$160 Smart Focal Reducer (Viltrox) In: Cameras Posted March 25, 2017 On 3/20/2017 at 5:33 AM, Deadcode said: I 'm using this Viltrox speedbooster with A6300 and with Canon 24-105 F4 IS USM, 50 1.4, 70-200 F4, 17-40 F4 The good: Image stabilisation works perfectly, aperture change from the body works perfectly, FOV is almost fullframe, i have infinity focus even with the 50 1.4. Fairly usable AF with 24-105, 70-200 and 17-40 in photo mode. The bad: dark extreme corners in photo mode (in video mode it's cropped out due to 16:9 sensor crop). AF cant lock with 50 1.4. Very rarely the adapter cant recognise the lens (on/off solves it). In video mode none of the lenses above can lock focus, just hunting. For the price the adapter is awesome, works really well with canon lenses (if you used to film in manual) and working IS! If you want to take pictures you can use AF with some of the lenses with a little corner shading. In conclusion i recommend this adapter, and i really like it. How much does it degrade the video quality if at all? are highlights blown? Shadows worse? Sharpness degraded?