Dear All, A collegue pointed his iPhone at the partially-eclipsed sun yesterday morning and sent me the result:
http://www.cl.cam.ac.uk/users/fhk1/Eclipse11.jpg It is clear that the camera wasn't stopped down anything like enough but why, he asks, does he get a pin-hole artifact of the eclipsed sun? At this stage of the eclipse the crescent was the other way round from the way it appears in the artifact. This is what one would expect from an image created by a pin-hole but not when printed and turned the right way up! Could this be an image of the reflection in the water? I know almost nothing about iPhone camera technology and cannot give a convincing explanation of the physics behind this artifact. There is also the surrounding elliptical red background to explain. Could that be an image of the hot front surface of the lens? Any thoughts? Frank King Cambridge, U.K. --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
