Summary: I am only an amateur photographer who enjoys fooling around with his great Nikon P5100 point & shoot to accomplish all sorts of useful jobs and entertainments. I wanted this lens as much to experiment with as to accomplish anything in particular but was pleasantly surprised by its excellence. Also, as an amateur who knows only a small fraction of what this gear is capable of, I was not interested in investing any money.
Summary: As you would expect from a Nikon lens it's wonderful. What keeps it from getting 5 stars from me is that when using it with a P5100 camera the internal zoom is almost useless because if you put your camera on no zoom at all you see a circle in the middle of the screen. You need to put it from 60-90% zoom on your camera in order to have the image fill the screen. Also the camera will not focus if you try and use the digital over zoom.
Summary: I got this item wondering how good a converter lens might actually be, I expected degradation in the image because of the additional glass. I also wondered why Nikon would make me pay more by using ED glass. However, when I began to use the tele-converter more, to my surprise the tele-conversion actually makes the existing lens better!
Summary: I take anywhere from 100-500 pictures in a month. i have used this lens several time. if you are looking to get close to you subject from far this one works great. picture quality is amazing and really is worth the money if you take enough pictues. Bottom line is if you get out enough and love nature like i do, this can't be beat with my nikon 4500.
Summary: . . . but once you adjust to the fact that you can not use the view finder, you will be pleasantly surprised at how good this lens is. Nikon has always been the leader with their lenses and this baby keeps up the tradition. Top of a skyscraper, piece of cake; a picture of the Jersey shore up close while you're standing on the Manhattan side, it looks like you were standing only a few feet away from the subject, not miles. The clarity of the finished pictures is awesome.
Summary: In the 6 months that I've owned the 3x teleconverter I have been happy with it's performance. I had been frustrated taking photos in the great outdoors, as my subjects frequently showed up as specs in my prints. To a great degree, that has now changed. This summer marmots, deer, mountain goats, friends, flowers, fungus, and more have easily filled my frames. Some advice to those who buy: use a tripod and make sure your subject has plenty of light.