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JTW Astrograph 400mm f/4 or f/7
£7,269.00 inc. tax

£6,057.50 ex. tax
? Tax based on United Kingdom.

Description

JTW Astronomy Astrograph 400mm (f/4 or f/7)


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) 400
Recommended mount type GEM
Tube tube Closed
Focal length (mm) 1600
Tube length (transport) 1150
Tube length (operating) 1450
OTA Weight (kg) 34
Back focus 150
Focal ratio F/ 4
Fully corrected imaging circle (mm) 50
Cooling fans Primary and secondary mirror
Airflow Laminar flow & 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 18 point floatation cell
Primary mirror edge support 6 point athermalised
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) 400
Recommended mount type GEM
Tube tube Closed
Focal length (mm) 2800
Tube length (transport) 2350
Tube length (operating) 2650
OTA Weight (kg) 37
Back focus 150
Focal ratio F/ 7
Fully corrected imaging circle (mm) 50
Cooling fans Primary and secondary mirror
Airflow Laminar flow & 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 18 point floatation cell
Primary mirror edge support 6 point athermalised
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-Astro400
Product Condition
- New
Brand
- JTW OTA

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