Asahi Optical Co. Extension Tube set for AsahiflexThis is an original Asahi extension tube set for the Asahiflex camera and its M37 lensmount. Includes four tubes of varying lengths that can be used alone or in combination to increase close up capability with compatible lenses (that is to say, Asahiflex lenses with an M37 lens mount.) In excellent condition, with original case. Please note that this tube set will not mount to the more common M42 thread mount without an adapter, which is not included