Combined with my [full frame] A7S as an affordable astrophotography option. This little guy allows me to get a full 30" exposure from the sensor without having to resort to bulb mode, resulting in a ton of light/stars with no blowout! Between that and a field of view of around 110* at full frame, this is a great landscape lens for photography on the go or for gigs in small clubs. The focus ring complicates the manual aspect a bit. It rotates over 180* which can barrel and wide angle in general it can be very difficult to tell exactly where your focus point is, even when focus is on. It is best to use the zoom. [No magnifying glass] I had some trouble focusing the whole scene because I didn't know exactly where my sharpest spot was - even using F11 to get the sun spots, a tree about 6ft away was blurry. Although this tree wasn't on the other side of the frame either, it still had quite a bit of distortion. Here's another weak point of this lens - angular distortion and lack of detail. It's definitely better with the right lens correction, but it still makes it difficult to use the entire frame in most applications. Adobe Bridge features Rokinon lens profiles, some of which help eliminate the soft fisheye effect in the center of the frame, and others smooth out the corners, restoring them to working condition. I have yet to find the magical cure for both of them. I think the Rokinon 12mm/16mm and several Canon profiles with longer lenses had the best average of the two. Don't get me wrong, as much as I paint a negative tone on this wide angle lens, it still manages to capture some really cool shots! One of my first real compositions [rather than just shooting for the new wide angle] with this lens came out fantastic and gave the scene a lot of cloud movement. I'll try to find a picture and post it as an example. But with the right angle and scene, it's still a very handy lens that can produce fantastic images! If you're looking for a natural scene that needs to cover a large area, shooting at or slightly above eye level is your best bet for the least amount of distortion. Also, a good rule of thumb is to have your foreground subject at least 6 feet [if not 8 feet] away to avoid too much distortion, which you may or may not correct. Ultimately, despite all my downsides listed above, this is still a really good lens to capture great self-control with - it all depends on how you use it! :)
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