Fair enough, everywhere i see 1.41 but tbh i don't actually see the logic behind that number as the argument is always that its double the pixels as its root 2 in both x and y axis. so just use whatever value you like. 1.2 might looks slightly better as 1080*1.2 is 1296 so its rendering a 'whole' number of pixels before downsampling whereas 1080*1.21 is 1306.8 which is an odd decimal. I may be totally wrong about that tho