questions about purple halos on my Sigma 85mm lens

Started 2 months ago | Discussions thread
EricTheAstroJunkie Contributing Member • Posts: 820
Re: questions about purple halos on my Sigma 85mm lens
1

lord_of_light wrote:

EricTheAstroJunkie wrote:

My copy of the Art 85mm was never that bad, in fact that's by far the worst LoCA I've seen on shots from the Art 85mm (even if it is wide open. I recommend stopping down the lens, do some test shots at f1.8, f2, f2.8 and see what happens. This is a shot I did with my Art 85mm on a Nikon Z7 at f2:

https://www.flickr.com/photos/75706432@N02/47998126918/in/dateposted/

I haven't found a great way to reduce the fringing in PixInsight, the fringing sliders in Lightroom do the best job (but you have to be very careful not to remove nebula color). Really the best strategy is to just avoid shooting lenses with such bad LoCA, either stop the lens down or get another copy. IMO you got a really bad copy of this lens, I haven't ever seen such poor LoCA from the 85mm before.

Very nice photo btw. Might I ask where in Utah this was taken?

Unfortunately this is an area I keep unposted due to the delicate nature of the land surrounding it (which is being destroyed by atv/OHV use after losing it's protective status a little over a year ago), it's not that hard to find with some googling, but the less it's out there on the webs the better for the landscape. Given what's happened to a lot of very sensitive places in the state I've really reverted to not sharing specific locations, we're really being overrun all over in Utah, just widespread use and abuse by people who have no respect for the land. It's heartbreaking seeing some areas I used to be able to escape to completely overrun with lots of damage to the landscapes.

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