Excellent lens. Look for least expensive branding.
Thomas Almy, Amazon
2 May 2015
Summary: I bought this Samyang lens for Nikon under the Vivitar brand. Also available as Rokinon, Bower, and others -- buy the one going for the lowest price. At F1.4 the lens is sharp in the center, but soft at the corners and edges. Noticeable vignetting that is correctable in post processing.
Summary: Thought that this lens would provide that extra measure of tack sharpness expected from a prime lens over a zoom. Some of the reviews rave about the sharpness and thought I was making a good choice.
Excerpt: This is a great lens. I find that I love using it because of its 1.4 maximum aperture that allows me to use it for low-light situations. However, at 1.4, you have to be very calculating about the area you want in focus, because that depth of field is indeed shallow.
Excerpt: I use this on a crop sensor Canon 50D as it gives me a 56mm equivalent on a film or full sensor camera. I have an 18-200 lens but it only goes down to f/3.5 of 4 at 50mm so I need this for the depth of field it can give with the f/1.4 aperture.
Pros: Durable, Nice Bokeh, Rugged, Strong Construction