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JTW Astrograph 200 f/4 or f/7
£1,449.00 inc. tax

£1,207.50 ex. tax
? Tax based on United Kingdom.

Description

JTW Astronomy 


The humble Newtonian telescope, done properly. These instruments are for amateurs who have outgrown their mass produced telescope. Our newtonian telescopes feature 1/8th PTV optics and an integrated corrector.

Each corrected Newtonian is available in two speeds, f/4 or f/7. This gives a choice between relatively fast deep sky or a slower system with higher native magnification for smaller DSOs or lunar/solar/planetary observations.

Please choose either f/4 or f/7 from the drop down menu at bottom of page



f/4 Specification

Aperture (mm) 200
Recommended mount type GEM
Tube tube Closed
Focal length (mm) 800
Tube length (transport) 450
Tube length (operating) 650
OTA Weight (kg) 7
Back focus 150
Focal ratio F/ 4
Fully corrected imaging circle (mm) 50
Cooling fans Primary mirror
Airflow Rear
Mirror coatings Enhanced Aluminium + SiO2 protective layer
Focuser Dual speed JTW Rhino
Tube construction Carbon fiber
Optical surface quality (Strehl, PTV) 0.97, 1/10
Primary mirror substrate Schott Supremax 33
Primary mirror cell 6 point floatation cell
Primary baffle OTA baffles
Secondary mirror substrate Schott Supremax 33
Secondary mirror cell 3 point RTV
Corrector Integrated 2-element
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



f/7 Specification

Aperture (mm) 200
Recommended mount type GEM
Tube tube Closed
Focal length (mm) 1400
Tube length (transport) 1050
Tube length (operating) 1250
OTA Weight (kg) 8
Back focus 150
Focal ratio F/ 7
Fully corrected imaging circle (mm) 50
Cooling fans Primary mirror
Airflow Rear
Mirror coatings Enhanced Aluminium + SiO2 protective layer
Focuser Dual speed JTW Rhino
Tube construction Carbon fiber
Optical surface quality (Strehl, PTV) 0.97, 1/10
Primary mirror substrate Schott Supremax 33
Primary mirror cell 6 point floatation cell
Primary baffle OTA baffles
Secondary mirror substrate Schott Supremax 33
Secondary mirror cell 3 point RTV
Corrector Integrated 2-element
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

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Product Code
- JTW-Astro200
Product Condition
- New
Brand
- JTW OTA

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    11 Drift Road, Clanfield, Waterlooville, Hampshire, PO80JJ, United Kingdom
    +44 23 9257 0283
    dave@darkframe.co.uk
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