12mm Ultra Wide.

Now here's something a bit out of the ordinary which you don't often see on ebay or the sales adds.
A 12mm uwa fisheye full frame lens in an m42 mount. Admittedly a tad pricey @ £175 but interesting never-the-less for someone who wishes to experiment or who has a purposeful need for such a quirky lens.

I'm tempted myself just out of curiosity for the unique imagery that it can render but - hey-ho!

https://www.harrisoncameras.co.uk/used/used-camera-lenses/?filter=brand:used-sig...

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C.O.L.B.A.S victim
(Compulsive Obsessive Lens Buying Addiction Syndrome)

What you need are lenses, more lenses, bigger lenses, better lenses, faster lenses, vintage lenses and when you have these, your pictures will be perfect!