Great cheap lens :)
Sittatunga wrote:
Steve Balcombe wrote:
David Yule wrote:
My copy isn't great between 24mm and 26mm, the corners seem to be "stretched" in-camera for jpegs and for RAWs by Lightroom/DPP. There is a theory the image circle doesn't quite cover the sensor around at around 24mm.
Not just a theory - if you turn off Profile Corrections in Lightroom you can see the black corners:

Beyond 26mm the lens is good.
It doesn't actually need to cover the corners before distortion correction, as correcting that amount of barrel stretches them beyond the image rectangle anyway. The barrel distortion doesn't look particularly bad for that image until you realise that it's just about reversed the catenaries of the electricity cables.
Haha yes true!
In some ways, heavy barrel distortion or a stereographic projection fisheye looks better than a rectilinear projection wideangle because they preserve the relative angles of 3D objects better away from the centre. For example,

The photographer on the right and the hikers on the left would have looked very odd had I used a rectilinear lens with this horizontal field of view.
This is especially true for wide angle close ups, I've found. I like to use the fisheye zoom at 15 mm for flowers and fungi occasionally.
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