I was out taking a few pics today with my Samyang 85 on my 5d2. Definitely not easy to get eyes in perfect focus through the view finder, and especially noticeable wider than around f4 ..
Here's an example of a shot that looked fine in the viewfinder but was a bit soft on further inspection..
|IMAGE IS A REDIRECT OR MISSING!|
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I will just have to remind myself to slow down, stop down, and take more shots. Running and gunning at 1.4 is out of the question.