Eyepiece Suggestions for 8" LX10
Posted 09 April 2013 - 04:54 PM
I'm also thinking about picking up a Meade Series 5000 2" dielectric star diagonal for the sake of eyepiece flexibility. Any thoughts on this unit in general and/or using a 2" diagonal in the LX10 specifically?
Posted 09 April 2013 - 05:09 PM
Posted 09 April 2013 - 05:14 PM
Posted 09 April 2013 - 05:22 PM
Posted 09 April 2013 - 06:01 PM
Posted 09 April 2013 - 07:21 PM
With the 2" diagonal you could get a $160 40mm Astro Tech 70 degree Titan Type II eyepice, which will give you 50x with a true field of view about twice as wide as that plossl. This is the best reason for getting the 2" diagonal.
Personally I think the 6.3 reducer is a lot more trouble than it is worth. I have one and never use it. Good for astrophotography but not really needed for visual use. It does work pretty well for DSO viewing but you will want to remove it for viewing very faint DSO's or planets. It is just a another piece of glass in your view. It will significantly reduce coma at the edge of the field, but you cannot use it with longer focal length eyepieces. I find it will work ok with a 17mm 100 degree and a 22mm 82 degree or a 24mm 68 degree. Bigger than that causes more edge issues than the coma that is being eliminated. I have also noticed that the Meade and Celestron 6.3 reducers don't seem to be coated very well because they add some glow and reflections when combined with some eyepieces.
Posted 09 April 2013 - 07:24 PM
Posted 09 April 2013 - 07:45 PM
Posted 09 April 2013 - 10:44 PM
A 40mm SWA like the one Lane suggested or a 50/55mm plossl will give a wide field and larger exit pupil. Or go with the focal reducer and a 24mm SWA or 32mm plossl. Shorter focal length eyepieces will give more magnification and darker sky background, which helps in light polluted areas (i.e. 40mm SWA or 24mm SWA with reducer). Longer focal lengths give brighter images, good for dark sky sites (i.e. 55mm plossl or 32mm plossl with reducer). Once you figure out your low power finder, you can work your way down from there to your high power eyepiece. An 8mm would be a pretty good high power eyepiece for the scope, or maybe a 5mm if you plan to leave the focal reducer in all the time. (You can always take the reducer out to get high power with the 8mm.)
Posted 10 April 2013 - 02:59 AM
Posted 10 April 2013 - 01:32 PM
Posted 10 April 2013 - 04:52 PM
If I'm understanding correctly, it sounds like I'd be better off with a 25mm and a Reducer/Corrector than a 40mm due to the correction for coma (assuming the FOV is the same). Am I getting this right or am I missing something?
I've been WAY on the sidelines from astronomy for the last 35 years and a LOT has changed. When I stepped away Orthos ruled and Plossls were just becoming popular. At that time the Plossls were double the price of the Orthos (go figure).
 I'm sticking with 1 1/4" for now.
Posted 10 April 2013 - 05:23 PM
Posted 10 April 2013 - 06:45 PM
George are you in the North Houston Astronomy Club? They are based in Kingwood TX. With 160 members I guarantee you someone has a 6.3 focal reducer you can borrow and use at their dark site. You could also try out 2" accessories on your scope or someone else's 8" sct. That will give you a better idea of what the benefits and problems are with each approach. This is also a good way to check out eyepieces before you buy them.
Posted 11 April 2013 - 01:33 AM
Thanks again for the valuable info everyone. And Rogue, thanks for the link to the Meade deal. I missed out on the $159.99 but this is about as good as it's gonna get I think, so I sprung for one.
Glad to help. I really think you will like the 24 UWA eyepiece. I pulled the trigger on this package deal mostly for the diagonal but was pleasantly suprised by both. The build quality is not quite as good as the ES eyepieces but the views are really good. I decloaked mine to shed some size and weight. Here is a thread on how to put it "on a diet". It is really easy to do and allows you to store it in a bolt case for better protection.
Posted 11 April 2013 - 08:19 AM
Posted 11 April 2013 - 09:43 AM
Posted 11 April 2013 - 10:47 AM