OTA · 2017–
Takahashi FSQ-85EDX
Key specifications
| Aperture | 85 mm |
|---|---|
| Focal length | 450 mm |
| Focal ratio | f/5.3 |
| Optical design | Quadruplet APO |
| Back focus | 197.5 mm |
| Weight | 3.6 kg |
All specifications
| Lens coating | Hard multicoatings |
|---|---|
| Focuser type | Rack-and-pinion, 1/7 microfocuser |
| Tube length | 623 mm |
About
85 mm modified-Petzval ED quadruplet astrograph, 450 mm focal length at f/5.3. Two ED elements (objective doublet plus an air-spaced Petzval doublet acting as field flattener) deliver a flat, color-corrected field for full-frame imaging.
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