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Hey, tried digging thru here and couldn't find much.
I recently bought a Sigma 150-500 for my K10. I remember reading that these heavy lenses have potential to rip the mount out of the camera, hense the tripod mounts on the lens body. Right now I took the stock strap from the K10 and have it looped weird into the tripod mount so it works, but it's not ideal. I use a hand grip on the body, and didn't know if there was a strap made specifically for tripod mounts for the big lenses that would be better to carry them around.
Thanks for the help