Originally posted by Dale From memory it was taken the day or so after my DA14mm arrived in the mail. I'm not sure if the image would benefit from some tweaking in LR to pull out the underexposed road. Funny enough I have not seen a sun halo since.
With reference to rainbows, I've seen a fair few rainbow halos when above light cloud in the hang glider. And, no, I have not taken up the K10D with the 14mm to try get handheld shots!
You should get one of those helmet cameras!
Technically speaking, these are not halos, but I know what you men. Or actually, there are two separate possibilities:
1) Either a normal rainbow. But because of your high position you can see a whole circle (in very low positions you see less and less of the ark). How to recognise it? It is centered around your shadow with the highest light intensity at a distance of 40-42 degrees from centre (the shadow).
2) A Glory. Like for a rainbow you see a circular spectra, also centered around your shadow, but only at some 5-10 degrees from the shadow. The process is disputed, and it appears that it can be either droplets or ice chrystals that cause it. In some occasions you can see a glory around the shadow of someones head, which may be the origin of different mythological ideas about glorys.
In case you want to spot the glory without being a hangglider, figure out what will be the shadow side of the airplane when you fly somewhere and book a window seat on that side. It is quite common. Keep on watching the air plane shadow as it move over the cloud tops, and you will eventually spot it.
That DA14 is one lens Pentax should release in a WR version...