"Excellent service from Castle Cameras who not only gave me good advice, but despatched the order the same day. The tripod adaptor is very slim, but solid. In fact it's the only one I found slim enough to fit between the tubes of my Celestron 10X50 porro prisms. The turnscrew arrangement on the binocular end is a bit difficult to get my fingers to, so I'm using a small pair of pliers to tighten and remove it. Much easier this way. Excellent adaptor and now with the asistance of a tripod I can see Jupiters moons clearly without them jumping about all over the place."