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Product Description
The refreshed, budget-friendly iteration of FRA400, is suitable for astrophotography, daily photography, and visual observation.
Key FRA400C Features
- Quintuplet ED Refractor: The FRA400C features a 72mm aperture, 400mm focal length, and a focal ratio of 5.6. It adopts a quintuplet lens design with two ED glasses, supporting a 44mm full-frame image circle.
- Self-Flattened Design: The optical structure of FR4A400C is the same as that of the FRA400, which is also designed with a Petzval-like optical structure, eliminating the need for specific back focus calculations. Between 50mm and 60mm connection distance, users can directly use it for shooting after the OTA is in focus.
- Petzval Structure: Integrated self-flattened design, supporting a 44mm full-frame image circle, no need for additional flatteners, and no need for additional calculation of the back focus. Between 40mm and 70mm connection distance, users can directly use it for shooting after the OTA is in focus.
- Retractable Dew Shield: The dew shield is a retractable design that can be pulled out when used. It protects the lens from the impact of external and internal light and protects the lens itself.
- Integrated Helical Focuser: One-speed helical focuser with a locking screw for easy use, it designs MXL-type synchronous gears, compatible with MXL timing belt for electronic focusers. The focus adjuster is an adjustable damping structure, which can increase the damping of the focus adjuster and make the use more stable in astrophotography. In daily photography, it can help the faster focus.
Other FRA400C Features
- Versatile Applications: The FRA400C is mechanically optimized for different applications. Users can use it for astrophotography, daily photography, and visual observation.
- Retractable Lens Hood: The FRA400C is equipped with a retractable lens hood and an engraved nameplate ring inside.
- Adjustable Aperture: The FRA400C's aperture ranges from F22 ro F5.6, with marked scales on the tube for step-based adjustments to prevent accidental changes in to preserve settings.
- Expandable Multi-Hole Quick-Release Tube Ring: The FRA400C features an improved expandable tube ring with four sets of M4 and M6 threaded holes for different accessory mounting. Two finder bases are included for attaching astronomical accessories.
- Multi-Functional Handle Bar: At the bottom of the tube ring, the FRA400C designs a multi-functional handle, it includes multiple holes for mounting dovetail plates or equipment. It also has M6, 1/4", and 3/8" threaded holes for tripod mounting. The handle doubles as a carrying grip when the telescope is flipped.
- Dovetail Plate: Standard 290mm Vixen-style dovetail plate for smooth installation and handling.
- Rotation: The entire OTA can be rotated to adjust angles during imaging.
- Multiple Included Photographic Adapters: The FRA400C rear-end features a four-piece photographic adapter (M72-M54-M48), with a built-in 2" filter thread in the M48 adapter.
- Visual Observation Adapters: Includes 1.25" and 2" eyepiece adapters for visual observation.
What's in the Box
Specifications
| Aperture | 72mm |
| Focal Length | 400mm |
| Focal Ratio | f/5.6 |
| Objective Type | Quintuplet Dual-ED Air-Spaced Petzval APO |
| Image Circle | 44mm |
| Aperture Blades | 17 |
| Graded Aperture | f/5.6 - f/22 |
| Close Focus Distance | 5m |
| Focusing Mode | Manual focus |
| Filter Diameter | M82 |
| Rear-End Adapter | M72 / M54 / M48 (with M48×0.75 filter thread) |
| Rear-End Connection Distance | Supports 50-60mm range (Recommended connection length is 55mm) |
| Total Length | 420mm (inclulding dew shield); 370mm (without dew shield) |
| OTA weight | 2680 g |
| Total weight (including handle & dovetail plate) | 3180 g |
Optical Path
Spot Diagram
Longitudinal Aberration:
What can I see with a Askar FRA400C Quintuplet Petzval Flat-Field Astrograph (FRA400C)?
Here are some simulated views of common objects. Results with your telescope will vary with viewing conditions, obrits, equipment and more.
Jupiter with
25mm Eyepiece - 16x Magnification
(Sold Separately)
Jupiter with
10mm Eyepiece - 40x Magnification
Sold Separately
Jupiter with
5mm Eyepiece - 80x Magnification
Sold Separately
Moon with 25mm Eyepiece
16x Magnification
(Sold Separately)
Moon with 10mm Eyepiece
40x Magnification
Sold Separately
Moon with 5mm Eyepiece
80x Magnification
Sold Separately
Andromeda with 36mm Eyepiece
11x Magnification
Sold Separately
Andromeda with 25mm Eyepiece
16x Magnification
(Sold Separately)
Andromeda with 10mm Eyepiece
40x Magnification
Sold Separately
