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Got the Samyang 8mm F2.8 a week back and just did a pool test. Focuses well when set to F8, focus 0.3m within the 4.33" dome for objects a metre or more away. Anything closer than 0.6m will become out of focus. Here's a pool shot. DSC02268.jpg
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I also tried the Sigma 19mm within the dome - it's very sharp for objects a metre away, and looks sharp at 0.6m too. Anything closer is out of focus.
I don't have one to compare, but my impression is that the 16mm has quite a bit of chromatic and edge distortion on the nex7.
I've been using the kit 16 mm with both the fisheye and the wideangle adapters. Yes the is a lot of chromic distortion. I can repair a lot of it with Lightroom 4. However, overall image quality is disappointing. Getting much better color, contrast and sharpness with the Sigma 19mm.
Nope, in a dome port, I just used min focus distance 0.3 and F8 in order to focus on the virtual image. F5.6 might work too, but I have just left it on F8. You can turn on focus peaking to have an idea of the focused areas.