Samyang's budget telephoto mirror alternative — the 300mm f/6.3 ED for APS-C.
The Samyang 300mm f/6.3 ED UMC CS is a compact telephoto prime for APS-C — a refractive (not mirror) design providing 450mm equivalent at budget pricing. The ED element controls chromatic aberration. UMC coatings. The CS designation confirms APS-C coverage. At f/6.3, it is slow but the refractive design provides conventional bokeh unlike mirror alternatives.
The refractive design is the advantage over mirror lens alternatives — conventional bokeh without doughnut characteristics and better contrast. Sharpness acceptable. ED element controls CA. The f/6.3 is slow — requiring good light. The 450mm equivalent on APS-C provides genuine telephoto reach. UMC coatings reduce flare. Manual focus.
Mount not specified — verify. Available in multiple mounts. Manual focus only — no electronics. Filter thread varies. Weight approximately 320 grams — compact for 300mm refractive. Build quality solid metal. The refractive design keeps weight and size down while providing conventional optical characteristics unavailable from mirror alternatives.
Very cheap. Verify mount. Refractive — conventional bokeh advantage over mirrors. The f/6.3 demands good light. ED element adds genuine value. 450mm equivalent on APS-C. For budget super-telephoto in good light. Manual focus. Better than mirror lens alternatives optically.