CHF 229.00
Available by special order — estimated delivery time: 10 business days
Visit Askar 131F 0.74× Reducer is a focal reducer specially designed for telescopes. Askar 131F Flat-Field. This premium accessory transforms the instrument into a faster, more versatile astrophotography platform, by reducing the focal ratio of f/7.5 to f/5.6.
Thanks to this reduction in focal length, the exposure time required is greatly reduced, improving the efficiency of imaging sessions while extending the photographic field.
The reducer also incorporates optimized field correction to preserve fine, even stars across the entire surface of modern Full Frame sensors.
When installed on the Askar 131F, this reducer reduces the focal length from :
This transformation brings several major benefits:
The gain in speed is particularly interesting for imaging:
The reducer doesn't just reduce the focal length. It also incorporates a field correction system to effectively eliminate field curvature.
The result is excellent star quality:
This advanced correction makes it possible to exploit modern high-resolution cameras to the full without any significant degradation of peripheral stars.
Askar 131F 0.74× Reducer is based on an optical formula with three lenses carefully optimized for the Askar 131F scope.
This design ensures :
The supported image circle reaches 44 mm, perfectly suited to modern full-format sensors.
The gearbox adopts a standard backfocus of 55 mm measured from M48 male thread.
This standard distance makes integration with :
The package also includes :
The rear adapter directly incorporates a 2" M48x0.75 filter thread for easy installation of astronomical filters.
Like all Askar top-of-the-range accessories, this gearbox benefits from precision CNC manufacturing to ensure :
The gearbox is supplied with threaded metal plugs at the front and rear to protect optical surfaces during transport and storage.
The gearbox has been specifically developed to work with the Askar 131F to guarantee :
M72x1 threads on both sides ensure a solid, precise connection to the scope and imaging accessories.
| Features | Value |
|---|---|
| Compatibility | Askar 131F Flat-Field |
| Reduction factor | 0.74× |
| Resulting focus | 733.6 mm |
| Resulting focal ratio | f/5.6 |
| Optical type | Triplet corrector/reducer |
| Image circle | 44 mm Full Frame |
| Backfocus | 55 mm from M48 male thread |
| Main thread | M72x1 |
| Adapters included | M54x0.75 and M48x0.75 |
| Filter compatibility | Integrated 2″ M48 filter thread |
| Weight | 0.56 kg |
| Manufacturing | High-precision CNC aluminum |
The Askar 131F 0.74× Reducer is the ideal accessory for astrophotographers who want to exploit the full potential of their Askar 131F.
By transforming the telescope into a fast astrograph at f/5.6, while retaining excellent Full Frame correction, this reducer makes for greater efficiency, photographic field of view and ease of use.
Its advanced optical design, premium mechanics and perfect compatibility with the 131F make it a must-have accessory for demanding deep-sky imaging enthusiasts.
