What size imaging sensor can the Orion Optics AG12 fully illuminate?
The AG12 is designed with a 4-lens ED corrector that produces a corrected, flat image circle greater than 50mm in diameter. This is large enough to accommodate full-frame sensors (43mm diagonal) and even some medium-format sensors without significant vignetting or loss of star sharpness at the corners.
What kind of telescope mount is required for the AG12 OTA?
The AG12 optical tube weighs approximately 16kg and has a length of 980mm. When you add a large camera, guide scope, and other accessories, the total payload will be significantly higher. A robust equatorial mount with a payload capacity of at least 25-30kg (55-66 lbs) is recommended for stable, long-exposure astrophotography.
How does the f/3.8 focal ratio of the AG12 benefit imaging the Andromeda Galaxy (M31)?
The fast f/3.8 focal ratio allows the AG12 to collect light very rapidly. For a large, relatively bright target like the Andromeda Galaxy (M31), this means you can capture its faint outer arms and dust lanes with much shorter sub-exposures compared to a slower f/8 or f/10 system. The 1140mm focal length provides an ideal image scale for framing the entire galaxy on a full-frame sensor.
Is the AG12 a good choice for high-magnification planetary imaging of Jupiter or Saturn?
While the AG12's 300mm aperture provides high theoretical resolution, its primary design is for wide-field, deep-sky imaging. The large 110mm secondary mirror creates a significant central obstruction (approx. 37%), which reduces contrast on fine planetary details compared to a telescope with a smaller obstruction. For optimal planetary results, a Barlow lens would be required to increase the effective focal length.
What is the purpose of the three cooling fans on the AG12's mirror cell?
The three controllable fans are part of the AG12's active cooling system. They draw ambient air across the back of the 300mm primary mirror, helping it reach the outside temperature more quickly. This process minimizes internal tube currents and ensures the sharpest possible images from the very start of an observing session.
How much space does the AG12 provide for an imaging train?
The AG12 provides 79mm of distance from the focuser's connection point to the corrected focal plane. This is known as back focus and is critical for astrophotography. This generous distance allows you to easily install accessories like an off-axis guider (OAG), a filter wheel, and any necessary adapters while still being able to bring your camera to a sharp focus.
Is the AG12 available in a higher optical grade?
The AG12 ships with Orion Optics UK's Professional (1/6 PV) hand-figured optics as standard, each supplied with its own Zygo interferometer test report. For imagers who want the tightest possible star images, an Ultra (Lambda/10 PV) hand-figured optics upgrade is available, further reducing the spot sizes across the field.
