using a laowa fisheye 4mm 2.8 lens on a canon r7 lens

[Tommyboyks]

I recently bought a Laowa 4mm 2.8 fisheye lens with RF mount to use on my Canon R7. Every time I try to take a photo, the shutter will not depress. I have tried every camera setting I can think of, have removed the lens and reattached it several times , tried to take photos from different distances, and the shutter will not engage when I try to take the photo. The only feedback I get on the camera display is a waving hand. Anyone have any suggestions?                                                 

[normadel]

While your lens has an RF mount, it does not have any of the electrical contacts that a digital camera needs to connect with.  So the camera doesn't know there is a lens and doesn't want the shutter to fire. To use this all-manual lens on the R7, you have to look for the Custom Function setting “Release shutter w/o lens” and select it.

Do you have the user manual for the camera? You will find this information in it.

[ebiggs1]

You need to set the camera to "M" manual shutter and "Release shutter w/o lens" .