Nikon Nikonos III with 35mm f2.5 lens mount_Praktica Electronic These tubes have the electronic

These tubes have the electronic contacts necessary to maintain autofocus and autoexposure capabilities

as you might imagine

This extension tube provides a slightly inexplicable 200mm extension for LTM/39mm threaded lenses

There is also an outside semi-collapsable compartment capable of holding squishable items

Nikon Nikonos III with 35mm f2.5 lens mount_Praktica Electronic These tubes have the electronicThe Nikon Nikonos III is the last of the Calypso bodied Nikonos line, with several improvements in function most notably an improved bright frame viewfinder with framelines for the 80mm lens. It retains the grippy diamond textured rubber coating and fingertip shutter frame advance mechanism. Nikonos cameras were rated for submersion to 50m, but these cameras are 40 years old and we can't guarantee that they'll live up to that rating. Nevertheless,