ZWO 21mm M42 to M42 Extender (ZWO-T2-EXT-21) stockyIgnore the Reducer/Corrector lens does diminish

the Reducer/Corrector lens does diminish a small amount of field curvature common to all Schmidt Cassegrain telescopes but does not eliminate it

and the focal length can be shortened to 414mm

field flatteners

5mm Cooling Regulated Two-Stage TEC Delta T 35°C-35°C below ambient Camera Power consumption 650mA at 5V Cooler Power consumption 12V at 3A Max Working Temperature -5°C — 45°C Storage Temperature -20°C — 60°C Working Relative Humidity 20% — 80% Storage Relative Humidity 20% — 95%

ZWO 21mm M42 to M42 Extender (ZWO-T2-EXT-21) stockyIgnore the Reducer/Corrector lens does diminishThe extender is designed to help you to reach 55mm or any other back focus distance.