Artesky eADC V3 Sunobserver electronic atmospheric dispersion corrector (Artesky, SKU: eADC-V3) is a third-generation corrector designed for visual observing and astrophotography. Its four prisms in two groups compensate for the separation of image colour components caused by the atmosphere, which is particularly noticeable when observing objects low above the horizon. The Zero Image Shift design is intended to prevent image displacement as the correction is adjusted.
Once the compensation coefficient has been set initially, the eADC uses its built-in accelerometer to adjust the correction automatically as the object's altitude and the telescope's orientation change, including after an equatorial mount's meridian flip. The device can be operated without a computer using its rotary encoder and display, or via USB using Windows software.
• automatic adjustment of dispersion correction after initial setup
• optical design with Zero Image Shift to limit changes in image position during adjustment
• four prisms in two groups, made from CDGM F4 and H-ZK9B glass
• anti-reflection AR coatings covering 350–700 nm
• accelerometer-based orientation detection, including after a meridian flip
• standalone operation using a rotary encoder with a push button and a display for reading settings
• computer control and operating parameter readout through Windows software
• correction direction adjustment (tilt) to help reduce horizontal separation of colour components
• initial adjustment can be assisted by the ADC Alignment tools in SharpCap 4.0 or later and ASICAP
• electronic atmospheric dispersion corrector: Artesky eADC V3 Sunobserver
• application: visual observing and astrophotography
• optical design: 4 prisms in 2 groups
• prism material: CDGM F4 and H-ZK9B optical glass
• prism angle: 5.7°
• clear optical aperture: 22 mm
• anti-reflection coatings: AR, 350–700 nm range
• power supply voltage: 5 V DC
• permissible power supply voltage range: 4.5–5.5 V DC
• maximum current consumption: 400 mA; required power supply current capacity of at least 400 mA
• power supply: via USB, from a computer or a compatible power source such as a power bank
• local control: rotary encoder with a push button and digital display
• computer control: Windows software
• communication interface: USB, FTDI FT232RQ chip, virtual COM port
• dispersion compensation coefficient range: 1–999
• correction direction adjustment range (tilt): –80° to +80°
• mode 0: refractors, catadioptric telescopes and Cassegrain systems, with no diagonal or image-erecting elements between the telescope and the eADC
• mode 1: Newtonian telescopes; the longest side of the eADC housing should be parallel to the telescope tube's optical axis
• software readouts: electronics temperature, object altitude, compensation coefficient, operating mode and tilt setting
• automatic software data refresh: optional, every 4 s
• initialisation time after power-on: approx. 60 s
• automatic setting storage: 4 s after adjustment stops
• recommended system focal ratio: f/10 or slower
• recommended object altitude range above the horizon: approx. 10–82°
• dimensions (length × width × height): 59.0 × 89.6 × 80.4 mm
• weight: 267 g
• barcode (EAN): 8052278165747
For faster optical systems, such as f/7, f/5 or f/4, the manufacturer recommends placing a focal extender before the eADC to reduce additional aberrations. The camera sensor should also not be placed too close to the prisms. In mode 0, any diagonal should be positioned after the corrector, on the eyepiece side.
At object altitudes below approximately 10°, the available correction range may be insufficient. Above approximately 82°, the manufacturer recommends removing the eADC from the optical train, as the corrector may then introduce additional colour separation.
The Artesky eADC V3 Sunobserver helps maintain the selected dispersion correction as the observed object's position changes, reducing the need for manual adjustment during an observing or imaging session.
