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It has an easy-to-grab textured rubber ring
8 maximum aperture make this an ideal lens for low-light photography
To adjust brightness
Belt drives provide minimal backlash and significantly reduced periodic error while remaining whisper quiet
choosing the "perfect" eyepiece from that point on is all about personal preference
PrimaLuce Lab ESATTO 3" Robotic Focuser - EST3 iOptron Strain Wave Mounts It has an easy-to-grab texturedThe PrimaLuce Lab ESATTO robotic focuser is also available in a 3" version with 76. 3mm free aperture, 25mm of draw tube travel, 8kg of payload capacity and an incredible resolution of 0,04 micron per step! The perfect solution for apochromatic refractors and Ritchey Chretien or Cassegrain telescopes, as well as heavy imaging trains with large cameras and accessories like off axis guiders, filter wheels and adaptive optics. And you can also expand
