ZWO 21mm M42 to M42 Extender (ZWO-T2-EXT-21) stockyIgnore 6) filters

6) filters

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%

the simplest

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

The faster f/ratio allows you to use slower film or shoot in lower light level situations and still properly expose your subject

ZWO 21mm M42 to M42 Extender (ZWO-T2-EXT-21) stockyIgnore 6) filtersThe extender is designed to help you to reach 55mm or any other back focus distance.