1pc Refractive Astronomical Telescope Double Separation Objective Lens D=90mm - 500mm/650mm/1000mm Focal Length(D90F1000 Green Film)

Description

• Premium 90mm diameter double separation objective lens devised for refractive astronomical telescopes, enhancing your stargazing experience.
• Available in multiple focal lengths: 500mm, 650mm, and 1000mm, catering to various observational needs and preferences.
• Coating options include multi-layer green film and blue film, ensuring optimal light transmission and image clarity.
• Precision-engineered with strict tolerances for diameter, center thickness, and focal length, delivering exceptional image (1/4-1/8).
• Includes one complete lens assembly, perfect for both objective and collimating lens applications in your telescope setup.

The objective lens of a refractive astronomical telescopeD90F500 broadband film:
Caliber D:93mm Focal length F: 500mm Coating: Multi-layer broadband film
Combined image :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 telescopeD90F900 Multi-layer blue film:
Caliber D:93mm Focal length F: 900mm Coating:Multi-layer blue film
Combined image :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 telescopeD90F900 Multimembrane:
Caliber D:93mm Focal length F: 900mm Coating:Multilayer broadband film
Combined image :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 telescopeD90F1000 Multimembrane:
Caliber D:93mm Focal length F: 1000mm Coating:Multi-layer broadband film
Combined image :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.

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