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Hi Paul,
Nice Shot!
It seemed to me that you should have got more than that from 20 min of exposure at F7 so I took the liberty of downloading and having a fiddle. I hope you don't mind. If you do, I'll remove it.
Indeed there was more. It is a pitty that you have clipped the bottom end other wise there may be more still. Did you use dark frames on this? There was some residual amp glow that made it difficult to stretch any further.
Again, hope you don't mind.
Cheers
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