Editorial Review:Product Description:The Pentax interchangeable lens system provides a complete line of high-quality lenses to satisfy your every creative need. Offering a wide range of focal lengths, functions and effects for different formats, Pentax lenses are designed to maximize each camera's capabilities.
Amazon.com Product Description:The Pentax SMCP-FA 50mm f1.4 lens has a fully automatic diaphragm. At 1.5 inches long and weighing just 7.8 ounces, you can take this 50mm fixed focal length lens with you everywhere. You can use this lens with all Pentax SLR cameras, but the AF system only works with Pentax AF cameras.
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Customer Reviews
Average Rating:

Rating: 
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Just get it
Got it for baby portraits with a k200d. Amazing results.
Only draw back is that it gives you such shallow depth of field at 1.4 (which is a very very good thing), you need to be really precise in focusing.
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Great Portrait Lens!
Becomes a 75mm lens when used with an APS-C sensor camera. It's not bad wide open, but use this lens stopped down to f/2 or greater for the best quality! This is the best value 50mm lens made and possibly the best 50mm currently made today.
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Great, great lens
This is such a fun lens to take pictures with. It is fast wide open. The automatic focus is really nice, but switching to manual gives you so many other creative options. Definitely worth the price.
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For the price - essential
I purchased this lens through a different retailer (B&H) for the same price as advertised here. At first, I used it because my standard lens was not capturing my flash at a distance that I needed to photograph a large item that I was selling. Instead of a more powerful flash, this seemed like a better alternative. It worked perfectly. Zoom lenses are nice, but there are too many situations, especially with a DSLR, where they just don't cut it. For medium-low light, I prefer this to flash anytime, especially for $200.00.
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Just buy it.
If you've never had a fixed lens you don't even know what you're missing. If you've never had a lens that fast you don't know what you're missing. If you've never had an original Pentax lens on your Pentax or Samsung camera, you don't know what you're missing.
Just go and buy it. What are you waiting for?