Astronomy Specialist

ZWO EFW 8 x 1.25" / 31mm

$321.00 USD
SKU: ZWO-EFW-8x1.25

ZWO


Options

 

The ZWO Electronic Filter Wheel weighs only 400 grams, it is CNC machined and the optical thickness is only 20mm. This model can take 8 x 1.25″ mounted or 31mm unmounted filters.


The power absorption of the EFW is only 120mAh @ 5V so any USB cable can power it up.

The distance between the filter and sensor of the Pro cameras like the ASI1600 is circa 10mm. This close distance prevents any vignetting with 1.25″ filters for telescopes up to f/5. For f/2 lenses/telescopes it is necessary to use 31mm filters.

 


 

The EFW fits 1.25″ filters with a maximum thickness of 7mm + 3mm for the thread. To install 1.25" filters:

  1. Take the back cover off
  2. Lay the wheel down flat
  3. Screw on the filters
  4. Put the back cover on

To install 31mm and 36mm filters:

  1. Take the back cover off
  2. Lay the wheel down flat
  3. Hold the filters by the very edges and lay them on the filter wheel slots
  4. Lock each filter with a "mask" and a set of M2 screws
  5. Put the cover back on

To use the filter wheel:

  1. Install the ASCOM driver on your computer
  2. Plug in the USB2.0 cable
  3. On the Ascom options, select ZWO filter wheel (1) or ZWO Filter Wheel (2). There are two options to allow 2 filter wheels at the same time. 

How to connect with the camera and telescope?

 

Compatible filters 8 x 1.25" / 8 x 31mm unmounted
Ports
USB
Power draw 120 mA @ 5A
Power supply USB cable
Maximum thickness of the filter 7 mm (not including threads which must be less than 2.7 mm)
Optical thickness 20 mm
Camera connection
M42 x 0.75 female
Telescope connection M42 x 0.75 female
Camera compatibility 4/3" and smaller ASI cooled cameras or cameras with a male M42 x 0.75 thread
SKU ZWO-EFW-8x1.25

 


     

     

    1. 8 x 1.25" / 31mm EFW body
    2. 1.25″ cover
    3. T2 nosepiece
    4. 1.25″ holder (with cover and 2 screws)
    5. T2-T2 adapter (male)
    6. Filter masks
    7. USB 2.0 cable (2m)
    8. Phillips head screwdriver
    9. M2 screws

     

     

     

    55mm backfocus with 4/3" or 1" cooled cameras

     

     

     

    55mm backfocus with 4/3" or 1" cooled cameras and OAG

     

    Customer Reviews

    Based on 3 reviews
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    M
    Maximillian Kirlin

    ZWO EFW 8x1.25" / 8x31mm / 7X36mm

    W
    Wyatt Blanda

    ZWO EFW 8x1.25" / 8x31mm / 7X36mm

    B
    Brianne Konopelski

    ZWO EFW 8x1.25" / 8x31mm / 7X36mm

    ZWO EFW 8 x 1.25" / 31mm.

    ZWO EFW 8 x 1.25" / 31mm

    $321.00 USD

    Options

    • 8 x 1.25" / 31mm

    Optical design

    Image circle

    Focal ratio

    Aperture

    Focal length

    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

    1.25", 31 mm

    Filter size

    1.25", 31 mm

    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

    Length

    Width

    Height

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