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An interesting lens! Strangely, it's a little lighter and shorter than the Sigma 150-600 Sport; is there any reduction in optical quality (the optical designs are quite different)? I am not convinced that a 10x zoom is all that useful in practice; I wouldn't mount this on a camera to use it at 50mm! However, I guess the point is that you have the option in the rare case that it is needed.

I would certainly buy either the 50-600 Sport or 150-600 Sport ... if it were available in K-mount. ☹️

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