GSO RC 305/2436 Truss Carbon OTA (RC 12")

GSO RC 305/2436 Truss Carbone

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GSO RC 305/2436 Truss Carbon OTA (RC 12")

12" RC carbon astrograph with quartz optics and precision 3" focuser. Ideal for full-frame astrophotography with premium equatorial mounts.

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Available on order. For delivery time information, please contact us.

5'099.00 CHF tax incl.

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GSO RC 305/2436 Truss Carbon OTA (RC 12")

Overview

The GSO RC 305/2436 Truss Carbon OTA is a professional-grade 12" Ritchey-Chrétien astrograph designed for observatories and high-end astrophotography. Its quartz optics with dielectric coatings offer 99% reflectivity, delivering a wide coma-free field ideal for full-frame sensors.

The carbon truss structure provides both thermal and mechanical stability, critical for long exposure sessions.


Technical specifications

  • Optical design: Ritchey-Chrétien (hyperbolic mirrors)

  • Aperture: 305 mm

  • Focal length: 2436 mm

  • F-ratio: f/8

  • Primary mirror: quartz, dielectric coating 99%

  • Secondary mirror: quartz, ~120 mm

  • Central obstruction: ~42%

  • Backfocus: ~250 mm from rear flange

  • Structure: carbon truss, CNC aluminum end rings

  • Tube weight: ~24 kg

  • Focuser: 3" Monorail with 1:10 fine focus, 2" and 1.25" adapters

  • Included:

    • Extension rings

    • Losmandy rails

    • Dust covers


Optical performance

  • Fully corrected field for sensors up to 60 mm

  • Free of coma and spherical aberration

  • Suitable for:

    • Planetary nebulae and galaxies

    • Long focal length deep sky imaging

    • Scientific photometry or spectroscopy


Mount compatibility

Due to its size and mass, this OTA requires a stable mount:

iOptron mounts:

  • CEM70 / CEM70G – light-duty option (limit use)

  • CEM120 / EC / EC2 – ideal observatory solution

10Micron mounts:

  • GM2000 HPS II Combi – high precision, perfect for imaging

  • GM3000 HPS – suitable for heavier setups or dual OTAs


Highlights

  • Ritchey-Chrétien optics with flat coma-free field

  • Carbon truss design for maximum rigidity and thermal stability

  • Large 3" focuser supports heavy image trains

  • Built for full-frame sensors and advanced imaging workflows

  • Ideal for serious amateurs and professional observatories

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