GSO 8" f/8 Ritchey-Chr tien - 203/1624mm RC - Carbon tube
Ritchey-Chr tien (RC) telescopes are known for their excellent optical performance, especially for photographical applications. At the same time however RCs were always notorious for being very expensive. GSO is best known for their excellent Newtonian optics which they have built for many years now.
The result of this joint venture is an instrument that is superior in most aspects to a conventional Schmidt-Cassegrain, and still comes at a very affordable price.
The 8" f/8Astrograph was designed for full illumination of the "35mm format" (24 x 36mm). For cameras with a small sensor, particularly most CCD cameras, no field flattener is needed. For cameras with a larger sensor we recommend the use of a field flattening lens. (Currently under development.)
Since the optical layout of the RC uses no lenses or corrector plates there is no false colour at all. Also you will not need to use an IR cut filter, thus increasing the effective light-gathering power of the instrument.
How to bring a SLR camera into focus:
The GSO RC has a generous back focus allowing to attach many accessories like e.g. off-axis-guiders, filter wheels etc. If you want to take photos with a (D)SLR camera with the focuser in a moderate position, you need the following accessories:
50mm spacer, to be placed between focuser and telescope
T2 adapter with 40mm extension
Scope of Delivery:
- 8" f/8 RC Astrograph
- 2" Focuser with reduction adapter from 2" to 1.25"
- 2x Dovetails - 1x Losmandy / 1x GP style
- M90 extension tubes for easy reaching of the focus
- Weigth: 6.2 kg
- Obstruction: 85 mm
- Tube length: 580 mm incl. focuser
- Tube diameter: 230 mm
- Prism rail length: 395 mm
- Necessary extension tube for 2" diagonal mirror: 50 mm and 80mm for 1,25" diagonal mirror.