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Thanks Peter. Yes thermal noise is a big problem here in the tropical summer, which lasts for a good 6 months. The DSLR is okay below 20C, but above that things start to get lost in the noise. But then summer is always cloudy here anyway. I might get half a dozen clear nights in 6 months.
Nothing much I can do about it in the short term. At least winter will give the DSLR a good run.
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