OTA · 2020–
Takahashi FC-100DZ
Key specifications
| Aperture | 100 mm |
|---|---|
| Focal length | 800 mm |
| Focal ratio | f/8 |
| Optical design | Fluorite Doublet |
About
Latest 100 mm fluorite Steinheil doublet, 800 mm focal length at f/8. Pairs the rear fluorite element with a high-index low-dispersion mate, raising Strehl above 97.6% and roughly halving residual blue halo versus the earlier FC-100D.