In the late 1990s I bought a Vivitar Series 1 19-35mm zoom for my Nikons. For an inexpensive lens I've been pleasantly surprised with the results I've gotten. I used it not long after I got it to take some great pictures while staying on the Queen Mary in Long Beach, CA. I usually use my Nikkor 20mm prime, but having the zoom in those confined quarters made it easier framing a lot of photos. I've since bought the 15-30mm Sigma, and I like it a lot, but find it rather large and heavy, and find using filters (in the rear gel holder) a bit of a pain. So I still go back to the old Vivitar as a favorite. With a red filter on partly cloudy day in the winter, with lots of great trees....one of my favorite times for picture taking.