ZWOADC

ZWO ADC (Atmospheric Dispersion Corrector) - T2 and 1.25" connection

Brandname: ZWO
Connection (object side): 31,7mm(pos) & T2(neg)
Connection (observer side): 31,7mm(neg) & T2(pos)
lightpass: x
Shipping weight: 1kg
EAN Code:
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corrector for atmospheric dispersion

Find a good description and hints for usage here:
Link zu Skyinspector ADC