HIGHLIGHTS: High precision stepper motor with position over-run protection Built-in temperature sensor Built-in CAA Quiet, smooth, fast operation Compact and lightweight Zero backlash Dual USB-C port for computer connection and firmware upgrade ASCOM and INDI compatible Low power consumption with USB2.0 (type-C) powering Manual adjustment (powered or unpowered) Position memorizing during power off Compatible with most OTAs with proper adapter Introducing the most versatile inline auto focuser: the iOptron iAFSTM focuser with iLockTM technology! Utilizing a lead worm movement is the key to the iAFS focusers patented design; this method passively locks it at the exact position when movement is stopped, maintaining focus for most any sized payload even as the instrument angle is changed. The iAFS incorporates three movement control modes, USB (computer control), on board directional buttons (for powered manual adjustments) and a manual focus wheel to override the motorized adjustment. Other features include a built-in temperature sensor, dual USB-C ports, solid all metal body, fingerprint resistant surface, 0.6 micron resolution, and position limiters to prevent over runs. It comes standard with a 2 inch visual back, and optional telescope adapters to fit various OTAs are available. The iAFS focusers is available as the iAFS2 two inch model and the iAFS3 three inch version.2" Visual Back IncludedTelescope Adapter NOT included Features High precision stepper motor with position over-run protection Built-in temperature sensor Built-in CAA Quiet, smooth, fast operation Compact and lightweight Zero backlash Dual USB-C port for computer connection and firmware upgrade ASCOM and INDI compatible Low power consumption with USB2.0 (type-C) powering Manual adjustment (powered or unpowered) Position memorizing during power off Compatible with most OTAs with proper adapter Package includes: 1X iAFS2 2" focuser 1X 2" Visual Back (P-FA20-VB) 2X USB2.0 (Type-C) cable Optional Adapters P-FA20-M0800iAFS2 telescope adapter Askar/65PHQ and other M80X1 P-FA20-M0835iAFS2 telescope adapter Celestron/C11 and other M83.5X1.5 P-FA20-M0900iAFS2 telescope adapter GSO/RC6,RC8 and other M90X1 P-FA20-CAiAFS2 camera adapter M48X0.75 P-FA20-M0508iAFS2 telescope adapter for Celestron C6/C8/C9.25/EdgeHD800 (2"-24TPI) P-FA20-M0776iAFS2 telescope adapter for BORG 80 Series (M77.6X0.75) P-FA20-M0580iAFS2 telescope adapter for iOptron/Bosma MAK150 (M58X0.75) P-FA20-M0762iAFS2 telescope adapter for TeleVue 76/85 Series telescopes (3"-24TPI) P-FA20-NewtGiAFS2 telescope adapter for GSO Newt Imaging 2" focuser Other iAFS2 adapters are coming ... Can't find your adapter? You have two options:(1) Send a detailed telescope focuser end drawing to iOptron and we'll try to make one for you; or(2) GoTo Build-an-Adapter to customize one. Select your telescope on Telescope or Objective side Select "Other brand names" on Camera or Eyepiece side Click on Next Select your telescope model Select "iOptron iAFS2 E-Focuser" Select "Adapter Effective Length." It is important for some telescopes, which has a built-in flattener as an example. Enter 0mm otherwise. Click on Build Check the design carefully before place the order. iOptron does not assume any responsibility for a non-fitting adapter Technical Specs Focuser Inline Auto Focuser with iLock™ Focuser Size 2" Dimensions 90.5 X 106 X 82mm Weight 783g Clear Aperture 51mm Maximum Payload 5kg Drawtube Travel Distance 30mm Focusing Resolution 0.6um Power/Communication Port USB2.0 Type-C port X2 Driving Train Stepper motor Computer Control Yes (ASCOM and INDI) Automatic Focusing Yes Motorized Focusing Button Yes Manual Focusing Yes (w or w/o motor power on) Temperature Sensor Yes (Built-in) Camera Angle Adjustment Yes Warranty One year limited