Summary: This is great for a replacement for an expensive zoom if you are ware that it does not connect to the elctronics in your camera and everything will be done in manual mode. Live view won't even work. Chances are it will be very dark.
Summary: I'm not a professional photographer, but wanted a 500mm lens. For use on a tripod and taking shots of the Moon and other distant objects it works well. Hard to focus on close objects, but not impossible. I was very pleased with the results I've gotten for the price.
Summary: So, for me, the allure of a 500mm lens with a doubler was too much for me to pass up. And for this price!? I couldn't let it go... I wasn't expecting incredibly sharp, perfect pictures... but I also wasn't expecting what I got!! I took a picture at 1000mm.
Summary: Ok first of this isnt going to give you world class results but for the price its very good. Focus is manual so if you are taking photos of animals in the "wild" you will need to know where they are going to be and have the lens focused and aimed so all you need to do is some fine focusing.
Summary: All mirror lenses have well known limitations; hence they are not widely made. I use the Rokinon on a Canon 5D MKIII which readily auto exposes correctly and sharpness is acceptable as well as color transmission. The main reason to own a mirror lens is the bokeh which is unique and attractive.
Summary: I did a lot of research before purchasing this lens. The reviews are either glowing or horrible. I had one purpose in mind for this lens, photographs of the moon. My hobby is astrophotography and I wanted a light travel setup to photograph the moon high in the sky or near the horizon so I wouldn't...
Summary: This lens has a problem with sun spots when used in bright sunlight. I also experienced focus problems with Canon 5D using the Ee-D Grid Focusing screen. I need to work with it to get the shots which ususally means I lose the shot. It might be cheap but it's not worth the money.
Summary: Not the 'National Geographic' quality, but it is still a good lens for the price. It does take a lot of practice to get used to it. I could only take picture using tripod and remote shutter control.