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Message: <blockquote data-quote="mikfoz" data-source="post: 1426700" data-attributes="member: 72221">I know this isn't the 150-500 zoom but here's a 100% crop of a pic I took today, hand-held, with a 50-500mm Sigma. Yes, there's built in image stabilisation in the camera body I use, but even so, there's not a lot wrong with the pic.I know the prime lens will always win out in the end if you nitpick far enough, but sometimes it's nice to be able to zoom out and not change lenses or miss the shot if the subject moves too close to frame properly. Most of us with a limited budget will get by just fine with a Sigma zoom and maybe reach such a stage with our long lens work that a prime lens is worth saving for. Getting one and then finding out you're useless at using it is going to be a very expensive mistake.PENTAX K10D, 1/1000s, f 1:9.5, ISO-140, 500mm focal length saved by camera as JPEG best quality so RAW would have been sharper still but I was just trying it out.</blockquote>