Ritchey-Chrétien 250mm F/8

Characteristics:

Clear aperture – 250 mm;
Focal length – 2000 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.

Dimensions:

700 (L) x 330 (l) x 330 (h) mm (might differ slightly, depending on extra items chosen);
Weight – 12.5 kg;
Back-focus from back plate ~ 220 mm;
Connection thread on the back plate adapter: M117x1 – male.

Included in the price of the OTA :
*D-type (Losmandy) dovetail, 300 mm long;
*upper handle or second dovetail (can be either D-type or V-type; Customer’s choice), 180 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 – 6290 Euro, including VAT; Net price – 5114 Euro.
Quartz/Clearceram-HS/Zerodur – 7490 Euro, including VAT; Net price – 6089 Euro.

Optional items :
*flight case – 500 Euro, including VAT; Net price – 406 Euro.
*soft case – 195 Euro, including VAT; Net price – 159 Euro.
*focuser – various choices; please inquire for pricing.
We recommend FTF3215 as it can accept directly our Field Corrector.

 

Contact Us

We're not around right now. But you can send us an email and we'll get back to you, asap.

Not readable? Change text.

Start typing and press Enter to search