Gavin Greenwalt
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So you think 8mm @ 5K would cover 180 degrees?
Or do I need a Sigma 4.5 or the like?
8mm will only deliver 180* coverage on one of the two axis. If you need full 180* on both axis you need a sigma 4.5 or Sumex.
In which case I think 4k should provide full coverage too. But you'll only get less than 2k worth of usable detail.