Zacuto Z-Finder Pro 2.5x

The Z-Finder has clear glass and looks and feels like a quality product, but its flaws make it aggravating. I bought it to use for still photography with my Zeiss manual focus lenses, and once everything is in place and adjusted properly, it does its job making focusing of landscapes or micro work easier and more accurate than the camera's ground glass viewfinder. However, even after following the directions on the Zacuto video, the spacers are impossible to separate, without great force (more force than my arthritic hands can manage). I have broken tabs off of three spacers. Two more are in questionable shape after being forced. The adhesive mounting frames which are supposed to stick over the camera's screen did not stay stuck. If the plastic bits fit less aggressively, perhaps the glue would stick. The tabs used to attach the mounting frame are too short to be of use with my "tall" camera body, so that isn't a good option when the glue fails. The rubber bands work with a small camera, but are too short for the tall one. Finally, the focusing ring barely changes the diopter. It might as well not be there for all the good it does. I should have returned this device, but after one evening's struggle with it, it looks like it's ten years old. In my more than 50 years of photo work, I have not disliked a piece of equipment as much as I do this. I will use it to check the focus of shots I have already taken, but it's unlikely I will use it as intended. If I were willing to dedicate one camera body with the Z-Finder permanently affixed, then I'd have no complaints except for the inadequate diopter adjuster. I have never written a negative review before, but I am disappointed enough in this product to suggest that others not purchase it until there have been some changes made in the design. I realize that it is a delicate balance between fitting too tightly and not tightly enough. In this case there's ample room for improvement. It's a fine idea that is not executed as well as it should be considering the cost. If I do permanently mount it to my D800, it will be a fine gadget, but I am unwilling to tie up a camera in this way.