APO 204mm f/7 Triplet ED FK61
Airy Disk
The Airy Disk 204mm f/7 APO refractor is built on a triplet optical design using Hoya FCD-100 ED glass, delivering exceptional color correction and minimal chromatic aberration. This 8-inch triplet APO provides high-contrast imaging and genuine observing pleasure, making it ideal for both visual observers and astrophotographers seeking superior optical performance. With a relatively fast focal ratio of F7, it is 50 inches long (dew shield retracted) and suitable for smaller observatories. The telescope features a 4-inch 10:1 rack and pinion focuser compatible with EAF and is designed for serious observers pursuing detailed astronomical observations and high-quality deep-sky imaging.
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Specifications
| Optical design | Triplet ED (Extra-low Dispersion) |
| Focuser Type | 4-inch dual-speed 1:10 rack-and-pinion |
| Glass Type | H-FK61 CDGM |
| Focuser Thread | M134x1 |
| Length (hood extended) | 770 mm |
| Aperture | 204 mm |
| Coating | Full surface wideband multilayer |
| Tube Material | Aluminum alloy |
| Weight | 10.6 lb |
| Focal ratio | f/7 |
| Limiting Stellar Magnitude | 13.3 |
| Binoviewer Compatible | ✓ |
| Focal length | 1428 mm |
| Resolving Power | 0.57″ |
| Tube Color | White |
| Dovetail Style | Losmandy |
| Field Flattener Available | 0.8x reducer |
| Length (hood retracted) | 705 mm |