0 Items
Basket SubTotal: £0.00 Checkout
RC 250mm f/6
£7,249.00 inc. tax

£6,040.83 ex. tax
? Tax based on United Kingdom.

Description

Ritchey-Chretien telescopes are popular for astrophotography and professional observatories due to their relatively large corrected field and absence of coma.

The tube assembly is semi-ruggedised and is of fail-safe construction.

The mirror supports in instruments under 600 mm are high precision floatation cells with full edge supports, larger mirrors are supported with kinematic face and edge supports.


The focuser is included as standard, this is achieved by moving the secondary mirror.

This model is available up to 1M Aperture. Please enquire for details.


Specification 


Aperture (mm) 250
Recommended mount type GEM
Tube tube Closed
Focal length (mm) 1500
Tube length (operating) 625
OTA Weight (kg) 12
Back focus 175
Focal ratio F/ 6
Cooling fans Primary mirror
Airflow Rear
Mirror coatings Enhanced Aluminium + SiO2 protective layer
Focuser Integrated JTW Rhino
Clear aperture (mm) 50
Tube construction Carbon fiber
Optical surface quality (Strehl, PTV) 0.97, 1/10
Primary mirror substrate Schott Supremax 33
Primary mirror cell 9 point floatation cell
Primary baffle Solid with micro-baffling
Secondary mirror substrate Schott Supremax 33
Secondary mirror cell 3 point floatation cell
Secondary baffle Solid with micro-baffling
Bolting A4 Stainless steel
Metal protection Dual
Surface treatment Aluminium – 20 micron hard-coat anodising
Paint Exterior grade powdercoat (environmentally friendly)
Anti dew system Optional

Quantity:

Add to Cart
Product Code
- RC-f6-250mm
Product Condition
- New
Brand
- JTW OTA

Details

Product Images

Reviews

Related Products

Product Details

No Reviews Posted Yet - be the first!

write review

Featured Products

StarGPS Celestron NexStar GOTO Mounts
£149.00
QHY5-III 224 C
£320.00
EQ6 Rail Kit
£129.00
Hypertune HEQ5 Mount
£249.00
StellarDrive™ EQ8
£999.00
Astro Imaging Classes Part 1 & Part 2 - 2016/17
£35.00
AstroTrac Adapter for PoleMaster
£32.00
QHY5P-II Colour Camera
£159.00
Astronomik CLS EOS / EOS XL Clip Filter
£104.00
Polarite with Right angle finder
£72.00
EQ6 Rail Kit
£129.00
StellarTune™ EQ6/NEQ6/EQ6-R
£289.00
AVX StellarTune™
£329.00
Service 60 - Sky-watcher
£149.00
CloverFour EQ Silver
£40.00
Hypertune EQ5 Mount
£179.00
EQ6, NEQ6, NEQ6Pro Belt Modification Kit
£120.00
QHY5P-II-M Mono Camera
£199.00
QHY5L-II Colour Camera /Guide Camera
£139.00
StellarDrive™ EQ6 Class
£799.00
StarGPS Skywatcher SynScan NEQ3/EQ5/HEQ5/EQ6/NEQ6
£149.00
darkframe tuning
Newsletter
  • Contact Us
    11 Drift Road, Clanfield, Waterlooville, Hampshire, PO80JJ, United Kingdom
    +44 23 9257 0283
    dave@darkframe.co.uk
    Product Added to your Cart
    x

    -------- OR --------

    google-site-verification: google9839cfa346600d85.html