(actually had it, but returned it for a replacement this week, because of an issue, but like the gimbal a lot. I'm also a gimbal user, with the DJI RS2 but also getting the new DJI RS3 mini. Not cheap, but I plan to buy the Sony 16-35mm F4, which has a power zoom, making it ideal for video and is light weight and reviews state it's a good lens, albeit a bit expensive. My Samyung 12mm is a manual lens, so it doesn't autofocus and I'd be a bit close to set it on one spot. I have a similar situation, having just bough a full frame Sony while still owning my crop sensor Sonys, but I don't plan to video myself while walking, but if I did, I don't own a suitable crop lens that would be wide enough. maybe 12mm, which would be the equivalent of an 18mm in full frame. Since you mentioned you wanted to walk around videoing yourself, you would want a wider lens. So if you buy a crop lens, you would want a wider lens, as when you apply the crop factor, then multiply the stated lens factor by 1.5 to figure out what your equivalent perspective is. What that means is the perspective of the image will be like using 1.5 factor, or a 36mm lens, thus your video image will not be as wide. If you used a 24mm crop lens, then that lens only uses the crop sensor size equivalent of the full frame camera. so if it was a 24mm lens, the perspective of the video frame will be 24mm. One that comes to mind, is if you use a full frame lens, it will actually put the image across the whole full frame, and then downsample it to the video frame size. There are probably lots of technical differences, between shooting video with a full frame lens, versus a crop lens. I'm not an expert, but I think for what you plan to do, it will be fine.
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