Review on Sigma 85Mm Lens Canon 321954 by Ashley Belehar

I bought this lens for astrophotography to get a slightly wider field of view than my Samyang 135mm. The reviews for this lens were good and I spent several nights photographing the Orion Nebula. It could be seen that with the aperture wide open (f/1.4) all the bright stars in the viewfinder look purple. Looking at the footage afterwards, large purple halos can be seen around all of the bright stars. This effect persists until about f/2.8, so you actually have to close the lens to avoid it, undermining any reason to buy such a fast (f/1.4) lens. I've contacted some other owners of this lens online and they reported the same issue with their copy, so it's a design issue. I would have sent it back but it was too late so I'm not too happy with the purchase. I think this lens is good for portrait photography, but for astrophotography I would look elsewhere.