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iOptron iEQ30 w/William Optics GTF 81

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Product Description

The stunning new William Optics Gran Turismo 81APO is the new jewel of the apochromatic refractor world. From the pristine white finish on the CNC to the elegant darkred beauty which has more than just good looks... New GT81 features a 3-element objective using high-quality FPL-53 extra-low dispersion glass that reduces any secondary spectrum to an unbelievable degree.

The Mount

The iEQ30 offers the next generation GoTo technology from iOptron®. It come standard with a calibrated dark field illumination polar scope, built-in GPS, and sturdy 1.5 -inch stainless steel tripod legs. Plus, it offers premium performance in an easy-to-transport package. Priced affordably – the iEQ30 is definitely worth its weight in gold.

The iEQ30 Mount

  • Specialized astrophotography mount ideal for entry-level and intermediate astrophotographers
  • Payload: 31 lbs (14kg)
  • Mount weight: 15 lbs
  • Portable, compact, and sturdy German equatorial mount with the highest Payload/Mount ratio (2.0) in the category
  • ST-4 autoguiding port capable of reverse guiding with autoprotection
  • Permanant periodic error correction (PEC)
  • Ultra-accurate tracking with temperature compensated crystal oscillator (TCXO)
  • Calibrated polar scope with dark-field illumination and easy polar alignment procedure, allowing for fast and accurate polar alignment
  • Built-in 32-channel GPS
  • #8407 controller with Advanced GoToNOVA® technology
  • Resolution: 0.1 arc second
  • Controller includes heating mechanism for working at low temperatures down to -20oC
  • RS232 port for ASCOM control
  • Includes Vixen-style mounting saddle.
  • Heavy-duty stainless steel tripod legs
  • Optional pier and hard case.
  • Accessories include: counterweight, extension bar, AC adaptor, 12V DC car plug adaptor, and RS232 cable

The William Optics GTF-81




Focal Ratio


Focal Length

478 mm

Objective Type

Five element with FPL-53 Air Spaced (2 groups), Fully Multi-Coated, STM coatings

Resolving Power

1.43 seconds of arc

Limiting Magnitude


Lens Shade


DDG Focuser

2" 360° Rotating Camera-angle Adjuster, 1:10 fine focus Focuser Travel Length 3.15" (80mm)
1.25" Adapter

1.25" Adapter

2" Brass Compression Rings

Field Stops


Tube Diameter


Tube Length

440mm Fully Retracted 
484mm Fully Extended

Tube Weight

3.7 kg

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