GSI Super Quality Remote Shutter for Pentax/Contax/Sansung/Canon Eos -- Pentax K100D super,K20D,K200D,K10D,ist Ds2,lst	MZ-L,K100D,ist D,ist DL,ZX-L,K110D,ist Ds,ist DL2,MZ-6, Contax 645,N,N1,NX,N digital, Samsung GX-1L,GX-1S,GX-10,GX-20,30,50,7,300D,3000 33,55,7s,350D,500N,Canon Rebel XSl,450D,50E,500,300,300X,300V,400D,/Xti/XT,Elan7/7N/7NE/II/IIE/T2/Ti/X/XS/G/2000 Cameras, Functions Exactly as the RS-60E3, Provides Great Photography Flexibility Prevents Camera shaking in Close-Up Macro Photography, and Super Telephoto Shots Absolutely a Must for Night Shooting or for Difficult Approach-to Pictures Two-stage release button - halfway pressing for auto focus and complete pressing for shutter release Button locking for bulb exposure by pressing completely and sliding forward - easy for long exposure and continuous shooting Support synchro-cable to control 2 cameras simultaneously,