The answer is yes. You can whack an EF-S lens on a full frame mirrorless camera & get a wider field of view than the lens was designed for. It's vignetted of course. The trick is to not completely attach the lens, so the camera can't communicate with it. Also, don't attempt it with a mirrored camera or it'll break the mirror.

There are adapters which shrink the projection of full frame lenses to a smaller sensor size. Their mane use is recording video on Canon cameras which can't use the entire sensor for 4k video. They cost as much as a new lens. The lion kingdom suspects the cost is a licensing fee Canon charges for abusing their lenses to project a vignetted image.

The lion kingdom really has no use for such an adapter. It's never wanted a vignetted image. The 17mm is still somewhat wide when the sensor is cropped. The resolution is high enough to defish the lion kingdom's cheap 15mm fisheye. The automated tracker should support the 4k mode though.

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