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Pentax 50mm F/1.4 SMC FA K Mount Autofocus Lens {49}
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$106.00
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Pentax's full-frame 50mm f/1.4 normal prime, refined with HD coating.
The HD PENTAX-FA 50mm f/1.4 is the kind of lens that earns permanent residence on a camera body. At f/1.4, it pulls in enough light for available-light work that would stop slower glass cold, and the HD multilayer coating keeps contrast tight across the full frame from corner to corner. The 50mm focal length on a full-frame K-mount body sits close enough to the human field of view that framing becomes instinctive, you stop thinking about the lens and start thinking about the picture.
With a minimum focus distance of 1.5 ft and a 49mm filter thread, this is a genuinely compact prime. The optical design covers the full-frame image circle, so K-mount shooters on the Pentax K-1 or K-1 Mark II get every bit of what the sensor can resolve. Autofocus is on board, keeping it practical for candid and moving-subject work. At f/1.4, background separation is real and immediate, no hunting for it.
Who It's For
Street photographers working in low light will appreciate the f/1.4 aperture and compact footprint that keeps the kit unobtrusive. Portrait shooters on full-frame K-mount bodies get a focal length that flatters subjects without distortion and enough aperture to separate a face from its background at close range. Documentary and travel photographers who want one lens that handles dim interiors and bright exteriors without a bag full of glass will find the 50mm focal length and HD coating a practical combination. Film-to-digital K-mount converts who already own FA-series glass will recognize the lineage immediately.
Key Features
- f/1.4 maximum aperture for available-light work
- 50mm focal length matches human field of view
- Full-frame K-mount optical coverage
- HD multilayer coating for edge-to-edge contrast
- 1.5 ft minimum focus distance
- 49mm filter thread
- Autofocus-equipped normal prime
FAQ
- What's the autofocus speed like on this 50mm?
- The lens has autofocus built in, making it practical for candid and moving-subject work, though Pentax doesn't publish specific AF speed metrics for this model.
- Can I use this on crop-sensor K-mount bodies?
- Yes. The optical design covers the full-frame image circle, so it works on any K-mount body - you just get the effective focal length multiplied by the crop factor.
- How close can I focus with this lens?
- Minimum focus distance is 1.5 feet, which is close enough for environmental portraits and detail work without needing extension tubes.
- What does the HD coating actually do?
- Pentax's HD multilayer coating reduces internal reflections and flare across the visible spectrum, keeping contrast tight and maintaining color fidelity edge to edge.
- Is this lens compact enough for travel?
- At f/1.4 in a 50mm focal length with a 49mm filter thread, it's genuinely portable - the kind of prime you'll actually carry every day.
- How much background blur does f/1.4 give you?
- At f/1.4, background separation is real and immediate on full-frame - no hunting for bokeh. The effect is most pronounced at closer focus distances.
| Specification | Value |
|---|---|
| Focal Length | 50mm |
| Max Aperture | f/1.4 |
| Mount | Pentax K |
| Min Focus Distance | 1.5 ft |
| Filter Thread | 49mm |
| Coating | HD Multilayer Coating |
This description was generated using AI based on KEH's internal product standards, product expertise, and knowing what customers care about most. While we strive for accuracy, details may vary by individual item.
| Brand Name | Pentax |
|---|---|
| Filter Size | 49mm |
| Focus Type | Autofocus (camera motor) |
| Lens Mount | Pentax KAF2 (SMC-FA) |
| Lens Type | Standard / Normal |
| Max Focal Length | 50mm |
| Min Focal Length | 50mm |
