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AG Optical Systems

AG Optical Systems

AG Optical Systems builds astrographs for people whose limiting factor is no longer the telescope. Carbon fibre truss structures that hold collimation through temperature swings, corrected Dall-Kirkham and Harmer-Wynne designs that deliver flat, coma-free fields across large sensors, and mechanical quality intended for permanent observatory installation. David Astro carries AG Optical Systems products in Canada, in stock, with fast shipping across Canada and worldwide.

These are serious instruments and a serious specification exercise, involving mount, sensor size, focuser and site. We are happy to work through it with you before anything is ordered.

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Astrograph Designs for Large Sensors

Every design here exists to produce a flat, well-corrected field at a long focal length, which is where most conventional telescopes fall short with a big chip.

  • Corrected Dall-Kirkham designs: An ellipsoidal primary with a spherical secondary plus a corrector group, giving a flat field and easier collimation than a classical Ritchey-Chretien.
  • Harmer-Wynne designs: A corrector arrangement producing an exceptionally flat, well-corrected field across very large sensor formats.
  • Carbon fibre truss structures: Very low thermal expansion, so focus and collimation hold as the temperature drops through a Canadian night.
  • Fully illuminated field size: The specification that matters most with a large sensor, and one that varies considerably between designs at the same aperture.
  • Focuser and rotator provision: Designed to carry heavy instrument packages squarely, which is not a given on telescopes of this focal length.
  • Mount requirements: Long focal length demands a mount with guiding accuracy well beyond what a portable setup provides.

Why Choose David Astro for AG Optical Systems

At this level, the telescope is rarely the thing that limits the result. The mount, the site and the guiding usually are.

  • Whole-system honesty: We will tell you if your mount or your typical seeing will not let a given aperture and focal length perform, before you buy the telescope.
  • Illuminated field matched to sensor: We check the design's fully corrected field against your intended sensor, since that determines the real usable image.
  • Installation planning: Pier, clearance and cabling planned alongside the optic, because these are difficult to change once installed.
  • Authorized dealer: Full manufacturer warranty with support handled domestically in Canada.
  • Ships from Canada: No duties or brokerage fees for Canadian buyers on high-value optics.

AG Optical Systems in Canada — Frequently Asked Questions

What is a corrected Dall-Kirkham?
A Cassegrain variant using an ellipsoidal primary and spherical secondary with a corrector group. It is considerably easier to collimate than a Ritchey-Chretien and delivers a flat field across large sensors.
Why carbon fibre?
Very low thermal expansion. A metal truss changes length measurably as temperature drops, shifting focus through the night. Carbon holds focus and collimation far better across a Canadian temperature swing.
What mount do I need?
One with guiding accuracy suited to the focal length, which generally means an observatory-class equatorial with encoders or excellent periodic error. The mount is usually the constraint, not the optic.
Is my seeing good enough?
At long focal length, seeing frequently limits resolution below what the optics deliver. We will discuss realistic expectations for your site before recommending an aperture and focal length.

Specifying an astrograph?

Tell us your mount, sensor and site and we will work through the whole system. Canadian stock and support.