I recently purchased a Sigma 14mm f/1.8 DG HSM Art Lens for Sony E. My primary use will be for landscape and possible astrophotography. The lens weighs 2.6 pounds (1170 grams). There is no tripod collar and I am wondering about the stress on the e-mount. (The same question would also apply to the Nikon and Canon versions.) I spoke with Sigma this a.m. and they said it should be no problem. Any thoughts would be appreciated. Thanks.