Here is an example of a display where Moilanen arc intensity exceeds other halos. The arc is also sharp. If crystal sampling Moilanen arc displays has begun to feel frustrating, we still should carry the microscope with us: these kinds of displays are certainly worth a look.
The display was photographed by Harri Mänty on January 9 in Vantaa, Finland. The temperature was about -15 to -16° C. Click the image to see the rest of Mänty's photos.