It is quite rare to get a large enough area of sky filled with the right kind of crystals to get a full halo display.
It is much more common to get parts of different halo effects over a period of several hours.
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This display started with a brief glimpse of circumzenithal arc through lower clouds.
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Twenty minutes later milky cirrus lower down down in the sky gave this sundog with a white tail going off to the right.
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Half an hour later the appearance of the cirrus had changed again, giving this upper tangent arc and pair of sundogs.
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Although the cirrus was streaky more of the 22 degree halo was visible.
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Three hours later with a fairly high first quarter moon a full 22 degree halo was visible.
Had it been a full moon the halo would have been much more obvious.
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Canon EOS 20D 2nd May 2009
Wiltshire, England