Is the YENGUAN 90mm Telescope Worth It for Beginners?
Worth it for beginners, not for serious deep-sky viewing
around $200price at time of review — check Amazon for current
- Worth it ifYou want a simple, grab-and-go scope for the moon and bright planets
- Skip it ifYou're after faint galaxies, nebulae, or serious astrophotography
Amazon shoppers rate it 4 out of 5 across 227 ratings. That is their number, not ours.
By Maya Bennett, kitchen & home · updated 2026-07-28
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You've stood in the backyard, pointed your phone at the moon, and gotten back a blurry white smudge for your trouble. So you start hunting for an honest telescope review before spending money on something that might just end up in the closet, wondering if an actual telescope would show you what your eyes only wish they could see.
Here's the trick with this one: the aperture, that 90mm objective lens up front, does more work than any of the eyepieces. Aperture is basically a light bucket, the wider it is, the more light it gathers, and light is what turns a dim gray disc into a moon with visible craters and shadow lines along the terminator. The 800mm focal length behind it stretches that light out, which is what gives you magnification once it passes through a Kellner eyepiece. Swap eyepieces and you're changing how much of that stretched image fills your eye, not how much detail exists in it, that's set by the aperture. The altazimuth mount keeps things simple: up, down, left, right, no equatorial alignment to fuss with, which matters because fumbling with a mount in the dark is how first telescopes get abandoned. The finderscope is the unglamorous part that actually decides whether you enjoy the hobby: a straight-through sight so you can find Jupiter before you try to center it in a lens showing a much narrower slice of sky. The phone adapter turns that view into a photo you can actually show someone.
So the real purchase here isn't magnification, it's light. A bigger number on the eyepiece box means nothing if the aperture behind it can't gather enough brightness to fill it in, and 90mm is enough to make the moon and the brighter planets genuinely rewarding without asking you to learn an equatorial mount first.
Worth it if
- You want a simple, grab-and-go scope for the moon and bright planets
- You're buying for a beginner or a kid and want an easy first setup
- You'd like to snap phone photos of what you're viewing
Skip it if
- You're after faint galaxies, nebulae, or serious astrophotography
- You want a mount that tracks objects automatically
- You're already comfortable with an equatorial mount and want more aperture
Not for anyone chasing deep-sky detail or astrophotography beyond the moon and bright planets.
If you or your kid want to point something at the moon and Saturn's rings on a clear night and actually see them, this is a quiet yes, the altazimuth mount and finderscope make that easy on the first try. If you're hoping to resolve faint galaxies or shoot long-exposure astrophotography, this aperture and fixed focus won't get you there, and that's a different, much pricier hobby.
Check price on Amazon · around $200 or Add it to your Amazon cart to sit on it
Before you go
Can this telescope see planets clearly?
Yes for the brighter ones, the 90mm aperture gathers enough light to show Saturn's rings and Jupiter's bands, though fine detail on smaller or dimmer targets is limited.
Does it work with a phone camera?
Yes, it includes a phone adapter that mounts your phone's camera to the eyepiece so you can photograph what you're viewing.
Full spec sheet
| Eye Piece Lens Description | Kellner |
|---|---|
| Mount | Altazimuth Mount |
| Focus Type | Fixed Focus |
| Finderscope | Straight-Through |
| Compatible Devices | Smartphone |
| Coating | Fully Coated |
| Focal Length Description | 800mm |
| Additional Features | Advanced Optical System, Versatile Magnification, Intuitive Setup, Portable Constructio… |