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Hi Chunky. I'll answer your first question. I would definately go the APO barlow. I have both APO & achro barlow...suffice it to say, I dont ever use the achro anymore.
I think a fan is a must! Although I cheat these days & stick the OTA in an airconditioned room until it's the same temp as outside. as the temp continue's to fall, I stoke the fan up every 30 mins or so.
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