Classic Cassegrain 300 mm

Availability: manufactured on request; Type: reflector

Our line of Cassegrain reflectors is directed towards visual astronomy (it excels at planetary, moon, globular clusters, nebulae observation) as well as planetary imaging.
It offers great light gathering abilities; its high quality mirrors being placed in a beautifully executed chassis which makes collimation very easy.
Contrary to popular beliefs, Cassegrain optics if designed and executed properly can deliver pinpoint stars (no coma) in both 1.25″ and 2″ eyepieces.
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:
* 2" rack and pinion type focuser from Starlight Instruments, 50mm travel
* precision adjustment of primary & secondary mirror
* portable, medium size reflector telescope
* truss type chassis design for quick cool down
* carbon fiber and aluminium alloy high quality construction.

Specifications & technical data:
Clear aperture – 300 mm; Focal ratio – F/15; Focal length – 4500 mm; Central Obstruction – 31%
Clear aperture – 300 mm; Focal ratio – F/20; Focal length – 6000 mm; Central Obstruction – 25%
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:
F/15 version – 1060 x 410 x 450 mm (L x W x H)
F/20 version – 1030 x 410 x 450 mm (L x W x H)
Weight – ~19 - 19.5 kg, with solid mirror, 35mm thick
Usable back-focus – ~190 mm

Pricing (last updated in 09.2022):
8 389,00 Euro, including VAT 23%. Net export price – 6 820,00 Euro (non-EU countries) – Supremax33 version*
11 267,00 Euro, including VAT 23%. Net export price – 9 160,00 Euro (non-EU countries) – Fused Silica/Quartz or Clearceram/Zerodur version
* Limited number of orders accepted - see link on homepage *

* 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:
– 2" Starlight Instruments focuser, rack-and-pinion, 50mm travel
– 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
– 500 mm D-type dovetail (Losmandy)
– handle.

Coatings:
standard coating reflectance: 92% (SiO overcoat), included in the price.
optional enhanced coating reflectance: 96% (TiO overcoat) = +344,00 Euro, including 23% VAT; net price = 280,00 Euro.

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 = 200,00 Euro, including VAT 23%; Net price = 163,00 Euro
Dual controller for primary's heater and fans (manual control) = 185,00 Euro, including VAT 23%; Net price = 150,00 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 box, Focuser Boss kit 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.

Number of units manufactured/ordered: 12
Number of F/15 units manufactured/ordered: 2
Number of F/17 units manufactured/ordered: 1
Number of F/20 units manufactured/ordered: 9
Units available for ordering: manufactured to order.
Delivery time from order (approximative): 12 months.

* Prices subject to change without notice.

Back to products list