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I agree with Rick.
Better to get a larger sensor. You've already got about the widest FOV you're going to get easily. FSQ106ED are more like US$4300 + shipping, exchange rate and GST so more like AUD$7500.
QHY is bringing out a 16.2mp camera with OAG and filter wheel like a QSI for US$4K later this year. Its 28 x 18 or something similar. google QHY16200A.
6 micron pixels would suit widefield short focal length very well and your refractor should be able to handle that size chip without trouble.
An 8 inch F4 Carbon tube Newt would be 800mm focal length.
An STL11 comes up every now and then but they typically go for US$3800 to US$4300 depending on condition, filters, accessories.
Astro cameras are very expensive.
Greg.
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