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Lee,
I went for an ASI 183mm for solar...
Great camera compared well against my ASI 174 but end up returning it due to "issues" with Ha fast frame imaging. (replaced by an ASI 1600)
Notwithstanding that, ZWO do a good job with their cameras.
The smaller pixels (2.4 micron) on the ASI 183 would favour shorter focal lengths.....
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