When I bought my first 8 inch Dobsonian, the two stock Plossls felt fine for a month. Then I borrowed a friend’s Tele Vue Delos and could not unsee what I had been missing. Over the next year I upgraded my eyepiece kit one piece at a time and tracked what each change actually delivered.
| Eyepiece | Focal Length | Field of View |
|---|---|---|
| Tele Vue Delos 14mm | Mid power workhorse | 72 degrees |
| Explore Scientific 82 Degree 11mm | Wide planetary | 82 degrees |
| Baader Hyperion 24mm | Low power finder | 68 degrees |
| Tele Vue Nagler 7mm Type 6 | High power planetary | 82 degrees |
| Pentax XW 30mm | Deep sky widefield | 70 degrees |
Start With Your Workhorse Eyepiece
The eyepiece you use 70 percent of the time on most nights is your workhorse, usually somewhere between 12mm and 16mm. I replaced my stock 10mm Plossl with a Tele Vue Delos 14mm and it changed every observing session. Sharper stars to the edge, no kidney bean blackout, longer eye relief for glasses. If you upgrade nothing else this year, upgrade this slot.
Then a Low Power Widefield
Your finder eyepiece is what you use to sweep the sky and locate targets. A wide 24mm to 30mm eyepiece with a 68 degree or larger field makes star hopping much faster. I added a Baader Hyperion 24mm second and immediately started finding Messier objects without consulting my chart every two minutes.
High Power for Planets and Doubles
Only after the first two upgrades did I add a high power eyepiece around 7mm to 9mm. I picked the Tele Vue Nagler 7mm Type 6 and Jupiter showed festoons and belt detail I had never resolved before. Do not buy this one first because most nights the seeing will not support it, but when conditions are right you will want it.
Skip the Barlow Most of the Time
A 2x Barlow is often pitched as a way to double your eyepiece collection. In practice, a good dedicated eyepiece beats a budget Barlow stacked on top of a budget eyepiece. I sold my Celestron Omni Barlow after a year because it never came out of the case once I had three quality eyepieces covering the range.
When to Go Premium Wide Field
Pentax XW and Tele Vue Ethos territory is real money. I held off until I had used the rest of my kit for two years and knew exactly which gap I wanted to fill. A 30mm Pentax XW for sweeping the Milky Way is worth it if you observe under dark skies often. If you observe from suburbia, a budget 25mm Plossl will do most of what this eyepiece can do.
How to Choose
Buy in this order: workhorse mid power, low power widefield, high power planetary, then premium widefield. Spend more on the first eyepiece than feels comfortable because it is the one you will use most. Match the eye relief to whether you wear glasses at the eyepiece. And do not buy a full set on day one because your scope and your eyes will tell you what gap to fill next.
Frequently asked questions
Should I buy a 2 inch or 1.25 inch eyepiece first?+
Buy 1.25 inch first unless your scope only accepts 2 inch. The widefield benefit of 2 inch eyepieces matters most at long focal lengths above 30mm.
Are stock eyepieces really that bad?+
Stock Plossls that ship with budget scopes are usable in the middle of the field but soft at the edges. A single mid range eyepiece upgrade is the most obvious improvement most people will ever make.