Rokinon Reflex 300mm f/6.3 ED UMC Telephoto Lens for Micro Four Thirds
The Rokinon 300mm f/6.3 ED UMC is a 300mm f/6.3 lens designed for Micro Four Thirds mount cameras. Check GearFocus for current availability, with buyer protection on every purchase.
Rokinon Reflex 300mm f/6.3 ED UMC Telephoto Lens for Micro Four Thirds
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Lens Overview — Rokinon 300mm f/6.3 ED UMC
Key Features — Rokinon 300mm f/6.3 ED UMC
300mm Catadioptric Design: Mirror reflex optical construction delivers 300mm telephoto reach in a significantly more compact physical package than a conventional telephoto lens of the same focal length.
600mm Effective Focal Length: On Micro Four Thirds bodies, the 2x crop factor gives an effective 600mm field of view, useful for wildlife, sports, and distant subjects.
Ultralight 260g Build: At just 260g, this is one of the lightest 300mm telephoto options available, making it well suited for travel, hiking, and handheld shooting.
Native MFT Mount: Dedicated Micro Four Thirds mount provides direct mechanical compatibility with MFT mirrorless bodies from Olympus and Panasonic.
ED Glass Element: Extra-low dispersion glass helps reduce chromatic aberration, improving edge sharpness and color accuracy across the frame.
UMC Lens Coatings: Ultra Multi-Coating minimizes flare and ghosting, supporting better contrast and color fidelity when shooting toward bright light sources.
Lens Specifications — Rokinon 300mm f/6.3 ED UMC
| Spec | Detail |
|---|---|
| Use Cases | Wildlife, Birding, Travel |
| Lens Type | Telephoto |
| Format | Micro Four Thirds (MFT) |
| Zoom/Prime | Prime |
| Focal Length | 300mm |
| Maximum Aperture | f/6.3 |
| Camera System | Mirrorless |
| Lens Mount | Micro Four Thirds |
| Autofocus | No |
| Focus Type | Manual |
| Image Stabilization | None |
| Filter Thread | 58mm |
Description — Rokinon 300mm f/6.3 ED UMC
The Rokinon Reflex 300mm f/6.3 is a prime telephoto lens designed specifically for the Micro Four Thirds mirrorless camera system. Built around a reflex (catadioptric) optical design, it achieves a 300mm focal length while keeping the overall weight to just 260g — impressively light for a telephoto of this reach. The lens mounts directly to MFT cameras via a native Micro Four Thirds mount and accepts 58mm screw-in filters.
With a maximum aperture of f/6.3, it is suited to bright outdoor conditions where light is plentiful. Focusing is entirely manual — there is no autofocus system — which places this lens firmly in the hands of photographers who prefer deliberate, hands-on control. Image stabilization is not included, so a steady hand or stable support is recommended at this focal length. For Micro Four Thirds shooters seeking a compact and lightweight 300mm prime for travel, landscape, or general telephoto work, this lens presents a physically manageable option within the MFT ecosystem.
Pros — Rokinon 300mm f/6.3 ED UMC
- ✓Extremely lightweight at just 260g for a 300mm telephoto lens
- ✓Native Micro Four Thirds mount ensures direct compatibility with MFT mirrorless cameras
- ✓Prime 300mm focal length provides a dedicated telephoto reach without zoom complexity
Cons — Rokinon 300mm f/6.3 ED UMC
- ✗Manual focus only — no autofocus capability, which limits fast-action shooting scenarios
- ✗Maximum aperture of f/6.3 is relatively modest, reducing performance in lower light conditions
- ✗No image stabilization on the lens, requiring reliance on in-body stabilization or careful technique
Videos — Rokinon 300mm f/6.3 ED UMC
'Lost' lens review: Samyang 300mm f/6.3 mirror lens with samples — Christopher Frost