Thanks for the advice. I was originally going for the 6.7mm but I recently bought a Bintel 2x ED barlow so I thought I'd use the 8.8 then barlow if I made it out to a dark site. I'm undecided because I'm in my yard in Inner Sydney most of the time so the 6.7mm might get more use? Cheers.
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Originally Posted by MortonH
I wouldn't use the Hyperion or Stratus for planetary unless your Dob has tracking. Edge performance will be quite poor. I had the ES 8.8mm and it is good. I now have the Pentax XF 8.5mm.
Are you sure that 8 - 9mm will give you the magnification you need for planetary? I might have thought that something in the 6 - 7mm range might be better, depending on the seeing conditions where you observe. Explore Scientific does an excellent 6.7mm model.
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