20d 78d 90d For Slit Lamp Retinal Lens Fundus Aspheric Ophthalmic Diagnostic

20D Specifications:
1. Magnification ratio: 3.13X
2. Static FOV: 46°
3. Working distance: 50mm
4. Clear Aperture: Ø48mm
5. Dimension: Ø56*20mm
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78D Specifications:
1. Magnification ratio: 0.93X
2. Static FOV: 81.4°
3. Working distance: 8.0mm
4. Clear Aperture: Ø26mm
5. Dimension: Ø33*15mm
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90D Specifications:
1. Magnification ratio: 0.76X
2. Static FOV: 74.2°
3. Working distance: 7.0mm
4. Clear Aperture: Ø21mm
5. Dimension: Ø27*13mm