Quote:
Originally Posted by Omaroo
This effect still occurred when I was operating at f/10 and higher on a tightly-collimated SCT - forgetting about lenses altogether.
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I don't recall having a purple ring aspect to my D70 years ago. Before or after I modified it.
I saw a slight amount of magenta stars in a few of my recent night shots but then I see similar or worse using my Pentax 67 lenses with my monochrome Proline 16803.
I take that as a bit of CA. I don't see how the sensor causes purple fringing. There is no evidence of purple fringing in day shots.
The 800E in particular shows up CA in lenses that in the past were considered top notch. Its the "downside" of such powerful resolution.
It corrects quite easily using Photoshop selective colour adjusting the magenta and cyan sliders. I could even record an action to suit so I could run it on any shot I did with the camera.
If you look at Waynes images the 14-24 does not show much fringing at all (its the better of the lenses) and the Samyang shows more. I don't how this lens rates but it would appear to have more CA.
I could do a comparo as I have 40D and modded 20D as well with a Novoflex adapter so I could use the same lens.
It may take a little bit to do one but seeing as there is interest I'll make the time to do one.
Greg.