130mm-150mm f/5 portable newtonion?
Posted 28 January 2004 - 07:43 AM
Posted 28 January 2004 - 11:01 AM
Pros: Reasonably-sized OTA, not overly heavy. Cools quicker than an SCT or Mak. Rides fine on the CG-4. Nice wide views with 32mm Plössl, but higher magnification possible. No false color.
Cons: Slower to cool than a refractor. Collimation more critical in f/5 design than slower scopes. 150mm aperture leads to aperture fever (slippery slope).
I'm very pleased with mine, especially after adding a RA motor.
Posted 28 January 2004 - 05:00 PM
Packing it up for travels a snap too.. 15 min TOPS for complete setup..
Aperature fever is DEFINATE in using a 6. I'm a prime sufferer of it, and I've only had mine 2-3 weeks.....
Posted 28 January 2004 - 05:26 PM
Collimation will be important. As long as you keep collimated, planets will look great. I pushed 278x on Saturn the other night with my 8" f/5, and was a amazed at the view. Cool-down, as jeff says, will be longer than a refractor, but with the aperture you're considering, it won't be that long (probably < 1/2 hr in many occasions). My 8" cools sufficiently in under 45 mins usually.
Posted 28 January 2004 - 06:33 PM
I would go with the 6 inch, for sure, if it meets your portability requirment.
Posted 28 January 2004 - 09:18 PM