I paid $100 for an RF-mount Laowa 4mm circular fisheye. I bid on one and won.
As you know, it's got a bare metal mount. No communication between the lens and the camera at all. No AF, no IS, no EXIF, none of that. So, with that in mind, my lens works perfectly. Mounts right up. Sensor reads the image.
Mine's a fisheye lens so I don't even know how I'd evaluate the glass. The image is curved, but sharp enough. Infinity starts at about 3 feet, so manual focus is no big deal. It's an odd enough lens that I don't think you could translate its characteristics to a different lens. Sorry.
But my Laowa lens does have an oddity that might interest you. It's a 4mm lens with a 210° angle of view. I used to own a Sigma 180° circular fisheye and that was plenty wide. At 210° the Laowa can see the grip of my R10. If I happen to be using the grip to hold the camera, it can see my fingers. I built 2 LR presets to crop my circular images; 1 with and 1 without fingers.
Who at VOL signed off on that? It makes me suspect all their engineering choices. A T/S lens is a complex thing and I'm not sure I'd trust Laowa to pull that off.
I don't know much about T/S lenses. I used one a few times back in the film days. They seemed finicky and I was never sure I was using them right. Plus, for less than the price of a Nikon T/S at the time, you could get a competent view camera setup.
Once digital came out and let me straighten things in post, I've never given a T/S lens another thought.
Laowa CP 4mm f.2.8 Circular Fisheye
Full frame, no fingers
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