Apertura
Apertura AD12 Dobsonian 12" Telescope with Accessories
A 12-inch light bucket that ships loaded with the accessories others make you buy later, the most aperture most people can realistically point at the sky, and it shows on faint galaxies.
91/ 100
Aperture
305mm
Focal Length
1520mm
Focal Ratio
f/5
Mount Type
Dobsonian
Optical Design
Dobsonian
Weight
39.1 kg
From$1,299.95
Lowest in 90 daysLowest ever tracked
Price tracked by PolarisObserved 64 timesTracking since Mar 2026
01What it's good atWhat it's best at — and the trade-offs.
305mm of aperture gathers about 44% more light than a 10-inch, faint galaxies and globulars really respond.
01What it's good at
What it's best at — and the trade-offs.
305mm of aperture gathers about 44% more light than a 10-inch, faint galaxies and globulars really respond.
Best at
✓305mm of aperture gathers about 44% more light than a 10-inch, faint galaxies and globulars really respond.
✓Comes loaded: a dual-speed 2-inch Crayford focuser, 9x50 finder, two eyepieces, a laser collimator and a cooling fan.
✓At f/5 the views are bright and the tube stays manageable in length despite the aperture.
✓The simple, rugged Dobsonian mount puts every dollar into optics.
Trade-offs
!Large and heavy, the tube and base are a genuine two-trips, two-hands load.
!The fast f/5 mirror needs regular collimation and rewards a coma corrector at the edges.
!No tracking, so objects drift and need nudging at high power.
!A 12-inch takes real time to cool before it shows its best.
02In plain EnglishWhat These Numbers Mean
305mm · f/5 · 1520mm FL · Dobsonian
02In plain English
What These Numbers Mean
305mm · f/5 · 1520mm FL · Dobsonian
Aperture
305 mm (12 inch)
Twelve inches gathers about 1,850 times the light of your eye and roughly 44 percent more than a 10-inch. Under dark skies that difference is visible: spiral arms in the brighter galaxies, structure inside globular clusters, and planetary nebulae that show colour rather than grey.
Focal length
1520 mm
Long focal length plus large aperture gives high magnification without straining the optics, so 300x on a steady night is realistic. A 30 mm eyepiece still yields about 51x for sweeping star fields.
Focal ratio
f/5
Fast enough to keep the tube manageable and the fields wide, at the price of demanding well corrected eyepieces and careful collimation. A coma corrector is a genuine upgrade rather than a luxury here.
Optical design
Newtonian reflector
The most light per dollar available, with no false colour. Expect to collimate before serious sessions and to let the mirror cool for a while before the sharpest views arrive.
Weight
29 kg total
Around 64 lb across two pieces. The base and tube each move on their own, but this is a backyard and driveway telescope rather than a travel one, and stairs are a real consideration.
Cooldown
45 to 60 minutes
A large mirror holds indoor heat and the warm air rising off it blurs fine detail. Set the scope outside well before you plan to observe, and treat the first half hour as sky watching rather than planetary study.
03The Polaris ScoreHow it scores, and why.
91/100 · #1 of 4 12-inch Dobsonians
03The Polaris Score
How it scores, and why.
91/100 · #1 of 4 12-inch Dobsonians
91/ 100
Apertura AD12 Dobsonian 12" Telescope with Accessories
#1 of 4 12-inch Dobsonians
Performance98
Ease of use70
Portability35
Upgrade potential88
Polaris weighs optical capability, how easy the scope is to live with, how portable it is, and how far it takes you before you outgrow it — not list price or brand.
04Who it's forAn honest fit check.
Deep-sky observers who want maximum aperture per dollar.
04Who it's for
An honest fit check.
Deep-sky observers who want maximum aperture per dollar.
Buy it if you
✓Deep-sky observers who want maximum aperture per dollar.
✓Buyers who want the good accessories included, not pieced together later.
✓People with the space and a way to move a large, heavy scope.
Look elsewhere if you
!Anyone short on storage or trunk space, this is a big, two-piece instrument.
!Observers who want GoTo or tracking; this is a manual push-to Dob.
!Astrophotographers beyond snapshots of the Moon and planets.
05Build your rigWhat to buy next — and where it leads.
8 pieces of gear, ordered by what changes the view most
05Build your rig
What to buy next — and where it leads.
8 pieces of gear, ordered by what changes the view most
Recommended upgrades
See wider, brighter deep-sky views★ Top pickExplore Scientific 68deg 28mm 2-inch
Wide true field for large deep-sky objects.
$169.99View details →
Make nebulae popOptolong UHC Filter 2″
Lifts nebula contrast out of light-polluted skies.
Double your magnificationGSO 2x ED Barlow 1.25-inch
Doubles reach for planets and tight targets.
$79.95View details →
Observe better
Tame lunar glareGSO Moon Filter 13pct 1.25-inch
Improves contrast on nebulae and planets with this setup
$11.95View details →
Make nebulae popSVBony UHC 1.25-inch
Commonly paired with this telescope
$28.99View details →
Sharper planets & lunar detailCelestron X-Cel LX 7mm
Commonly paired with this telescope
$109.95View details →
A sharper everyday viewCelestron X-Cel LX 18mm
Commonly paired with this telescope
$109.95View details →
Accessories
Double your magnificationTele Vue 2x Barlow 1.25-inch
Doubles magnification for closer planetary detail with this telescope
$153View details →
06The numbersFull specifications.
6 measured and stated values
06The numbers
Full specifications.
6 measured and stated values
Optics
Optical DesignDobsonian
Aperture305mm
Focal Length1520mm
Focal Ratiof/5
Mount & drive
Mount TypeDobsonian
Physical
Weight39.1 kg
07AlternativesFor a different goal, start here.
2 alternatives, each mapped to the goal it wins at
07Alternatives
For a different goal, start here.
2 alternatives, each mapped to the goal it wins at
