What makes the SharpStar 130HNT's f/2.8 speed so important for astrophotography?

An f/2.8 focal ratio dramatically reduces the exposure time needed to capture faint deep-sky objects. Compared to a more common f/5.6 instrument, it gathers light four times faster. This means you can capture more data in a single night, improve your signal-to-noise ratio, and place less demand on your tracking mount.

How does the SharpStar 130HNT's 44mm image circle perform on large targets like the Andromeda Galaxy (M31)?

The 44mm image circle is designed for full-frame sensors. Combined with the 364mm focal length, this provides a massive 6.9-degree field of view. This is wide enough to capture the entire Andromeda Galaxy (M31) and its satellite galaxies, M32 and M110, with plenty of surrounding space, making it ideal for large-scale mosaics and framing the biggest nebulae.

Do I need to collimate the SharpStar 130HNT, and is it difficult?

Yes, as a Newtonian reflector, the SharpStar 130HNT requires collimation to ensure the mirrors are perfectly aligned for sharp images. The primary mirror features three sets of user-friendly adjustment screws. While it requires a laser collimator or cheshire eyepiece, the process is straightforward and essential for achieving the telescope's specified 0.89 arc second resolution.

Can the 3kg focuser capacity of the SharpStar 130HNT handle a full-frame camera, filter wheel, and off-axis guider?

Absolutely. The 3kg payload capacity of the dual-speed rack-and-pinion focuser is specifically designed for modern imaging setups. A typical full-frame cooled CMOS camera, 7-position filter wheel, and an off-axis guider will fall well within this limit, preventing focuser sag or tilt during long exposures.

What is the standard 55mm back focus on the SharpStar 130HNT, and why does it matter?

The 55mm back focus is the standardized distance required between the focuser's M48 thread and your camera's sensor for the optical corrector to work properly. This standard is used by most DSLRs (with a T-ring) and dedicated astronomy cameras, making it easy to achieve the correct spacing without complex calculations or custom adapters.

What are the benefits of the PZ33 primary mirror in the SharpStar 130HNT?

PZ33 is a borosilicate glass similar to Pyrex, with a very low coefficient of thermal expansion. This means as the temperature drops overnight, the mirror's shape remains stable, preventing the focus from shifting. This is a critical feature for maintaining sharp stars over a long imaging session.

SharpStar Astrographe newtonien hyperbolique 130mm f/2.8 HNT

par SharpStar Optics

UGC SSO-13028HNT-AL

CA$2,303.00 - CA$2,303.00

CA$2,303.00

CA$2,303.00 - CA$2,303.00

CA$2,303.00

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Le 13028HNT-AL est un réflecteur newtonien hyperbolique avec une ouverture de 130 mm et un rapport focal rapide F2.8.

Le 13028HNT-AL prend en charge un cercle d'image plein format de 44 mm et les performances des étoiles sont excellentes.

Le miroir primaire est en verre PZ33, similaire au Pyrex. Son coefficient de dilatation thermique est inférieur à celui du verre ordinaire. Le revêtement diélectrique multicouche confère au miroir primaire un pouvoir réfléchissant élevé, atteignant 97 %. Le petit axe du miroir secondaire mesure 65 mm, ce qui permet un éclairage suffisant pour une imagerie plein format.

Le correcteur du focaliseur adopte une conception de lentille double, dont l'une est un verre ED, améliorant la puissance de correction des aberrations.

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SharpStar Astrographe newtonien hyperbolique 130mm f/2.8 HNT

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