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I agree with John and Steve, re how a good well cooled and well collimated 8inch reflector should outperform any 4 in refractor on planets. This is particulalrly the case with planetary imaging where images are stacked and poor seeing frames removed... the larger 8in apeture is more susceptible to poor seeing effects visually, but when this is removed through sorting and stacking video frames the full force of the 8inches greater resolving power can be realised, revealing far finer detail than the 4inch can physically resolve no matter how good.
cheers,
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