Wandering round an aquarium yesterday taking shots with a 70-210 f4.5 and it was struggling to cope with the low light (iso considerations aside), so went back to the car and changed over to a 17-50 f2.8 and thereafter every shot I took ended up as 3 images on the memory card.
Thinking as I write the above, did I accidently turn on bracketing but I don't believe this was the problem as the images were virtualy identical. The middle image of the three tended to have a slightly bluer look, but it was very slight and there was nothing to choose between exp 1 and exp 3.
Can anyone think what happened, or had a similar problem. I've yet to test the camera again so might have something to add later...
(edit to add. A200 with 70-210 Minolta lens followed by 17-50 Tamron)
Reality is merely illusion, albeit a persistent one. ~ Albert Einstein
To be conscious that you are ignorant is a great step to knowledge. ~ Benjamin Disraeli