Samyang 500mm f/6.3 .... got this bad boi in the mail yesterday was pretty stoked to test it out... probably gonna get a ND filter for this guy next using a 92mm
Samyang 500mm f/6.3 Mirror Lens - White with Canon Lens Adapter
a6500 with 500mm Mirror Lens? Stabilized beast or junk? - YouTube
Samyang Mirror Lens 500 mm 1:6.3 DX. Comparison with Rubinar 500/5.6. Review of the mirror-lens lens by Rodion Eshmakov | Happy