
Triplet
APO Design
Versatile usage
Ideal for both visual and imaging, compatible with various flatteners and Barlow lenses.
Extra-low Dispersion glass
Contains Extra-low Dispersion (ED) glass, delivering sharp, vibrant images with true-to-life colors while significantly reducing chromatic aberration.
High-precision polishing
Our lenses undergo high-precision polishing, setting a standard of excellence that surpasses industry norms, ensuring optimal performance in all conditions.
Lens Type
Triplet APO Prime Lens
Triplet APO Prime Lens
Triplet APO Prime Lens
Focal Length
419 mm
478 mm
478 mm
Diameter
71 mm
81 mm
81 mm
Focal Ratio
f/5.9
f/5.9
f/5.9
Image Circle
44 mm
45 mm
45 mm
Focuser
2.5" R&P Focuser
Compatible with EAF
Compatible with EAF
2.5" R&P Focuser
Compatible with EAF
Compatible with EAF
WIFD R&P Focuser
Compatible with EAF
Compatible with EAF
Bundles
[Bundle] Gran Turismo 71 Astro Imaging Package
Sale price$934.00 USD
[Bundle] Gran Turismo 81 IV Astro Imaging Package
Sale price$1,402.00 USD




![[Bundle] Gran Turismo 71 Astro Imaging Package](http://williamoptics.com/cdn/shop/files/GT-71_Flat6AIII.jpg?v=1727404357&width=2400)
![[Bundle] Gran Turismo 81 IV Astro Imaging Package](http://williamoptics.com/cdn/shop/files/GT-81-IV_Flat6AIII-red.jpg?v=1721029434&width=2400)
![[Bundle] Gran Turismo 81 IV Astro Imaging Package](http://williamoptics.com/cdn/shop/files/GT-81-IV_Flat6AIII.jpg?v=1721029292&width=2400)