111F 0.74× Reducer
Category： Accessories
The Askar 0.74× reducer, specially optimized for the Askar 111F, is designed to unlock a broader and more efficient deep-sky astrophotography experience.
Retail Price:
$ 299
20
In stock Back OrderedUpon package arrival, expect to pay customs duties and VAT to customs
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Retail Price:
¥ 55542
库存剩余
465465123
Upon package arrival, expect to pay customs duties and VAT to customs.
- Product introduction
- Product introduction
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- Commodity name: 111F 0.74× Reducer
- Commodity ID: 111F 0.74× Reducer
The Askar 0.74× reducer, specially optimized for the Askar 111F, is designed to unlock a broader and more efficient deep-sky astrophotography experience.
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The 0.74× reducer brings the Askar 111F's focal ratio down to F5.1, delivering a faster optical system while incorporating built-in field-flattening correction to effectively eliminate field curvature - ensuring sharp and clear stars from the center to the very edges of the frame. The shorter focal ratio provides a wider field of view and shorter exposure times, making it particularly well-suited for capturing expansive nebulae, star clusters, and faint or fast-moving celestial objects.
The Askar 111F 0.74× Reducer features a triplet optical design and supports a 44mm full-frame image circle. Its back focus is 55mm (measured from the M48 thread), and both ends feature M68×1 threads for optimal adaptability and stability.
The 111F photographic extension tube includes M54×0.75 and M48×0.75 adapters, allowing for direct and convenient connection to the 111F 0.74× reducer. The reducer’s rear adapter ring features a built-in M48×0.75 standard 2-inch filter thread, enabling direct installation of various astronomical filters to accommodate different imaging needs.
The entire reducer is precision CNC-machined and comes with front and rear metal threaded caps to protect the optics from dust when not in use.
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Parameter （After attaching）111F Focal length 566mm （After attaching）111F Focal ratio f/5.1 Lens Number Triplet design Back Focus 55mm（from the base of M48 male thread） Weight 0.5kg Rear-end thread type M68*1 Size Diagram 
Installation 
Optical Path Diagram 
Spot Diagram 
Product introduction
The 0.74× reducer brings the Askar 111F's focal ratio down to F5.1, delivering a faster optical system while incorporating built-in field-flattening correction to effectively eliminate field curvature - ensuring sharp and clear stars from the center to the very edges of the frame. The shorter focal ratio provides a wider field of view and shorter exposure times, making it particularly well-suited for capturing expansive nebulae, star clusters, and faint or fast-moving celestial objects.
The Askar 111F 0.74× Reducer features a triplet optical design and supports a 44mm full-frame image circle. Its back focus is 55mm (measured from the M48 thread), and both ends feature M68×1 threads for optimal adaptability and stability.
The 111F photographic extension tube includes M54×0.75 and M48×0.75 adapters, allowing for direct and convenient connection to the 111F 0.74× reducer. The reducer’s rear adapter ring features a built-in M48×0.75 standard 2-inch filter thread, enabling direct installation of various astronomical filters to accommodate different imaging needs.
The entire reducer is precision CNC-machined and comes with front and rear metal threaded caps to protect the optics from dust when not in use.
Specifications
| Parameter | |
| （After attaching）111F Focal length | 566mm |
| （After attaching）111F Focal ratio | f/5.1 |
| Lens Number | Triplet design |
| Back Focus | 55mm（from the base of M48 male thread） |
| Weight | 0.5kg |
| Rear-end thread type | M68*1 |
| Size Diagram |
| Installation |
| Optical Path Diagram |
| Spot Diagram |
Video
Images
Download
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