Showing all 5 results
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not ratedWilliam Optics GT81 IV APO
- Only Gold in stock, more colours available soon
- Lens Diameter: 81mm
- Focal length: 478mm
- Speed: f5.9
- 2.5″ Focuser
- Maximum meaningful magnification: 202.5x
- Minimum meaningful magnification: 12.96x
- Maximum resolution (arcsec / pixel): 1.43
- Limit Magnitude: 12.43
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not ratedWilliam Optics RedCat 51 APO f/4.9
- Interchangeable Camera Mount
- Full Frame/ APS-C Compatible
- World’s Sharpest 250mm
- Apochromatic FPL-53 Lens
- Super Bright Bahtinov Mask
- Dual Spec Mounting Base
- Field Rotator for framing
- Small and easy to store
- 48mm Filter slot in the adaptor
- Modular Mounting Options
- Invertable Sun Shade/ Dew Shield
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not ratedWilliam Optics ZenithStar 61 II
- Available in Gold, Red and Space Grey
- New tube ring
- Real Vixen style dovetail
- Handle with guide scope option
- CNC made
- Lens Diameter: 61mm
- Focal length:360mm
- Speed: f5.9
- Maximum meaningful magnification: 152x
- Maximum resolution (arcsec / pixel): 1.9
- Image circle (mm):43
- Limit Magnitude: 11.63
- Coatings: Others
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not ratedWilliam Optics ZENITHSTAR 73 III
- Lens Diameter: 73mm
- Focal length: 430.7mm
- Doubled FPL 53 optic
- Weight: 2.5 kg
- Speed: f5.9
- Maximum meaningful magnification (x): 182.5
- Minimum meaningful magnification (x): 11.68
- Maximum resolution (arcsec / pixel): 1.59
- Limit Magnitude: 12.02
- Coatings: STM-Coated
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not ratedWilliam Optics Zenithstar 81 APO III
- Lens Diameter: 81mm
- Focal length: 558.9mm
- Speed: f6.9
- Maximum meaningful magnification: 202.5 x
- Minimum meaningful magnification: 12.96 x
- Maximum resolution (arcsec / pixel): 1.43
- Limit Magnitude: 12.24
- Coatings: Others
- Available in blue – More colours available soon
