Samyang 300mm f/6.3 Reflex UMC CS
The Samyang 300mm f/6.3 is a 300mm f/6.3 lens designed for Sony E, Canon EF-M, Fujifilm X, Micro Four Thirds, Samsung NX mount cameras. Check GearFocus for current availability, with buyer protection on every purchase.
Samyang 300mm f/6.3 Reflex UMC CS
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Lens Overview — Samyang 300mm f/6.3
Key Features — Samyang 300mm f/6.3
300mm Reflex Optical Design: Catadioptric mirror-based construction achieves 300mm telephoto reach in a dramatically smaller and lighter physical package than conventional telephoto lenses.
315g Compact Build: Weighs just 315g, making it one of the lightest 300mm prime options available for mirrorless systems.
APS-C Format Coverage: Designed for APS-C sensors, delivering an effective focal length of approximately 450-480mm depending on the camera system used.
Multi-Mount Availability: Available in Sony E, Canon EF-M, Fujifilm X, Micro Four Thirds, and Samsung NX mounts to suit a wide range of mirrorless systems.
Manual Focus Only: No autofocus motor is included, so this lens suits shooters comfortable with manual focus techniques for subjects like wildlife, astrophotography, or distant scenes.
f/6.3 Maximum Aperture: Fixed f/6.3 aperture is typical for reflex designs and means adequate light in good conditions, though low-light performance will be limited.
Lens Specifications — Samyang 300mm f/6.3
| Spec | Detail |
|---|---|
| Use Cases | Wildlife, Astrophotography, Sports |
| Lens Type | Telephoto |
| Format | APS-C |
| Zoom/Prime | Prime |
| Focal Length | 300mm |
| Maximum Aperture | f/6.3 |
| Camera System | Mirrorless |
| Lens Mount | Sony E, Canon EF-M, Fujifilm X, Micro Four Thirds, Samsung NX |
| Autofocus | No |
| Focus Type | Manual |
| Image Stabilization | None |
| Filter Thread | 58mm |
Description — Samyang 300mm f/6.3
The Samyang 300mm f/6.3 Reflex UMC CS is a prime telephoto lens designed for mirrorless camera systems, covering APS-C format sensors. It offers a fixed 300mm focal length and a maximum aperture of f/6.3, packaged in a reflex (catadioptric) optical construction that keeps the overall size and weight remarkably manageable. At just 315g, this lens is easy to pack and carry for extended shooting sessions.
Focus is manual only, with no autofocus capability, making it well suited to deliberate, controlled shooting scenarios. Image stabilization is not included, so stable shooting technique or a support system is recommended at this focal length. The lens features a 58mm filter thread for straightforward filter attachment. It is available across five mirrorless mount options: Sony E, Canon EF-M, Fujifilm X, Micro Four Thirds, and Samsung NX, giving it broad compatibility across the mirrorless ecosystem.
Pros — Samyang 300mm f/6.3
- ✓Ultralight 315g body makes it one of the most portable 300mm prime options for mirrorless shooters
- ✓Wide mount compatibility covers Sony E, Canon EF-M, Fujifilm X, Micro Four Thirds, and Samsung NX systems
- ✓300mm prime focal length delivers significant telephoto reach on APS-C sensors
Cons — Samyang 300mm f/6.3
- ✗Manual focus only — no autofocus support, which limits usability for fast-moving subjects
- ✗No image stabilization, making handheld shooting at 300mm more challenging
- ✗Fixed maximum aperture of f/6.3 is relatively narrow, limiting performance in lower light conditions
Videos — Samyang 300mm f/6.3
'Lost' lens review: Samyang 300mm f/6.3 mirror lens with samples — Christopher Frost