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Currently using a Sigma 15mm, but want something a lot wider for some of the shots I'm looking to do.2 fisheyes here, but no Canon ones (Tokina and Sigma). Not that I could spare one anyway, so I'm not much help!
Is that Sigma an AF or manual? I've a feeling it's for crop sensors as well..?My Sigma is 8mm prime, Tokina is nicer (less lens flares although slightly more CA), but that's only a 10-17.
Got myself a second hand one on one of the UK Buy/Sell Facebook groups. Mental how wide it goes - it doesn't even fill the sensor when it's at 8mm. Just what I'm after...It's AF in theory, but in practice it is set manual and taped at 1.5 metres and everything beyond that is in focus anyway (f8). I use on a cropped sensor, but it will work on full frame, fairly sure you get a full circle image on there (obviously with black border outside that).
With such short focal lengths AF largely becomes irrelevant.