What does the "Quintuplet Petzval" design of the Askar SQA70 mean for imaging?
The quintuplet (5-element) Petzval design is a self-flattening optical system. This means the Askar SQA70 corrects for field curvature internally, delivering sharp stars across its entire 44mm image circle without requiring a separate field flattener accessory. You can attach your camera directly and achieve a flat field.
Can the Askar SQA70 be used with a full-frame camera?
Yes. The Askar SQA70 produces a 44mm image circle, which is large enough to fully illuminate the sensors of full-frame cameras (e.g., Sony a7 series, Canon R series, ZWO ASI6200MM/MC) without vignetting.
What kind of deep-sky objects are a good match for the Askar SQA70's 336mm focal length?
The 336mm focal length is ideal for large deep-sky objects and regions of the Milky Way. Excellent targets for the Askar SQA70 include:
- The Andromeda Galaxy (M31)
- The North America Nebula (NGC 7000)
- The Rho Ophiuchi Cloud Complex
- The Orion Nebula (M42) and its surrounding molecular cloud
How does the f/4.8 focal ratio of the Askar SQA70 benefit astrophotography?
The fast f/4.8 focal ratio allows the telescope to collect light very quickly. This means you can use shorter individual exposure times to capture faint details in nebulae and galaxies, which reduces the strain on your mount's tracking accuracy and allows you to gather more data in a single imaging session.
Is the Askar SQA70 suitable for portable, wide-field astrophotography setups?
Absolutely. With its 70mm aperture and 336mm focal length, the Askar SQA70 is compact and lightweight, making it an excellent choice for portable setups on trackers like the Sky-Watcher Star Adventurer or iOptron SkyGuider Pro, as well as on medium-payload equatorial mounts.
What is the purpose of the two ED glass elements in the Askar SQA70?
The two ED (Extra-low Dispersion) glass elements are used to minimize chromatic aberration, also known as color fringing. This ensures that stars are sharp, point-like, and free of distracting purple or blue halos, resulting in higher-contrast and more natural-looking images.
