Astronomy Specialist

GSO 4.5" f/4.125 CARBON IMAGING NEWTONIAN OTA

$549.00AUD
SKU: GSN280C

GSO

Newtonian

TBD


 

The GSO 4.5" f/4.125 Carbon Imaging Newtonian is a fast, compact reflector telescope designed for deep sky astrophotography. The newly updated linear bearing focuser is natively compatible with the ZWO EAF electronic focusing motor.

Compared to a common f/5 Newtonian, the photographic exposure with an f/4 system is 40% shorter, making it a great time saver. This instrument is ideal for astrophotography and when used with an additional coma corrector, will deliver sharp images across a large flat field. GSO is currently developing a dedicated coma corrector for this telescope.

The 1.25" dual-speed Crayford focuser features an M42 (T2) thread for easy connection to common imaging systems. It operates at two speeds due to the 10:1 reduction mechanism for an extra fine focusing adjustment, which is paramount for astrophotography and high resolution observations. No custom bracket is required to attach the ZWO EAF.

The secondary mirror is oversized in order to have a fully illuminated field and to avoid vignetting. It is collimatable by using 3 grub screws and the offset can be adjusted by using the central spring loaded screw. The primary mirror features a centre dot for quick and straightforward collimation.

Both mirrors are made of BK7 glass which has a low thermal expansion coefficient. That means that the precise optical surfaces of the mirrors remain the same while the glass cools down over the night. 

The carbon-fibre tube is internally blackened to avoid internal reflection, enhance contrast and to absorb stray light.

  

Specifications

 

Optical design

Newtonian reflector

Objective diameter

114 mm

Focal length

456 mm

Focal ratio

f/4.125

Secondary mirror

41 mm (minor axis)

Stellar limiting magnitude

12.0

Resolving power

1.0 arc second

Light gathering power

265 times the human eye

Mount attachment

Vixen style bar

Focuser

Crayford dual speed (10:1)

Tube weight

TBD

Tube length

TBD

Tube diameter

TBD

SKU

GSN280C

 

 In the box

 

  • GSO 4.5" f/4.125 carbon OTA
  • Vixen style bar
  • Finder shoe bracket

    GSO 4.5" f/4.125 CARBON IMAGING NEWTONIAN OTA

    $549.00AUD

    Optical design

    Newtonian

    Image circle

    Focal ratio

    f/4.125

    Aperture

    114 mm

    Focal length

    456 mm

    Optical thickness

    Threads

    Cooled

    Colour or Mono

    Pixel size

    Sensor dimensions

    Resolution

    Sensor diagonal

    Quantum efficiency

    Read noise

    Fullwell capacity

    Bit depth

    FPS

    Camera backfocus

    Filter size

    Filter size

    Bandpass (FWHM)

    Bandpass (FWHM)

    Glass thickness

    Mount type

    Payload capacity

    Latitude range

    Dovetail saddle

    Slew speed

    Encoders

    Periodic error correction

    Counterweight shaft

    Azimuth adjustment range

    Internal diameter

    Illuminated diameter

    Compatible telescope external diameter

    Weight

    TBD

    Length

    Width

    Height

    View product