>>4131058I use the Urth ethereal 1/4 because it was the cheapest I saw and there were no reviews on it.
It really fucks with autofocus on the t2i but i have since updated with the a6400 and focus is much better even with a lens adapter.
Im sure there are much better options - there is a lot of ghosting (which i actually like - especially when hue shifting the green flares to a blueblack colour).