Que peut-on photographier avec l'Askar SQA70 ?

L'Askar SQA70 est une lunette quintuplet de type Petzval avec verres ED de 70 mm d'ouverture pour 336 mm de focale (f/4,8), pensée d'abord pour l'astrophotographie du ciel profond. Sa focale vise les grandes nébuleuses comme North America, la Rosette ou le Cœur et l'Âme, la galaxie d'Andromède en entier et les Pléiades avec leurs nébulosités. À f/4,8, lumineuse, elle permet des poses raisonnables même en filtres bande étroite.

Quelle caméra lui associer ?

Avec une caméra APS-C à pixels de 3,76 µm (capteur Sony IMX571), vous obtenez environ 2,31″ par pixel pour un champ de 4° × 2,7°. Le cercle image de 44 mm couvre les capteurs plein format (24 × 36 mm) : un boîtier hybride plein format fonctionne aussi.

Faut-il ajouter un aplanisseur de champ ?

Non. Sa formule optique (quintuplet de type Petzval avec verres ED) donne d'origine un champ plat, avec des étoiles fines jusque dans les coins, sans aplanisseur externe.

Quel backfocus faut-il respecter ?

55 mm. Ce tirage se mesure du filetage jusqu'au capteur, bagues, roue à filtres et tiroir compris : le respecter au millimètre près garde des étoiles rondes dans les coins.

Quelle monture prévoir ?

Le tube pèse environ 2,7 kg ; avec la caméra, la roue à filtres et le guidage, comptez autour de 4,2 kg : une monture de la classe HEQ5-R Pro offre une bonne marge. Une lunette ne demande aucune collimation : une fois équilibrée, elle est prête dès qu'elle est à température. Avec 33,2 cm de long, elle voyage facilement en sac.

Astrographe Super Apo Askar SQA70 - Deep space astronomy

Name: Astrographe Super Apo Askar SQA70 - Deep space astronomy
Brand: ASKAR
Price: 1399.00 CHF
Availability: BackOrder

Product description

ASKAR SQA70 - the quintuplet astrograph that enhances your wide-field images

Treat yourself to the optical precision of an instrument designed made to measure for high-resolution digital imaging. Compact, lightweight and formidably efficient, the SQA70 packs all Askar's expertise into a 70 mm tube... and shakes up the standards of nomadic astrographs.

长友气体

Petzval quintuplet optics: sharpness and chromatism under control

Objective quintuplet air-spaced with 2 ED lenses faithful colors and impeccable stars.
Focal length 336 mm (f/4.8) Wide, bright field, perfect for nebulae and large stellar clouds.
Design Petzval " flat-field "integrated: focal plane perfectly flat over 44 mmwithout external corrector.

Outstanding illumination and image sharpness

≥ 90 % of illumination to the corners of a full-format sensor: minimal vignetting.
RMS radii of stars < 1.84 µm at center / < 2.4 µm in corners exceptional punctuality.

Premium mechanics designed for photographers

Lens holder 2.5" dual-speed rack (1:10) supporting heavy imaging trains.
360° rotator for precise framing without losing focus.
Lightweight one-piece collar with integrated handle/rail and double base finder for accessories.

Nomadic format, robust and versatile

Length 332 mm (lens hood retracted) for 2.68 kg only: ideal as carry-on.
Rear threads M42, M48 (2-inch filter), and M54 supplied: recommended back-focus 55 mm (adjustable 37-68 mm).
Supplied in a Oxford soft case padded and ready for the field.

Why choose the SQA70?

Extreme versatility From wide-angle celestial landscapes to mosaic imagery, she excels everywhere.
Ease of use no external correctors or complex calculations.
Optical performance fine stars, illuminated field, chromatism cancelled.
Mobility Less than 3 kg and 33 cm, perfect for nomadic or stationary use.

With the ASKAR SQA70capture the grandeur of the night sky - wide-field perfection is now in the palm of your hand.

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Frequently asked questions

What can you photograph with the Askar SQA70?

The Askar SQA70 is a Petzval-type quintuplet telescope with ED lenses, featuring a 70 mm aperture and a focal length of 336 mm (f/4.8), designed primarily for deep-sky astrophotography. Its focal length is ideal for observing large nebulae such as the North America Nebula, the Rosette Nebula, and the Heart and Soul Nebula, as well as the entire Andromeda Galaxy and the Pleiades with their nebular structures. With a fast f/4.8 aperture, it allows for reasonable exposure times even when using narrow-band filters.

Which camera should I pair it with?

With an APS-C camera featuring 3.76 µm pixels (Sony IMX571 sensor), you get approximately 2.31″ per pixel for a field of view of 4° × 2.7°. The 44 mm image circle covers full-frame sensors (24 × 36 mm): a full-frame mirrorless camera will also work.

Should we add a field leveler?

No. Its optical design (a Petzval-type quintuplet with ED glass elements) inherently produces a flat field, with sharp stars all the way to the corners, without the need for an external flattener.

What backfocus should be used?

55 mm. This focal length is measured from the thread to the sensor, including the rings, filter wheel, and filter drawer: adhering to this measurement down to the millimeter ensures that the stars remain round in the corners.

What kind of frame should I choose?

The tube weighs about 2.7 kg; with the camera, filter wheel, and guide scope, expect it to weigh around 4.2 kg: an HEQ5-R Pro-class mount provides plenty of headroom. A refractor requires no collimation: once balanced, it’s ready to use as soon as it reaches operating temperature. At 33.2 cm long, it fits easily into a bag for travel.

Technical specifications