Posted 26 May 2012 - 10:09 AM
The camera would have been turned anticlockwise to take this, I'll wager, which meant the onboard flash was at lower right. Any small bit of dust* just in front of the lens would have caught the flash and appeared lit up exactly as shown. It could also have been on the lens (and might have been quite tiny)..
* Or perhaps some glitter might be a bit more likely..
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All my posts about Apollo are dedicated to the memory of MID - who knew, lived and was an integral part of, Apollo.