Eyepieces & Accessories
The accessories are the cheapest part of the setup and the part that changes the view most. A second eyepiece, a Barlow lens and a moon filter cost little and change what you see on a given night more than almost anything else. This silo covers the beginner accessory kit — eyepieces, Barlow, filters, finder scope, collimator and a red flashlight — and what is worth buying first. Specs are verified against manufacturer and current Amazon listings.
Eyepieces — start with two
The eyepiece is the small lens at the back of the scope, and it is what sets your magnification: the shorter its focal length, the higher the power. Most beginner telescopes ship with one or two, and the smartest first upgrade is simply a good pair — one low-power eyepiece (a long focal length, say 25–32mm) for a wide field that makes finding things easy, and one medium-power eyepiece (around 10–15mm) for detail on the Moon and planets. Skip the tiny super-high-power eyepiece that promises huge magnification; the sky rarely supports it and the view just goes dim and shaky. The specs that matter are focal length (which sets power), apparent field of view (how wide the window feels) and eye relief (comfort, especially if you wear glasses). The magnification calculator turns a focal length into the actual power and field you'll get on your scope.
Barlow lens — doubles your kit for a few dollars
A Barlow lens slots in ahead of any eyepiece and multiplies its magnification, most often by 2×. That one cheap accessory effectively doubles your eyepiece collection: a 25mm and a 10mm eyepiece plus a 2× Barlow give you four useful powers instead of two. It is the single best-value addition to a beginner kit, which is why a Barlow anchors the best telescope eyepieces guide alongside the eyepiece picks.
Filters — moon, colour and (carefully) solar
A moon filter is a cheap neutral-density filter that dims the dazzling glare of a bright Moon so you can pick out craters and detail comfortably. Colour filters lift specific planetary features — a light blue can sharpen Jupiter's cloud bands, for instance. Solar viewing is a different and safety-critical matter entirely.
Finder scope, collimator and red torch
The supporting cast each fixes one small frustration. A finder scope (or a red-dot finder) helps you aim the main tube at the right patch of sky — without one, finding anything is luck. A laser collimator aligns a reflector's mirrors, a quick job that keeps a Dobsonian or Newtonian sharp. A red flashlight lets you read a chart without wrecking the dark adaptation that took your eyes twenty minutes to build — white light undoes it instantly. None of these is expensive, and together they turn a fiddly night into a smooth one.
Featured guides
The current published guides in this silo. More land each batch.
Landing next: Best Barlow lens, Moon filter guide, Best finder scope, Laser collimator guide, and Telescope filters explained.
Frequently asked questions
What telescope accessories should a beginner buy first?
Start small: a second eyepiece (so you have a low and a medium power), a Barlow lens to extend that range, a moon filter to tame the Moon's glare, and a red flashlight to protect your night vision. Those four are cheap and change the view most. A finder, collimator and more eyepieces come later, as you need them.
What does a Barlow lens do?
A Barlow lens fits in front of any eyepiece and multiplies its magnification, most commonly by 2x. That effectively doubles your eyepiece collection for a few dollars: a 25mm and a 10mm eyepiece plus a 2x Barlow give you four useful powers instead of two. It is one of the best-value accessories a beginner can add.
Do I need a moon filter?
For comfortable viewing, yes. A full or near-full Moon is genuinely dazzling through a telescope — bright enough to leave an afterimage. A moon filter is a cheap neutral-density filter that screws into an eyepiece and dims the glare, letting you pick out craters and detail. It is one of the least expensive upgrades and one of the most appreciated.
Can I use any telescope to look at the Sun with a filter?
Only with a proper, certified solar filter fitted over the front of the tube — never a small screw-in eyepiece filter, which can crack under focused heat. Use only ISO 12312-2 certified solar filters and follow the manufacturer's instructions. Improvised filters can cause permanent eye damage. When in doubt, view the Sun only at a club event with proper equipment.