Robert can you post a screen capture of the histogram?
What mode and ISO are you shooting in ?
I use P mode at ISO 100 and this usually adjusts the exposure to give me a histogram like the one attached.
I do dawn sky flats.
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What's wierd is that the frequency of the spike shifts across the entire spectrum range as I change the exposure time. I can't work out what's going on. If I take the t-shirt off I get a normal histogram well spread out and not totally saturating the histogram. I'm stumped. HELP!
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This sounds logical, because
you are changing the exposure time so the histogram will shift up or down.
And when you take the t-shirt off, it will give you a full histogram, (whatever colours it sees, full spectrum).