Originally posted by illdefined it would be the perfect match for the new 18-135mm WR. the 55-200mm WR isn't long enough to consider carrying it as another lens.
Agree completely. If I could choose only one consumer-grade lens for the WR treatment, it'd be the 55-300. I've actually been holding off on buying the non-WR variant ever since I got my K-7, because I know with my luck, the moment I bought it I'd find out I should've waited. Although conversely, with my luck the very fact I've waited will mean they never add WR to the 55-300. ;-)
Could it be that lens has some particular challenge that prevents it being adequately sealed? Too great an extension, perhaps, making it more likely that water will be ingested as the lens is zoomed back and forth?
Originally posted by Wololo How is that remotely comparable to a weather-sealed 55-300? One's a lightweight, affordable f/4-5.8 consumer travel zoom, the other's a heavy, expensive, constant aperture lens designed for maximum image quality.
Compared to the existing (non-WR) 55-300, the f/2.8 Sigma is almost six times the weight, has less than half the zoom range, and costs almost nine times as much. Even if we assume a WR 55-300 would be a little heavier and more expensive, the difference is still vast.
Edit: Oh, and I forgot to note -- it also fails the main criterion set by illdefined, in that despite the mammoth weight and cost, it's not weather-sealed.
This isn't comparing apples to oranges. It's comparing apples to lunar landers. ;-)