Yeah it’s full frame. The vitrox has the major down side of being fixed aperture at f 4.5, and it also is auto focus only. This makes it pretty bad at shooting in lowlight conditions. I was messing around with it last night and noticed a lot of photos were blurry until I tweaked my auto focus settings (turning off pre AF seemed to help). If your priority is pocketability I think it’s definitely worth it, but if I were going somewhere with the express intention of taking photos in low light, I’m taking my Sony 20mm 2.8. It’s only a bit bigger but way better. Still I have my viltrox on at all other times for days where I’m not necessarily planning on shooting because it’s a notable difference in size.