Why choose a Ritchey-Chretien like the Photron 12" for astrophotography?
The Ritchey-Chretien design is a dedicated astrograph, meaning it's optimized for photography. It uses two hyperbolic mirrors to eliminate an optical aberration called coma, resulting in sharp, pinpoint stars across the entire imaging field without needing an extra corrector lens. This makes the iOptron Photron 12" RC ideal for capturing wide, clean fields of view.
What kind of mount is needed for the 53 lb iOptron Photron 12" RC?
With an optical tube weight of 53 lbs, plus the weight of your camera and guide scope, you will need a heavy-duty equatorial mount with a payload capacity of at least 70-80 lbs for stable imaging. Mounts in the Losmandy G11, iOptron CEM70/CEM120, or Celestron CGX-L class are appropriate.
How does the carbon truss tube on the Photron 12" help with imaging?
Carbon fiber has a very low thermal expansion rate. This means that as the temperature changes overnight, the 2432mm focal length of the telescope remains stable. This prevents your focus from shifting, which is a common problem with metal-tube telescopes and can ruin long exposures.
What are the included extension tubes with the Photron 12" RC for?
The Photron 12" comes with two 1" and one 2" extension tubes for the focuser. These are used to adjust the spacing between the focuser and your camera to achieve proper focus. Different cameras, filter wheels, and other accessories require different amounts of back focus, and these rings provide the flexibility to accommodate most imaging setups.
How will the Photron 12" RC perform on a small galaxy like the Whirlpool Galaxy (M51)?
The 2432mm focal length of the Photron 12" is ideal for targets like the Whirlpool Galaxy (M51). This long focal length provides high magnification, allowing you to frame the galaxy and its companion, NGC 5195, perfectly while resolving fine detail like spiral arms and dust lanes. The 12" aperture gathers enough light to capture faint structures in a reasonable amount of exposure time.
Will I need a field flattener with the iOptron Photron 12" RC on a large sensor?
While the Ritchey-Chretien design is inherently free from coma, it does have some natural field curvature, especially noticeable on full-frame or larger sensors. For the most demanding applications and perfectly flat fields edge-to-edge, a dedicated field flattener or reducer/flattener is recommended. For sensors of APS-C size or smaller, the native field is often flat enough not to require one.
