En tant que débutant avancé passant d'un télescope Celestron Astromaster 70AZ à un télescope Dobson, je cherche un instrument robuste adapté à l'observation d'objets du ciel profond et de planètes sur le moyen et long terme. Mon choix se porte entre deux modèles : le Bresser Messier 6" Dob (150/1200), disponible à 170 € grâce à des bons de réduction du magasin, et le GSO Deluxe 8" Dob (200/1200), au prix de 500 €.
Bien que j'aie initialement prévu d'acheter le GSO 8", la remise importante sur le Bresser 6" représente une alternative attrayante, bien que le bon de réduction ne s'applique qu'au modèle Bresser. Étant donné que j'observe depuis un lieu classé Bortle 6, je dois peser si les performances et les avantages mécaniques du plus grand GSO 8" justifient l'investissement supplémentaire.
Thank you for the advice. I’ll likely choose the GSO 8″ since it seems like a good long-term option. Currently, I can get it for around 500€ or $580.
The Bresser Messier 6″ Dob (150/1200) features a parabolic mirror, not a spherical one.
It’s a shame you can’t transfer the much larger and better altitude bearings from the 6″ scope to the 8″ model.
The GSO 8-inch also features a higher-quality dual-speed focuser.
Thank you for sharing this.
I decided to go with the GSO 8″. Thanks for the help, everyone.
Both are solid choices.
The GSO 8″ Deluxe is a much better telescope and overall package. For around €500, you get excellent value. As others have noted, the GSO features a parabolic mirror, unlike the 6″ model which uses a spherical mirror. Having used both, I can confirm that spherical mirrors don’t come close to the quality of GSO’s parabolic optics. If you’re looking to observe planets and deep-sky objects, the GSO will meet and exceed your expectations.
Thank you for the recommendation.
I also confirmed this information in the telescope’s instruction manual.
The Bresser Messier Planetary 6″ uses a spherical mirror. While its F8 ratio likely minimizes issues, the GSO Deluxe should offer sharper and brighter views due to its parabolic mirror.
I can’t definitively say how a 150/1200 spherical mirror performs, but I’m satisfied with my 114/900 spherical scope—though I haven’t compared it to a parabolic model. It’s worth noting that Bresser uses parabolic mirrors in their 150/750 and 200/1200 models, and they typically advertise this feature when applicable, which they don’t for the 6″ Planetary.
The price difference reflects these distinctions. Still, the Bresser represents good value, as it’s more affordable than building a comparable scope yourself, and most users will likely be pleased with it.
The Bresser 6″ (150/200) features a parabolic mirror, as confirmed by its instruction manual.
Based on an old manual from October 2020, I believe the website would have highlighted if it had a true parabolic mirror. However, I’m uncertain how significant the difference is at F8.
The mirror quality may have been better a few years ago, but now it’s being marketed as “new” with a solar filter.
Note that the 8″, 10″, and 12″ models do come with parabolic mirrors.
That said, the Messier 6″ for $200 still seems like a very good deal. I’m not trying to discourage you from it—I would have purchased it myself.
Thank you for the advice.