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| Aperture |
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| Focal length |
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| Central obscuration |
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| Eff. coll. area |
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| f/ratio |
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| Back focal distance |
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| Focal range |
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| FOV |
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Aberration free |
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| Scale |
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| Hourangle range |
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| Lens 1 | Lens 2 | |
| Diameter | 290 mm | 280 mm |
| Aperture | 276 mm | 258 mm |
| Shape | convex concave, spherical | biconcave, spherical |
| Center thickness | 25.1 mm | 24.4 mm |
| Surface | antireflective coating on both sides, reflection minimum at 550 nm | antireflective coating on both sides, reflection minimum at 550 nm |
| Material | Quartz glass | Quartz glass |
Image of 1.23m-telescope (354 kByte)