Que peut-on photographier avec l'Askar SQA70 Pro ?

L'Askar SQA70 Pro est un astrographe sextuplet Petzval de 70 mm d'ouverture pour 322 mm de focale (f/4,6), conçu pour l'astrophotographie du ciel profond. Sa focale courte vise les grandes nébuleuses (North America, Rosette, Cœur et Âme), la galaxie d'Andromède en entier et les Pléiades. À f/4,6, elle reste lumineuse pour des poses raisonnables, y compris en filtres à bande étroite.

Quelle caméra lui associer ?

Avec une caméra APS-C à pixels de 3,76 µm (capteur Sony IMX571), l'échelle est d'environ 2,41″ par pixel. 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 sextuplet Petzval (verre SD et verre ED) donne d'origine un champ plat jusqu'au plein format, sans aplanisseur externe.

Quel backfocus faut-il respecter ?

Askar indique qu'avec le design Petzval aucun calcul complexe de backfocus n'est requis. La longueur de connexion recommandée est de 55 mm (plage supportée 36–68 mm), mesurée du filetage jusqu'au capteur, bagues et accessoires compris.

Quelle monture prévoir ?

Le tube OTA pèse 3 kg ; avec collier et queue d'aronde, 3,8 kg. Avec caméra, roue à filtres et guidage, comptez autour de 5 kg : une monture de la classe HEQ5-R Pro offre une bonne marge. Longueur 331 mm : format adapté au voyage.

Astrographe Super Apo Askar SQA70 Pro

Name: Astrographe Super Apo Askar SQA70 Pro - Deep space astronomy
Brand: ASKAR
SKU: ASKAR-SQA70PRO
Price: 1765.00 CHF
Availability: BackOrder

Product description

ASKAR SQA70 Pro – the next-generation Petzval sextuplet astrograph

A direct evolution of the SQA70, Askar’s SQA70 Pro retains the compact 70-mm format and features an upgraded optical system six-element air-spaced Petzval lens with an SD card (2^e element) and an ED glass (4^e element). Goal: more uniform stars and enhanced chromatic correction across a full-frame field of view.

Petzval sextuplet lens, with integrated flat field

Aperture 70 mm, focal length 322 mm, report f/4.6.
Formula Petzval sextuplet with air gaps: built-in flattener, no external proofreader to be added.
Image circle 44 mm (full size).
According to Askar, the Petzval design eliminates the need for complex backfocus calculations; recommended connection length 55 mm (range 36–68 mm).

Mechanics Designed for Imaging

Fixed sunshade to minimize stray light and protect the tube.
Rear Adapters M42, M48, and M54 ; the M48 features a 2″ filter thread.
Total length 331 mm ; OTA mass 3 kg (3.8 kg with collar and dovetail).
Comes with a Oxford soft case.

Why the SQA70 Pro?

Faster than the SQA70 (f/4.6 vs. f/4.8) for an even slightly wider field of view.
Optique Pro : SD + ED sextuplet for more consistent stars.
Full-size, ready to go : Built-in Petzval lens; M42/M48/M54 adapters included.
Portable format : 33.1 cm and 3 kg, suitable for both mobile and desktop use.

Manufacturer sources: Askar SQA70 Pro – Sharpstar Optics.

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Frequently asked questions

What can you photograph with the Askar SQA70 Pro?

The Askar SQA70 Pro is a 70-mm-aperture Petzval sextuplet astrograph with a focal length of 322 mm (f/4.6), designed for deep-sky astrophotography. Its short focal length is ideal for imaging large nebulae (North America, Rosette, Heart and Soul), the entire Andromeda Galaxy, and the Pleiades. At f/4.6, it remains bright enough for reasonable exposure times, even when using narrowband filters.

Which camera should I pair it with?

With an APS-C camera featuring 3.76 µm pixels (Sony IMX571 sensor), the scale is approximately 2.41″ per pixel. 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 sextuplet Petzval design (SD glass and ED glass) inherently produces a flat field all the way to full frame, without an external field flattener.

What backfocus should be used?

Askar notes that the Petzval design does not require any complex backfocus calculations. The recommended connection length is 55 mm (supported range: 36–68 mm), measured from the thread to the sensor, including rings and accessories.

What kind of frame should I choose?

The OTA tube weighs 3 kg; with the collar and dovetail, it weighs 3.8 kg. With the camera, filter wheel, and guider, expect it to weigh around 5 kg: an HEQ5-R Pro-class mount provides plenty of headroom. Length: 331 mm—a travel-friendly size.

Technical specifications