🔭The objective lens of a refractive astronomical telescope：D90F500 broadband film:
Caliber D:93mm Focal length F: 500mm Coating: Multi-layer broadband film
Combined image quality :1/4-1/8
Diameter tolerance :+0/ -0.12mm
Center thickness tolerance :±0.2mm
Focal length tolerance :±0.1%
Finish :60/40
Eccentric :1'
Note: Two refractive double-separation objective lens groups Used for the objective lenses and collimating objective lenses of astronomical telescopes.

🔭The objective lens of a refractive astronomical telescope：D90F900 Multi-layer blue film:
Caliber D:93mm Focal length F: 900mm Coating:Multi-layer blue film
Combined image quality :1/4-1/8
Diameter tolerance :+0/ -0.12mm
Center thickness tolerance :±0.2mm
Focal length tolerance :±0.1%
Finish :60/40
Eccentric :1'
Note: Two refractive glued objective lens groups It is used for the objective lenses and collimating objective lenses of astronomical telescopes.

🔭The objective lens of a refractive astronomical telescope：D90F900 Multimembrane:
Caliber D:93mm Focal length F: 900mm Coating:Multilayer broadband film
Combined image quality :1/4-1/8
Diameter tolerance :+0/ -0.12mm
Center thickness tolerance :±0.2mm
Focal length tolerance :±0.1%
Finish :60/40
Eccentric :1'
Note: Two refractive double-separation objective lens groups It is used for the objective lenses and collimating objective lenses of astronomical telescopes.

🔭The objective lens of a refractive astronomical telescope：D90F1000 Multimembrane:
Caliber D:93mm Focal length F: 1000mm Coating:Multi-layer broadband film
Combined image quality :1/4-1/8
Diameter tolerance :+0/ -0.12mm
Center thickness tolerance :±0.2mm
Focal length tolerance :±0.1%
Finish :60/40
Eccentric :1'
Note: Two refractive double-separation objective lens groups It is used for the objective lenses and collimating objective lenses of astronomical telescopes.