Ritchey - Chretien 300mm

Availability: Manufactured on request Type: reflector

Our Ritchey-Chrétien reflector series is engineered for uncompromising imaging performance.
Each unit integrates all essential components into a precision-crafted package featuring hand-figured optics, premium mechanical construction, and a durable, long-lasting finish.
We offer a selection of optical substrates to suit a range of performance needs and budgets:

Supremax33 Borosilicate Glass (Schott) – Fine-annealed and cost-effective, ideal for entry-level applications.
Fused Silica / Quartz (Ohara's SK-1300) – Ultra Low Expansion (ULE) material with excellent thermal stability.
Clearceram-HS (Ohara) – glass ceramic material with ultimate level of thermal stability.

For apertures of 350 mm and above, we strongly recommend Fused Silica / Quartz or Clearceram-HS, both of which deliver superior thermal behaviour and exceptional optical surface quality.

Key features:
* Hand-figured Ritchey - Chretien optics
* Precision adjustment of primary & secondary mirror
* Portable, medium size reflector telescope
* Truss type chassis design for stability and quick cool down times.
* Carbon fibre and aluminium alloy, high quality chassis/frame.

Specifications & technical data:
Clear aperture – 300 mm; Focal ratio – F/8; Focal length – 2400 mm; Central Obstruction – 50%, linear
Primary substrate – Supremax33, Fused Silica/Quartz, Clearceram HS.
Secondary substrate – Supremax33, Fused Silica/Quartz, Clearceram-HS.

Dimensions:
950 x 410 x 450 mm (L x W x H)
Weight = ~19 kg*
Usable back-focus = ~235 mm*, from back-plate
Usable back-focus = ~93.5 mm*, from corrector's last mechanical surface.
*Variations may occur with individually produced components.

Pricing :
starting from 8 900,00 Euro, net for Supremax33 version*
Price for Fused Silica/Quartz or Clearceram-HS version - to be communicated at the time of ordering, based on raw blank quotes from our glass suppliers.

Included items:
– 3.2" Starlight Instruments focuser, rack and pinion, 38mm travel (model FTF-3215)
– Field Corrector, 55mm corrected circle diameter
– shroud pack (secondary casing shroud, secondary cage shroud, truss shroud)
– side plates (pair)
– riser + finder shoe (Starlight FSB-CH)
– primary mirror cooling fans
– primary mirror heater
– primary mirror hard cover
– secondary mirror heater
– 350 mm D-type dovetail (Losmandy)
– handle.

Coatings:
standard coating reflectance: 92% (SiO overcoat), included in the price.

Optional accessories to consider when ordering:
Additional dovetail, Losmandy Type, lightweight, to replace the handle.
Controller for heaters and fans (several variants available for integration).
Electronic focusing package for FTF3215 using Starlight's HSM30 motors. Controllers can be supplied by us or user supplied.
Motorized Flat Panel Cover - please inquire.

Visual accessories:
A prism or mirror diagonal will be needed, together with good quality eyepieces, to be able to extract the most of your new telescope.

Imaging accessories:
Adapter rings are available to fit the thread dimensions of each supplied corrector.

Units available for ordering: manufactured to order.
Delivery time from order (approximative): 12 months.

* Prices subject to change without notice.
* Net prices are exclusive of any applicable duties and taxes.
These are the responsibility of the Buyer and may be charged by your local customs authority upon delivery.

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