Samyang/Rokinon first impressions
I just received the Rokinon 7.5mm (250$ on Ebay.ca). After a few days of mostly outdoors shooting, I can share a few first impressions.
First, in terms of build quality. It's a tight, light and well-built little lens but the focus ring is very hard to turn, as if the lubricant had somehow frozen up - not that you need to focus much for most landscape pictures in the first place. The aperture ring is smooth and first rate.
Second, in terms of operation. As was noted earlier in this excellent review: <http://m43photo.blogspot.ca/2012/02/samyang-75mm-f35-fisheye-lens-review.html> you need to make frequent exposure adjustments when you take pictures in darker situations, up to +2 EV. This and the slow and tricky focusing (when you need a crisp foreground) makes this lens a definite "Take your time to compose" deal as opposed to a "sports event" lens, which is OK because planning a good composition with a fisheye lens takes time in order to avoid gimmicky shots.
Finally, image quality: The overall sharpness is very good, even in the corners. Shooting at F 5.6 - 8 yields consistent results. Again, you need to take your time in order to have every parameter right but you should be very happy with the results, especially at such a low price!
As mentioned, too much friction in the focus ring - perhaps just on my own copy - and need to adjust exposure more often than on a "regular" (non-manual) lens.
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