Pentax 50mm f/1.8 Lens
The Pentax 50mm f/1.8 is a 50mm f/1.8 lens designed for Pentax K mount cameras. Used copies start from $85.34 on GearFocus, with buyer protection on every purchase.
Pentax 50mm f/1.8 Lens
Used Pentax 50mm f/1.8 Listings on GearFocus
Lens Overview — Pentax 50mm f/1.8
Key Features — Pentax 50mm f/1.8
50mm f/1.8 Prime: A fixed standard focal length with a wide maximum aperture, well-suited for everyday photography, portraits, and low-light shooting.
Pentax K Mount: Natively compatible with Pentax K-mount DSLRs, integrating cleanly with the full Pentax K-mount ecosystem including APS-C and full-frame bodies.
Auto & Manual Focus: Supports both autofocus and manual focus operation, giving shooters flexibility across different shooting situations.
122g Lightweight Build: One of the lightest lenses in the Pentax lineup, making it easy to carry for extended sessions or travel photography.
75mm Effective Focal Length: On an APS-C sensor, the 50mm focal length translates to a 75mm equivalent, a flattering range for portraiture.
49mm Filter Thread: A common filter size that makes it straightforward to source and share filters with other lenses in your kit.
Lens Specifications — Pentax 50mm f/1.8
| Spec | Detail |
|---|---|
| Use Cases | Portrait, Street, Travel, Beginner-Friendly |
| Lens Type | Prime |
| Format | Full Frame |
| Zoom/Prime | Prime |
| Focal Length | 50mm |
| Maximum Aperture | f/1.8 |
| Camera System | DSLR |
| Lens Mount | Pentax K |
| Autofocus | Yes |
| Focus Type | Auto, Manual |
| Image Stabilization | None |
| Filter Thread | 49mm |
Description — Pentax 50mm f/1.8
The Pentax 50mm f/1.8 is a prime lens designed for Pentax K-mount DSLR cameras with APS-C sensors. Its f/1.8 maximum aperture provides meaningful light-gathering capability, helping in challenging lighting and enabling a shallower depth of field when desired. Sitting in the standard focal length range at a fixed 50mm, it encourages deliberate framing and is versatile across many photographic genres.
The lens supports autofocus and manual focus, giving the shooter control over how they engage with the focusing system. Weighing only 122g, it adds minimal bulk to any kit. The 49mm filter thread accepts commonly available filter accessories.
As a dedicated APS-C format prime on the Pentax K mount, it is purpose-built for Pentax crop-sensor DSLR shooters seeking a fast, compact, and straightforward prime option.
Pros — Pentax 50mm f/1.8
- ✓Wide maximum aperture of f/1.8 supports shooting in lower light conditions
- ✓Extremely lightweight at just 122g, making it ideal for travel and everyday carry
- ✓Supports both autofocus and manual focus operation for flexible shooting
Cons — Pentax 50mm f/1.8
- ✗No image stabilization, which may be a limitation in low-light or slower shutter speed situations
- ✗APS-C-only format limits compatibility to crop-sensor Pentax K-mount bodies
- ✗Pentax K mount restricts use to the Pentax DSLR ecosystem with no cross-system flexibility