The new Star 71 features a 4 element design. 2 + 2 with two FPL53 ED elements instead of a 5 element system 3+2 with one FPL53 ED element as on the original scope.
This is to produce a telescope with better collimation stability.
All scopes are tested by us on an artificial star to check for collimation prior to despatch.
The Star 71 has 30mm corrected circle and is a good choice for APS-C sized sensors or smaller, it also features a decent dual speed rack and pinnion focuser with rotator which terminates in a male 48mm thread.
An EOS adaptor is included and we can also supply Nikon and T adaptors.
This telescope is designed for astrophotography and does not work with standard 1.25" and 2" pushfit diagonals.
An optional ultra low profile 1.25" screw thread diagonal is available from William Optics.
Includes Soft Carry Case
71mm f/4.9 Imaging Refractor Telescope.
4-element design with two FPL-53 ED glass elements for enhanced colour correction.
Does not require not a flattener/reducer.
Covers 30mm APS-C size imaging circle.
2.5" dual speed R&P focuser.
Includes tube-rings and Vixen style dovetail.
Total weight: 2.4 kg / 5.3 lbs .
Focuser drawtube travel = 1.38" / 35mm.
The stunning new William Optics Gran Turismo 81 APO is the new jewel of the apochromatic refractor world. From the pristine white finish on the CNC to the elegant gold trim 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.
Triplet air-spaced objective (FPL-53) in adjustable CNC machined ultra high precision lens cell.
Excellent color correction.
Each lens is Fully Multi-Coated with a special super-high transmission coating (STM Coating) on all surfaces.
This F/5.9 lens is ideal for astrophotography.
2.0" R&P Focuser
Extra-smooth 360 deg. rotatable 2" R&P focuser with 1:10 dual speed: a treat to use during astrophotography. No image shifting!
Comes with two locking screws on angled positions for heavy load applications.
Large aluminum knob with installed thermometer.
Stainless steel reinforcement inserts on both sides and on the back to allow heavy loading without problems.
Graduated scale for precise camera alignment.
Simply Beautiful Finish
Pure William Optics quality fit and finish: powder-painted white CNC-machined aluminum tube, gold trim finish, retractable dewshield, 360 deg. rotatable R&P focuser, dewshield cap.
Top quality anodizing.
Very compact for carrying on flights.
Attention to Details
2" & 1.25" adapter included in the price.
Anti-marring brass compression rings.
Carry handle with V-shape night glowing illuminator.
90mm mounting rings are optional.
Though you will never need it, you have a 2-year warranty from WO.
Includes Mounting Bracket, Guider/Finder Rings and Carry Handle
Click here for Flattener 6 Spacing Requirements
** All Scopes optically checked prior to despatch**
Focal Ratio F/5.9
Focal Length 478 mm
Objective Type Three element with FPL-53 Air Spaced, Fully Multi-Coated,STM coatings
Resolving Power 1.43 seconds of arc
Limiting Magnitude 12.2
Lens Shade Retractable
2" 360° Rotating Camera-angle Adjuster, 1:10 fine focus
1.25" Adapter 2" Brass Compression Rings
Field Stops Knife-Edge Baffles
L-type Mount Bracket
Tube Diameter 90mm
Tube Length 440mm Fully Retracted
484mm Fully Extended
Tube Weight 3.7 kg
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