Askar FRA400C 72mm f/5.6 Quintuplet Petzval Flat-Field Astrograph
Ships by Next Business Day
Contiguous US Customers:
All items we sell ship for free within the Contiguous US. Shipping will be via the cheapest shipping method which will vary depending on the items in your order. During checkout, you may also be shown other optional faster shipping choices.
US Customers in Hawaii and Alaska:
Free shipping applies to almost all products. A few large telescopes and mounts are excluded from this free shipping offer. For these items, please contact us to obtain a shipping quote before you check out using the online shopping cart.
International Customers:
Free shipping does not apply to international orders. During check-out, you will be presented with several shipping choices and costs. However, the export of some items may be restricted outside the US due to size or manufacturer restrictions.
Askar FRA400C - High Quality Multi-functional Astrograph
The refreshed, budget-friendly iteration of the FRA400 is suitable for astrophotography, daily photography, and visual observation
Quintuplet ED Refractor
The FRA400C features a 72mm aperture, 400mm focal length, and a focal ratio of f/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 the FRA400C is the same as that of the FRA400, which is also designed with a Petzval-like optical design, 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.
Versatile Applications
The FRA400C is mechanically optimized for different applications. You can use it for astrophotography, daily photogoraphy, and visual observation.
Retractable Lens Hood
The FRA400C is equipped with a retractable lens hood and an engraved nameplate ring.
Adjustable Aperture
The aperature ranges of the FRA400C is from f/22 to f/5.6, with marked scales on the tube for step-based adjustments to prevent accidental changes and preserve settings.
Integrated Helical Focuser
One-speed helical focuser with a locking screw for easy use, it uses MXL-type synchronous gears, compatible with MXL timing-belt for electronic focusers (note that the gear and timing belts are not included; please see the photos above showing the specifications of the gear and belts for various popular focusers). The focus adjuster is an adjustable damping structure, which can increase the damping of the focus adjuster and make it more stable for astrophotography. In daily photography, it can help increase focus speed.
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 incorporates 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.
Four-Piece Photographic Adapter
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 2" and 1.25" eyepiece adapters for visual observation.
Optional Full-Frame Reducer
The optional 0.7x FRA400C reducer shortens the total focal length to 280mm, and the focal ratio to f/3.9, it supports a 44mm full-frame image circle. Note: Not compatible with the FRA400.
Specifications
- Aperture size: 72mm
- Focal length: 400mm
- Focal ratio: f/5.6
- Objective lens: Quintuplet dual ED air-spaced APO
- Format specifications: 44mm
- Aperture blades: 17 pieces
- Graded Aperture: f/5.6-f/22
- Closest Focus Distance: 5m
- Focusing mode: Manual focus
- Filter Diameter: M82
- Total length: 370mm (inclulding dew shield); 420mm (without dew shield)
- OTA weight: 2.68kg
- Total weight (including handle & dovetail plate): 3.18kg
- Rear-end adapter: M72/M54/M48(with M48×0.75 filter thread)
- Support 50-60mm range (Recommended connection length is 55mm)
- Standard package items: 1.25inch/2inch adapter, a manual
| Product Banner Type | new |
|---|---|
| Free Shipping Graphic | Free Contiguous US Shipping |
| Telescope Focal Length | 301 - 400mm |
| Hide Found a better Shipped Price on Frontend? | No |
Askar FRA400C - High Quality Multi-functional Astrograph
The refreshed, budget-friendly iteration of the FRA400 is suitable for astrophotography, daily photography, and visual observation
Quintuplet ED Refractor
The FRA400C features a 72mm aperture, 400mm focal length, and a focal ratio of f/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 the FRA400C is the same as that of the FRA400, which is also designed with a Petzval-like optical design, 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.
Versatile Applications
The FRA400C is mechanically optimized for different applications. You can use it for astrophotography, daily photogoraphy, and visual observation.
Retractable Lens Hood
The FRA400C is equipped with a retractable lens hood and an engraved nameplate ring.
Adjustable Aperture
The aperature ranges of the FRA400C is from f/22 to f/5.6, with marked scales on the tube for step-based adjustments to prevent accidental changes and preserve settings.
Integrated Helical Focuser
One-speed helical focuser with a locking screw for easy use, it uses MXL-type synchronous gears, compatible with MXL timing-belt for electronic focusers (note that the gear and timing belts are not included; please see the photos above showing the specifications of the gear and belts for various popular focusers). The focus adjuster is an adjustable damping structure, which can increase the damping of the focus adjuster and make it more stable for astrophotography. In daily photography, it can help increase focus speed.
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 incorporates 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.
Four-Piece Photographic Adapter
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 2" and 1.25" eyepiece adapters for visual observation.
Optional Full-Frame Reducer
The optional 0.7x FRA400C reducer shortens the total focal length to 280mm, and the focal ratio to f/3.9, it supports a 44mm full-frame image circle. Note: Not compatible with the FRA400.
Specifications
- Aperture size: 72mm
- Focal length: 400mm
- Focal ratio: f/5.6
- Objective lens: Quintuplet dual ED air-spaced APO
- Format specifications: 44mm
- Aperture blades: 17 pieces
- Graded Aperture: f/5.6-f/22
- Closest Focus Distance: 5m
- Focusing mode: Manual focus
- Filter Diameter: M82
- Total length: 370mm (inclulding dew shield); 420mm (without dew shield)
- OTA weight: 2.68kg
- Total weight (including handle & dovetail plate): 3.18kg
- Rear-end adapter: M72/M54/M48(with M48×0.75 filter thread)
- Support 50-60mm range (Recommended connection length is 55mm)
- Standard package items: 1.25inch/2inch adapter, a manual
| Product Banner Type | new |
|---|---|
| Free Shipping Graphic | Free Contiguous US Shipping |
| Telescope Focal Length | 301 - 400mm |
| Hide Found a better Shipped Price on Frontend? | No |
Askar FRA400C 72mm f/5.6 Quintuplet Petzval Flat-Field Astrograph # FRA400C