[ICA-HM127] Does the adapter of the attachment have to install with lens on ICA-HM127?

If you use the lens which not of the attachment for the ICA-HM127, you don’t need to install the adapter (ring) at the device, but if you change the lens to the C-mount type, the adapter must be installed. Please note after you installed the adapter, don’t lock the lens too tight, otherwise it maybe result the adapter stuck at the camera.