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        Model:Fresnel Lens
        1. Material: Optical glass (high borosilicate, K9, BK7, BK270)
        2. Light transmission: 95% (97% after coating)
        3. Refractive index: 1.474
        4. Operating temperature: -50-500 degrees
        5. Size introduction: External diameter: 74mm,Height: 5.7mm, Steps: 3mm 6. Lighting Angle: 110°
        1.Material: aluminum
        2.Operating temperature: -50-500 degrees
        3.Dimensions: Frame diameter: 69mm, Inner hole diameter: 44mm, Hole position: 62.2mm, Height 8.0mm
        4.Companion Lens Introduction: GT-50-21, GT-50-23, GT-50-52, GT-50-53
        1.Material: aluminum
        2.Operating temperature: -50-500 degrees
        3.Dimensions: Frame diameter: 90mm, Inner hole diameter: 61mm, Hole position: 79mm, Height 8.0mm
        4.Companion Lens Introduction: GT-66-6,GT-66-8,GT-66-11,GT-66-14
        1.Material: aluminum
        2. Operating temperature: -50-500 degrees
        3. Dimensions: Frame diameter: 100mm, Inner hole diameter: 72mm, Hole position: 90mm, Height 9.0mm
        4. Companion Lens Introduction: GT-78-3,GT-78-4,GT-78-24,GT-78-22.
        1.Material: aluminum
        2.Operating temperature: -50-500 degrees
        3.Dimensions: Frame diameter: 90mm, Inner hole diameter: 63mm, Hole position: 78mm, Height 8.0mm
        4.Companion Lens Introduction: GT-67-7,GT-67-42.
        1.Material: aluminum
        2.Operating temperature: -50-500 degrees
        3.Dimensions: Frame diameter: 116mm, Inner hole diameter: 85mm, Hole position: 105mm, Height 9.0mm
        4.Companion Lens Introduction: GT-92-2,GT-92-2-6, GT-92-13.
        1.Material: aluminum
        2.Operating temperature: -50-500 degrees
        3.Dimensions: Frame diameter: 122mm, Inner hole diameter: 98mm, Hole position: 113mm, Height 8.0mm
        4.Companion Lens Introduction: GT-100-5, GT-100-7,GT-100-20, GT-100-35.
        1.Material: aluminum
        2.Operating temperature: -50-500 degrees
        3.Dimensions: Frame diameter: 121.5mm, Inner hole diameter: 98mm, Hole position: 113mm, Height 8.0mm
        4.Companion Lens Introduction: GT-100-4.
        1.Material: aluminum
        2.Operating temperature: -50-500 degrees
        3.Dimensions: Frame diameter: 138mm, Inner hole diameter: 98mm, Hole position: 128mm, Height 8.0mm
        4.Companion Lens Introduction: GT-114.
        1.Material: aluminum
        2.Operating temperature: -50-500 degrees
        3.Dimensions: Height 8.0mm
        4.Companion Lens Introduction: GT-110,GT-110-27.
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