Patrick M P Donnelly

Kowa make machine vision lenses, no, don't laugh yet, designated for 1 inch digital sensors. 4.7mm and 6mm. The latter covers Panasonic GH4 in video 16:9 mode completely, a crop factor of c. 2.3~2.4 to 135 format. S16 is c.2.7 crop. So should cover S16 as well. Not too expensive, in used condition. $400 or so. https://www.youtube.com/watch?v=ZNZsPUBJABA https://www.youtube.com/watch?v=LkM5Sjj2dzI&t=152s https://www.youtube.com/watch?v=gki1pdaihZY https://www.youtube.com/watch?v=M0mka9uumkk https://vimeo.com/103893379 https://www.youtube.com/watch?v=eEh42ahsEWM https://www.youtube.com/watch?v=xlxwwH8IPrM&t=81s https://www.youtube.com/watch?v=BySiqe9nAeI The 4.7mm is unknown as to cover but should do nearly as well. Pricey.... 1,300+ new. Ergonomics are awful, and contrast is modern. 100 lpmm and very low distortion.

There are 4.8, 5.5, 6 and 6.5mm c mount lenses available on fleabay. All but the 4.8mm are for 1 inch sensors, close to S16mm. The 4.8mm is on its way to me and may be for 1 inch. The distortions are impressive, but the 6.5mm is almost tolerable. The best rectilinear, moderately affordable, extreme, wide angle lens in C mount, is the Kowa or Navitar 6mm HC series. Some second hand ones have wandered onto our fave electronic flea market. There appear unused. Some seller has compiled all the available video demonstrations of this lens, in the advert. Modesty forbids... Brand new, the Kowa actually have a wider lens: 4.7mm F/2.4 for a mere $1,079 AUD. Unknown how it draws.

Just bought a 17 to 130mm Monital Sopelem zoom for 50 Euro, incl postage to Australia. From $895.... not a great hedge against inflation! Seller did not mention any of the magic words.... only bidder.