Askar

Askar 151PHQ Quadruplet Astrograph

The largest of Askar's PHQ line, a 151mm f/7 flat-field quadruplet reaching over 1000mm of focal length, a big-aperture galaxy-scale imaging refractor at a fraction of premium-brand pricing.

90/ 100

Polaris Score

#1 of 4 large imaging astrograph

See the breakdown ↓

Aperture

151mm

Focal Length

1057mm

Focal Ratio

f/7

Mount Type

None (OTA only)

Optical Design

Quadruplet Astrograph

Weight

11 kg

From$4,499

Lowest in 90 days

Price tracked by PolarisObserved 28 timesTracking since Mar 2026

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Where to buy

Agena AstroProductsPartnerBest price$4,499→High Point Scientific$4,499→Starizona$4,499→

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What it's built forOpen these in the simulator →

This telescope was built for the camera.

A fast f/7 astrograph designed to throw a wide, flat, well-corrected field onto a sensor. It is an optical tube first — give it a tracking mount and a camera and it rewards long exposures, not eyepieces.

f/7 — built to imageNeeds a tracking mount

The view people remember

Andromeda, wider than the Moon.

A vast soft oval with a blazing core — two and a half million light-years of galaxy, spilling well past the field of view under a genuinely dark sky.

See Andromeda Galaxy through this telescope →

Where else it shines

Within reach

Orion Nebula

Colorful nebula captured with live stacking — wings and filaments

Open view →

Rewards a dark sky

Whirlpool Galaxy

Long-exposure capture revealing galaxy core and outer structure

Open view →

Easy first target

The Pleiades

Field rich with stars — long exposure pulls in fainter members

Open view →

Also excellent on

Saturn

Processed planetary capture with rings or bands clearly visible

Open view →

✦

There is no eyepiece experience here. Its reward shows up on a sensor, after the exposure — not in the moment.

01What it's good at

What it's best at — and the trade-offs.

Best at

✓The four-element flat-field design delivers pinpoint stars across a full-frame sensor with no separate flattener

✓1057mm at f/7 reaches galaxies and smaller nebulae that shorter astrographs cannot resolve in detail

✓151mm of aperture gathers the light to keep exposures reasonable at this long focal length

✓A heavy-duty focuser holds large cameras square through long exposures

Trade-offs

!At 11kg it demands a heavy, accurate equatorial mount

!1057mm is unforgiving of guiding and polar-alignment errors

!As an OTA it needs a mount, camera and guiding to work

!The long focal length narrows the field, so large targets will not fit

02In plain English

What These Numbers Mean

Aperture

151 mm

Six inches of refractor aperture feeding a camera. This is the point where narrowband imaging of faint supernova remnants and small galaxy groups becomes practical from a suburban backyard rather than a project reserved for dark sites.

Focal length

1057 mm

A metre of focal length paired with six inches of aperture gives both scale and signal. Expect to work on galaxies, planetary nebulae and tight clusters rather than sweeping wide fields.

Focal ratio

f/7

Mid-speed for an astrograph. It is slower than the wide-field quintuplets, but the extra aperture more than compensates: the system collects far more total light per exposure than a small fast scope at the same ratio.

Optical design

Quadruplet flat-field astrograph

The flattener is built into the four-element design, so full-frame corners stay clean with no spacing to calculate. Fewer separate parts in the optical path means fewer chances for tilt and reflections.

Weight

11 kg tube

Around 24 lb before rings and camera, and a long tube with it. This is a permanent-pier or dedicated-rig telescope more than a load-in-the-car one.

Mount

OTA only

No mount included. With a loaded weight near 15 kg at 1057 mm, a heavy equatorial with good periodic error and reliable guiding is the minimum for round stars.

02The Polaris Score

How it scores, and why.

90/ 100

Askar 151PHQ Quadruplet Astrograph

#1 of 4 large imaging astrograph

Performance

Ease of use

Portability

Upgrade potential

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.

03Who it's for