This super hot deal is back: Adorama has the Sigma Art 18-35mm f/1.8 DC HSM for Canon for only $529.00. This matches the lowest price we have seen on this lens. Please note this is a DC lens for crop sensor bodies only. According to Adorama’s site, this deal expires today 07/19.
Super Hot: Sigma Art 18-35mm for $529 at Adorama (Today Only)

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Has anyone used this lens for astrophotography? I’m looking for a good lens for my 80D that is good for landscapes and astrophotography and this lens seems very good for this price.
according to Ian, it’s pretty good “One stand out lens available for all APS-C DSLRs is the spectacular Sigma 18-35mm f/1.8. It’s the fastest standard zoom ever made and its performance for night photography is nearly perfect.” ( https://www.lonelyspeck.com/lonely-specks-ultimate-list-of-best-astrophotography-lenses/)
Dustin Abbott liked it as well for that purpose