CHF 229
In stock with supplier
Visit Askar 111F 0.74× Reducer is a focal reducer specially optimized for telescopes. Askar 111F Flat-Field. This accessory transforms the astrograph into a faster, more versatile system, perfectly suited to wide-field deep-sky astrophotography.
Thanks to its 0.74×, the telescope from f/6.9 to f/5.1, This is achieved by integrating advanced field correction to obtain fine, homogeneous stars even in the corners of Full Frame sensors.
The gain in luminosity and photographic field of view significantly reduces exposure times, while facilitating the imaging of extended deep-sky objects.
Once installed on the Askar 111F, the reducer reduces the native focal length:
This transformation brings several major benefits:
The reducer is particularly useful for photography:
The Askar 111F 0.74× Reducer doesn't just shorten the focal length. It also incorporates advanced field correction to effectively eliminate field curvature.
This correction guarantees :
The supported image circle reaches 44 mm, perfectly suited to modern 24×36 sensors.
The reducer is based on an optical formula with three lenses specially designed to work with Askar 111F.
This design ensures :
The whole system has been designed to preserve the scope's native image quality while increasing its photographic speed.
The Askar 111F 0.74× Reducer adopts a standard backfocus of 55 mm measured from M48 male thread.
This standard distance facilitates integration with most modern astrophotographic equipment:
The 111F photographic extension tube includes :
This makes installation particularly quick and easy.
The reducer's rear adapter incorporates a standard thread M48x0.75 for direct mounting of 2" astronomical filters.
This compatibility facilitates the use of :
Like other Askar high-end accessories, the 111F 0.74× Reducer benefits from precision CNC manufacturing ensuring :
The gearbox is supplied with front and rear threaded metal plugs to protect the optical surfaces from dust and moisture during storage.
The gearbox uses M68x1 on both sides to ensure :
This approach is particularly important for modern Full Frame setups requiring excellent mechanical precision.
| Features | Value |
|---|---|
| Compatibility | Askar 111F Flat-Field |
| Reduction factor | 0.74× |
| Resulting focus | 566 mm |
| Resulting focal ratio | f/5.1 |
| Optical type | Triplet corrector/reducer |
| Image circle | 44 mm Full Frame |
| Backfocus | 55 mm from M48 male thread |
| Main thread | M68x1 |
| Adapters included | M54x0.75 and M48x0.75 |
| Filter compatibility | Integrated 2″ M48 filter thread |
| Weight | 0.5 kg |
| Manufacturing | High-precision CNC aluminum |
The Askar 111F 0.74× Reducer is an excellent complement for astrophotographers wishing to exploit the full potential of their Askar 111F.
By transforming the refractor into a fast astrograph at f/5.1 while retaining excellent Full Frame correction, this reducer significantly improves the instrument's photographic efficiency and versatility.
Its advanced optical design, robust mechanics and perfectly optimized compatibility with the 111F make it a particularly coherent accessory for demanding deep-sky enthusiasts.
