Ritchey-Chrétien 300mm F/8


Clear aperture – 300 mm;
Focal length – 2400 mm;
Primary substrate – fine annealed Supremax33; Quartz/Clearceram-HS/Zerodur (special order);
Secondary substrate – Quartz or fine annealed Supremax33;
OTA type – Serrurier Truss;
Aluminium alloy used – Type 70xx for plates; Type 60xx for anodized elements
Primary mirror cage – Carbon Fiber;
Truss tubes – Carbon Fiber.


830 (L) x 400 (l) x 400 (h) mm (might differ slightly, depending on extra items chosen);
Weight – 18 kg;
Back-focus from end of back plate ~ 230 mm;
Connection thread on the back plate adapter: M117x1 – male.

Included in the price of the OTA :
*D-type (Losmandy) dovetail, 400 mm long;
*upper handle or second dovetail (can be either D-type or V-type; Customer’s choice), 250 mm long;
*side plates for increased stiffness;
*finder bracket + riser;
*precision adjustment knob for secondary mirror with 0.5-mm or 1-mm travel per full turn, Customer’s choice;
*precision tilt knobs for primary mirror with 1-mm travel per full turn;
*primary mirror fans (RCA connector);
*primary mirror dew heater (RCA connector);
*secondary mirror dew heater (RCA connector);
*Lycra truss covers, set of 3 (three). Front, secondary case and truss cover;
*aluminium cover for primary’s cage;
*Field Corrector, corrected field is ~52 mm;

Pricing :
Supremax33 version – 7400 Euro, including VAT; Net price – 6016 Euro.
Quartz/Clearceram-HS/Zerodur – 9400 Euro, including VAT; Net price – 7642 Euro.

Optional items :
*flight case – 600 Euro, including VAT; Net price – 488 Euro.
*soft case – 220 Euro, including VAT; Net price – 179 Euro.
*focuser – various choices; please inquire for pricing.
We recommend FTF3215 as it can accept directly our Field Corrector.

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