Connection thread 31,8 female 42x1 and exited female lowered special for obJECTIVES 42x1 MTO 1000. Screwing it on the objective it concurs to insert the eyeglasses and other accessories with diameter 31,8mm (1,25"). For being able to use also the stellar diagonal, it goes ended up the screw of fine race of obbiettivo MTO 1000. We realize also the connection for normal optical 42x1 (you see offered in store). Moreover one comes true connections for eyeglasses on objectives of other grafts (to ask)