the problem with using these as a finder is usually that they come with a momentary contact button (ie. you have to hold it and press down to light the light, then when you let go the light goes off). during this time the beam is bouncing around from your hand shaking. so i got mine with an extra accessory: a click on, then click off button switch fitted to the screw on battery cap at the back end of the 'pen' shaped pointer. which by the way is graphite colored and comes in a wooden box with batteries.