Ritchey-Chrétien 400mm F/8


Clear aperture – 400 mm;
Focal length – 3200 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.


1098 (L) x 525 (l) x 525 (h) mm (might differ slightly, depending on extra items chosen);
Weight – 37 kg;
Back-focus from back plate ~ 240 mm;
Connection thread on the back plate adapter: M120x1 – female.

Included in the price of the OTA:

*D-type (Losmandy) dovetail, 450 to 500 mm long;
*upper handle or second dovetail (can be either D-type or V-type; Customer’s choice), 300 to 350 mm long;
*side plates for increased stiffness;
*back plate handles;
*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;


14 760 Euro, includes VAT 23%. Net export price – 12 000 Euro (non EU countries) – Supremax33 primary

17 835 Euro, includes VAT 23%. Net export price – 14 500 Euro (non EU countries) – Quartz/ClearceramHS primary – special order

  • prices of OTAs are subject to change without notice

Optional items:

*flight case – please inquire; Too big and too heavy for one person, we recommend it only if a ‘must have’.
*soft case – not available
*focuser – various choices; please inquire for pricing.
We recommend FTF3215 as it can receive without any adaptation, using its draw tube M86 female thread, our Field Corrector.


Number of units manufactured/ordered: 1
Units available for ordering: none, manufactured based on order
Average lead time: please inquire.

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