
I wanted to get a long zoom for Wildlife and Astonomy Photography. I was trying to decide between the Sigma 150-500 OS or the 50-500. I saw the 50-500 was getting an update with OS later this summer so I started favoring this focal range. I found a lot of video reviews on the 150-500, but a lot of article reviews on the 50-500. The argrument for either is compeling, but I finally decided on the 50-500 due to the range. Boy am I glad for that. One day at the Cleveland Metropark Zoo convinced me. I miss the OS for the long shots, but the written acrticles were correct, one needs to learn proper holding technique. I have really learned a lot about depth of field/focal length/ISO/standing and supporting technique. If nothing else it is a life time tutorial on technique for just over $1000.00. I could have waited till July for the OS version, but that is not me. When I get something in my head I have to have it. Prior to the zoo trip I had considered returning it and waiting, but I did not and am very happy with that decision. I love the focal range and the fact Sigma includes a hood and tripod mount.I use the trek-tech monopod system and it works great. I rigged a small strap on the dedicated strap bar on the lens so I can use my R-Strap system with it, rather than the supplied strap.
Dislikes are limited to weight (heavier than I thought, but what do you expect for the range so not really a minus). Also when I open the lens wide open at 500mm, it has trouble focusing. My fix, zoom out a little-focus-zoom back in-focus.
Accessories I would recommend: Kenko extension tubes (makes it a macro lens), Trek-tech monopod/magnetic system, and the r-strap(gerry-rig until black rapids and trek-tech get the rumored combo mount out).
This lens is a wonderful learning tool. Should you wait till the os version comes out? If you have $600 for it yes, if not buy the lens and get out shooting. Cleveland weather is warming up and I want to get out an shoot.
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