With the ZWO ADC Mark II, you maintain truly natural colors of stars and planets, even low on the horizon. Atmospheric refraction in our atmosphere splits light into an unwanted rainbow edge: a “color fringe” that can’t be corrected with regular lens correction. The ADC Mark II addresses this with two precisely adjustable prisms that create an opposite refraction, causing all wavelengths to converge again. The result is a razor-sharp, color-accurate image – from Jupiter’s bands to Saturn’s rings – at any height in the sky.
Key benefits
✓ Natural colors, precise details
Helps you see planets and brightest stars without rainbow edges, from sunrise to deep into the night.
✓ Continuous sharpness
Works from ∼15° above the horizon, allowing you to observe and photograph longer.
✓ Easy adjustment
Two rotating knobs quickly set your prism “s at the right angle; locking ring keeps everything firmly in” place.
✓ Direct connection
T2 threading on both sides, plus 1.25″ eyepiece interface for telescopes and cameras.
✓ Optimal light transmission
Multi-layer anti-reflection coating (300-700 nm) retains up to > 98% of the light.
✓ Lightweight design
Only 200 g, made of black anodized aluminum for stable, vibration-free performance.
Practical tips
• Combine with a short Barlow lens (2×-3×) if your system is faster than f/10
• Ideal for both visual observation and high-quality planetary photography
• Read our blog “How to use the ADC for perfect planet images” for step-by-step instructions
Technical specifications
- Connections: T2 (M42 × 0.75) male on both camera and telescope side
- Eyepiece interface: 1.25″ (31.7 mm)
- Prisms: crystalline silicate glass, rotatable with locking ring
- Coating: multi-layer AR 300-700 nm (>98% transmission)
- Weight: 200 g
- Material: CNC-machined aluminum, black anodized
- Application: visual and photographic use
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