Eyepieces for Orion Skyquest xt 8 Dobsonian telescope?

blogadmin - Monday, 31 January 2011 05:24

Question by umar_fateh: Eyepieces for Orion Skyquest xt 8 Dobsonian telescope?
I have an Orion Skyquest XT 8. I just bought the telescope and i am new to astronomy. I want to know what eyepieces and filters will be better for best visual observation. I have two Serius Plossel eyepieces i.e. 6mm & 25mm.

Best answer:

Answer by starryskyn
Those eyepieces are fine for low power wide field (the 25mm) and high power narrow field (the 6mm).
You could get a filter for light pollution if you need them, or color filters for contrast of planets’ features, or a polarizing filter for helping with Moon views.

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  1. Commentswallyrush   |  Monday, 31 January 2011 at 5:27 pm

    You could get a set like these.

  2. CommentsSearch first before you ask it   |  Monday, 31 January 2011 at 5:37 pm

    As you may have already found, the 6mm can be rather uncomfortable to use. You should invest in a quality Barlow lens and maybe a couple more eyepieces. Most color filters are overrated.

    For high-power viewing of the Moon and planets, the best budget eyepieces are Abbe Orthoscopics. Their fields of view are smaller, but they are not as tight in eye relief as Plossls. Unfortunately, Orion doesn’t sell them, but they are worth looking into. Choose a 12.5mm or 9mm or both if you can. Antares is a good brand as well as University Optics.

    Orthos will give the sharpest view at the cost of field of view. When pushing a dob to track at high power this may or may not bother you. Some will opt for wide-field eyepieces that may not be as sharp as Orthos but are less work when tracking at high power. Orion has some reasonable options there. Or just barlow a longer length Plossl, say 20 to 15mm.

    If you have dark skies you could get a 32mm Plossl that will give you close to the maximum field for finding objects or viewing extended objects.

    If you live in light-polluted skies (you cannot see the band of the Milky Way) a filter such as the Orion Ultrablock will help for SOME objects like nebulae. But it will block the light of galaxies too, so that one won’t help for viewing external galaxies.

    For the Moon, a variable polarizing filter set is a must-have. You can choose how much you want the moon’s light dimmed, and you can use half of the filter pair to do daytime viewing of the quarter moon. It helps with Venus too.

    If you must get a single filter for planets, I recommend the Baader “Moon & Skyglow” filter as it does a fine job enhancing contrast on the planets. Not absolutely essential though.

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