Ritchey - Chretien 400mm

Availability: manufactured on request; Type: reflector

Our line of Ritchey-Chretien reflectors is designed to offer non-compromising imaging quality, by integrating everything needed in a package containing high-quality hand-figured optics, top-quality finish & mechanics.
We’re delivering the full range of substrates for these telescopes, starting with basic borosilicate glass (Supremax33), moving upwards in value/quality by using Ultra Low Expansion glass like Fused Silica/Quartz, which we highly recommend as first choice for telescopes with 350mm and above diameters, while for those of you who desire best optical quality finish coupled with the lowest mass, we might be able soon to deliver also cellular blanks. 
The latter has the advantage of quickest cool down coupled with reduced weight (sensible weight differences/gains are observable in bigger sizes, 350 & 400mm).

Main features:
* hand-figured Ritchey - Chretien optics
* precision adjustment of primary & secondary mirror
* portable, medium size reflector telescope
* truss type chassis design for quick cool down
* carbon fibre and aluminium alloy high quality construction.

Specifications & technical data:
Clear aperture – 400 mm; Focal ratio – F/8; Focal length – 3200 mm; Central Obstruction – 50%, linear
Primary substrate – Supremax33, Fused Silica/Quartz or Cellular
Secondary substrate – Fused Silica/Quartz
Primary mirror cage material – Carbon Fiber
Truss tubes material – Carbon Fiber.

Dimensions:
1150 x 525 x 560 mm (L x W x H; considers handle, dovetail & focuser added height/length)
Weight : ~35 kg
Usable back-focus : ~275 mm, from back-plate
Usable back-focus :  88.8 mm, from corrector.

Pricing (last updated in 2019):
16 000,00 Euro, including VAT 23%. Net export price – 13 008,00 Euro (non-EU countries) Supremax33 version*
18 450,00 Euro, including VAT 23%. Net export price – 15 000,00 Euro (non-EU countries) Fused Silica/Quartz or Clearceram/Zerodur version 
* above prices to be modified. No additional orders accepted. *

* for sizes above 300mm, we recommend Supremax33 substrate be used in climates where there is small or no temperature variance during observing sessions. 
This shall allow the telescope to be used at its full potential.

Included items:
– 3.5" Starlight Instruments focuser, rack and pinion, 38mm travel
– Electronic focusing package for secondary mirror or Electronic focuser control for FTF3515 (motor with integrated controller, from Optec)
– Field Corrector, 60mm 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
– 500 mm D-type dovetail (Losmandy)
– handle
– back-plate handles pair

– Dual controller for primary's heater and fans (manual control).

Coatings:
standard coating reflectance: 92% (SiO overcoat), included in the price.
optional enhanced coating reflectance: 96% (TiO overcoat) = + 431,00 €, including 23% VAT; net price = 350,00 €.

Optional accessories to consider when ordering:
Dovetail, D-type (Losmandy), 500 mm length, lightweight = 180,00 Euro, including VAT 23%; Net price = 146,00 Euro
Padded case = 350,00 Euro, including VAT 23%; Net price = 285,00 Euro

Electronic focusing package for secondary mirror (Armadillo Seletek controller, Hybrid Linear motor) = 890,00 Euro, including VAT 23%; Net price = 724,00 Euro
Electronic focuser control (motor with integrated controller, from Optec) = 660,00 Euro, including VAT 23%; Net price = 537,00 Euro
Electronic focuser control (motor + controller, from Starlight instruments) = 890,00 Euro, including VAT 23%; Net price = 724,00 Euro.


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:
We can manufacture adapters and extensions to suit one's observing and/or imaging needs.

Number of units manufactured/ordered: 3
Units available for ordering: manufactured to order.
Delivery time from order (approximative): 12 - 15 months.

Prices subject to change without notice.

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