have an 18-55mm kit lens and a 50-200mm telephoto lens. This 50mm lens compliments the other two very nicely.
Summary: I bought the lens for a new Pentax K-50 DSLR body. The lens met my expectations for a very reasonable cost. I purchased it mainly to manage bokeh under low light conditions. It does it very well. The lens is very light weight, which I like. There is a slight magnification on the digital cameras, if that is important. The auto focus seems a bit slow, but it has not hampered anything I have tried so far.
Summary: I can shoot inside the house now!! I love it. The price is great at under $130. I didn't have $400+ to spend on a 50mm 1.4 auto, so I got this. Couldn't be happier with it. Yes, it has some problems hunting dark objects in low life, but that's when you switch to manual mode and estimate. I don't think you can wrong with it.