We've recently got our hands on an anamorphic lens to try and capture some more cinematic images in a small form factor. The lens is from Moondog Labs, a firm based in New York that has been producing lenses for over a century. Here is a very short clip. Straight out of the camera (iphoneX) using FilmicPro. No colour correction, no filters, luts etc.
The lens is a 1.33 anamorphic. With the FilmicPro app, you can de-squeeze in camera, so the image you see is in the correct aspect ratio. With this lens, you can buy a camera case which the lens will screw directly into. The lens itself comes with a lens protector and also a back cover, that goes into a soft bag. However, the first thing I got was a small hard case to store and protect it.
So you can go hand held, but my current setup is the Zhiyun SmoothQ gimbal to give steady footage. Due to the weight of the lens, you will need some counterweights that magnetically link together and go on the other end of the gimbal.
If you want to keep the shutter speed down, to say 1/48 if shooting at 24fps, you will need an nd filter. To attach this you will need an adapter to go from the lens to a standard 52mm connector. You can then screw in any nd or variable nd filter. With FilmicPro you can then adjust the shutter speed, otherwise when shooting outside, everything will be overexposed at 24fps. FilmicPro can also shoot log profile.