Eye Piece choice
Posted 22 August 2013 - 09:29 PM
Posted 22 August 2013 - 10:18 PM
But the high power ones are usually 1.25". There's not much reason to go to 2" for high power. You get the same view with 1.25" eyepieces. You can always get a medium power 2" eyepiece and then get a 2" barlow (2X or 3X) to give you the high power you're looking for.
The ES 18mm is a 2" eyepiece and does excellent in my F/10 scopes. I also have a Celestron 8mm Ultima LX that is a 1.25/2" barrel eyepiece. The Ultima is big and heavy but it does great in my f/10 scopes. Don't know how it would do in your Dob.
Posted 22 August 2013 - 10:41 PM
Posted 23 August 2013 - 12:01 AM
Second choice, I recommend an 8.8mm ES82 for $100. Maybe the 6.7mm depending on the FL of your scope.
Or, since you have the FTRs, a used 8mm or 10mm Hyperion would be really versatile as well.
Posted 23 August 2013 - 02:19 AM
ES 68, 82 and 100s are great with short Newtonians. A ES100 9mm will give 2mm of exit pupil and it would be your workhorse. ES100 20mm (4.4mm exit pupil) to ES82 30mm (6.67 exit pupil) will be great finders and widefield eyepieces. Your max would be the ES100 5.5 or ES82 4.7 (much cheeper).
Since this is a premium telescope it would be a pity not to feed it with great eyepieces. You might just get three, or two and an Antares 1.6x barlow since you don't want to spend much, but don't avoid good widefields that will permit you to track easier and observe better.
Posted 23 August 2013 - 05:39 AM
Consider used to save some $$$ and do consider a Paracorr or Baader MPCC
Posted 23 August 2013 - 05:48 AM
Posted 23 August 2013 - 10:27 AM
Congratulations on the scope, and you have my sympathy regarding your budget.
For minimum cost, I'd suggest that you should just get a good Barlow for your 13 Hyperion. Usually, a Barlow will help clean up the eyepiece deficiencies. If you don't like coma, the paracorr might be the next priority. If you can accept the coma and you really want a decent high power eyepiece, then I'd encourage you to wait and save for a used Delos/XW. That would be cheaper in the long run.
Probably the best route will be to wait for the scope and try your current eyepieces with it. Once you've used it, you will have a better idea of what you really need (and your spouse's tolerance).
Posted 23 August 2013 - 11:02 AM
Posted 23 August 2013 - 03:41 PM
Choice 2: a good 9mm eyepiece
Choice 3: a good Barlow.
I'll leave it up to others to make suggestions on brand and model.
Posted 23 August 2013 - 08:43 PM