Askar FRA600 Quintuplet Flatfield APO Astrograph
2 754,00 €
108mm f/5.6 quintuplet flatfield astrograph — the largest FRA model. 600mm focal length with built-in flat-field correction for demanding deep-sky imaging.
Description
<![CDATA[The Askar FRA600 is the largest member of the FRA family — a 108mm f/5.6 quintuplet flatfield astrograph with 600mm focal length. Building on the optical success of the FRA400, the FRA600 delivers a larger aperture and longer focal length while maintaining the same fast f/5.6 ratio.
The quintuplet lens design ensures a perfectly flat field and exceptional chromatic correction across the entire image circle. At 108mm aperture and f/5.6, the FRA600 collects plenty of light for deep imaging while keeping exposure times manageable.
Whether targeting faint galaxy groups or large emission nebulae, the FRA600 provides the resolution and speed to produce stunning results. Like all FRA series instruments, it doubles as a premium telephoto lens for daytime use.
Key Features
- Quintuplet optical design with built-in flat field correction
- 108mm aperture, 600mm focal length (f/5.6)
- Largest and most powerful FRA series member
- Fast f/5.6 for efficient deep-sky imaging
- Each unit individually optically tested
- Dual-use: astrophotography and daytime telephoto
Specifications
| Aperture | 108 mm |
|---|---|
| Focal Length | 600 mm |
| Focal Ratio | f/5.6 |
| Optical Design | Quintuplet flatfield |
| Field Flattener | Built-in |
| Brand | Askar |
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Explore these guides from our Astro Wiki to learn more about this type of equipment:
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