It is an inexpensive lens. I do not have one, but have seen pictures from them, and was unfortunate to buy a similar one about 18 years ago. I had a Promaster 500 f/8.0 that I bought when I went to college. After about the first couple rolls of film through the camera I realized the limit to the lens. The new lenses do have some coatings now but are still inexpensivly made. The Rokinon and others (several are same lens with different brandings) 500 f/6.3 being 2/3 of a stop faster helps with focusing. The doghnuts for the backgrounds is not so pronounced unless you have reflective items in the background. But the lens will be soft, contrast will be low, and since newer cameras no longer have split focusing screens, pinpoint focus is hard to achieve. A tripod is a must as camera shake is a factor with a focal length this big.
At best the lens could be used for snap shots. But do not plan on making any kind of enlargements from the pics. They look decent on a monitor as small pics. But once you start going with larger pics, or printing them, the faults start to come out. Kinda like looking at your LCD on the camera and thinking a shot is good, only to find out on the computer once you get it to half or full size, you actually missed and it has several issues.
For a toy to play with, it's probably not such a bad lens. But for serious pictures, save the money for a better long range lens like a 50-50 Sigma (has a 4/3's version). They are a $1,000 but if your willing to drop $180-200 on a mirror lens. Why not toss some money into the piggy bank and wait a little. You will be much happier with the end results! Fight the I wanna have it now, and get something better down the road.
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