of course you can still buy the sigma 14 f1.8 in ef mount. i picked up a like new copy last year for $800. i sold the lens once before but i won't make that mistake again. there's a copy on mpb now. when i shoot astro i carry camera, tripod and one or two lenses. the weight of the optically excellent sigma 14 1.8 is not a factor to me. i have the 14-35 for regular landscape workThe sigma 14/1.4 was never out in the EF mount. Only the 14/1.8 was released for the EF mount, and it's not even available anymore. Do you propose to take a time machine back and purchase one?
Not to mention that this simply is not "just" an astro lens
But using your astro example, in many cases, you need to hike to your location. I'm sure a few people wouldn't mind shaving bulk and weight off their kit if it even was available, or the poor disadvantaged person decided to use the sigma 14/1.4 with a Sony camera.
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