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IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
iOptron iAFS2 - iOptron 2'' Inline Automatic Focuser

iOptron iAFS2 - iOptron 2'' Inline Automatic Focuser

by iOptron
SKU IOP-FA20
$459.00 - $459.00
$459.00
$459.00 - $459.00
$459.00
Price Match Policy!
  • Supports a maximum payload of 5kg without slippage
  • Delivers 0.6µm focusing resolution for critical imaging
  • Features a 51mm clear aperture for full-frame sensors
  • Provides 30mm of drawtube travel
  • Connects via two USB2.0 Type-C ports
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • iAFS2 - iOptron 2'' Inline Automatic Focuser

    The iOptron iAFS2 is an inline automatic focuser engineered to eliminate image shift, supporting a heavy 5kg payload with its patented iLock™ lead worm drive. It provides 30mm of precise travel with a resolution of 0.6µm, ensuring critical focus across your entire imaging session. With a generous 51mm clear aperture, the 783g focuser avoids vignetting on large sensors, while dual USB2.0 Type-C ports provide robust connectivity for ASCOM and INDI control.

    iLock™ Lead Worm Drive: The 5kg Zero-Shift System

    At the core of the iAFS2 is a lead worm movement system that passively locks the drawtube's position the moment the motor stops. This iLock™ technology provides exceptional rigidity, holding up to a 5kg imaging train firm without any backlash or slippage, even when your telescope is pointed at the zenith. This design ensures that your critical focus point is maintained throughout temperature changes and slews across the sky.

    Triple Control: 0.6µm Precision via ASCOM, Buttons, or Manual Wheel

    The iAFS2 offers three independent methods for focus control, giving you complete command over its 0.6µm step size. For automated imaging, it connects to your PC via dual USB-C ports and is fully compatible with ASCOM and INDI drivers for seamless integration with software like NINA or SharpCap. For field adjustments, you can use the responsive onboard directional buttons for powered manual control, or use the large manual focusing wheel for unpowered, tactile adjustments.

    51mm Clear Aperture and Built-in Temperature Sensing

    Engineered for modern astro-imaging, the iAFS2 features a 51mm clear aperture, preventing vignetting on full-frame and other large-format sensors. A built-in temperature sensor provides real-time data to your autofocusing software, enabling automatic focus compensation as ambient temperature drops. The focuser also includes a camera angle adjuster for precise framing of your target, making it a complete solution for a robust imaging train.

  • What is the iLock™ technology in the iOptron iAFS2?

    iLock™ is iOptron's patented focusing mechanism that uses a lead worm drive. This system is designed to be self-locking; when the stepper motor is not moving, the drawtube is passively held in place. This prevents any focus shift or slippage caused by gravity, even with a heavy payload up to 5kg.

    How much weight can the iAFS2 focuser support?

    The iOptron iAFS2 is rated for a maximum payload of 5kg (11 lbs). This capacity allows it to easily handle a complete imaging train, including a cooled astronomy camera, filter wheel, and off-axis guider, without risk of slipping.

    Can I use the iAFS2 focuser manually if my computer or power fails?

    Yes. The iAFS2 is designed with a large manual focusing wheel that allows you to make precise adjustments even without power. This provides a reliable backup and is useful for initial setup or visual observation.

    What software is compatible with the iOptron iAFS2 for autofocusing?

    The iAFS2 is compatible with any software that supports the ASCOM or INDI platforms. This includes popular astrophotography acquisition software such as:

    • NINA (N.I.N.A.)
    • SharpCap
    • Sequence Generator Pro (SGP)
    • KStars/Ekos

    How does the 51mm clear aperture of the iAFS2 benefit imaging with a full-frame camera on my SCT?

    The 51mm clear aperture is larger than the diagonal of a full-frame sensor (approx. 43mm). When used with a Schmidt-Cassegrain Telescope (SCT) and a compatible reducer, this ensures that the light cone is not clipped by the focuser itself, preventing vignetting (darkened corners) and providing even illumination across the entire sensor.

    Will the iAFS2 consume significant back focus in my imaging train?

    Yes, as an inline focuser, the iAFS2 will consume a portion of your available back focus. The exact amount depends on the telescope adapter used (sold separately). Before purchasing, you should measure the back focus of your specific telescope and imaging train to ensure you have enough space to accommodate the focuser body and achieve focus.

  • Focuser Type Inline Auto Focuser with iLock™
    Focuser Size 2"
    Clear Aperture 51mm
    Drawtube Travel 30mm
    Focusing Resolution 0.6µm
    Maximum Payload 5kg
    Driving Train Stepper motor
    Computer Control Yes (ASCOM and INDI)
    Automatic Focusing Yes
    Motorized Buttons Yes
    Manual Focusing Yes (with or without power)
    Temperature Sensor Yes (Built-in)
    Camera Angle Adjustment Yes
    Power/Communication USB2.0 Type-C port (x2)
    Dimensions 90.5 X 106 X 82mm
    Weight 783g

    • iAFS2 Inline Automatic Focuser

      × 1

    • 2" Visual Back

      × 1

    Please Note: A telescope-specific adapter is required for connection and is NOT included.

  • iOptron 2-Year Limited Warranty