I have used this very little, however, it functions well with my spotting scope, it will fit other scopes and fits securely on my Swarovski binoculars. The few pictures of birds I have taken have been impressive. I have a friend who was about to purchase this product but due to tapered eyepieces on his (Nikon) binoculars it fit less securely. My primary use of a spotting scope has been game scouting and bird watching, however, getting up a bit in years I no longer hunt Dall Sheep and bird watching is the primary focus. My primary focus is taking photos of unusual species or specimens I observe and want to document versus always searching for a photo opportunity. I read many reviews prior to purchasing, decided this fit my needs and being adaptable to various optics was just another selling point. Good product and easy to use!