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I'm currently testing the new and quite affordable QHY533m (for h-alpha solar imaging).
First impressions are very positive. Good QE with no amp glow. That said, you might want to move past the "cheap" price tag, as a less affordable but far more capable option won't have you regretting your decision in a remarkably short time of frustrating use with a "cheapie". (183 based sensors have significant amp glow)
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