I also own a Sigma 24mm f1.4 ART lens and although the Sigma is more than twice as expensive, I don't believe it does as good a job as the Rokinon in taking pictures of the stars.

True to its claimed improvement for focus ability, this Rokinon/Samyang works with all of our Nikon cameras (D800 (FX), D3200 (DX), D300s (DX), D40X (DX)) and focus is accomplished through these cameras' range-finders

The Rokinon is dead sharp at f/2.8 on the XE-1, and its well-known mustache distortion can be corrected with Photo Ninja's distortion tools

I love rokinon's lenses.

A strong value and well made lens at the ultra-wide end, given it's manual focus as well as mild distortion constraints, one thing the Rokinon can do very well is time-lapse: capture sunsets, moonlight, starlight, clouds, and great colors along the horizon, leveraging the AE-chip that will adjust metering according to changing light conditions.

Many budget wide angle lenses will have this problem, so let’s not kill Rokinon for it