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If I have the Sigma 16mm f1.4 but find that sometimes it's not wide enough for the wide angle landscapes I want to capture, should I add an ultra-wide like the Rokinon 12mm f2 or 7Artisans 10mm f2.8 fisheye to my lineup?
I want to be able to capture photos like pic related, taken at 16mm full frame.
I'm thinking the functional 18mm focal length of the Rokinon might not be enough, and may be too close in look to the Sigma. The 7A lens could be very interesting. I think playing around with a fisheye could be fun, but that's secondary to being able to take photos like pic related. What are my best options here?