| Code | Definition |
|---|---|
| Mc | Maksutov-Cassegrain |
| Mn | Maksutov-Newtonian |
| N | Newtonian |
| Ra | Apochromatic Refractor |
| Rc | Achromatic Refractor |
| Rp | Plain Refractor |
| Sc | Schmidt-Cassegrain |
| Sn | Schmidt-Newtonian |
 |
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