Askar 103APO Premium Reducers and Flatteners
Askar 103APO Premium Reducers and Flatteners
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Product Description
0.8x Reducer
The 0.8x reducer can bring Askar 103APO's focal ratio down to F5.4. This is a standard reducer with field flattening capabilities as well. A shorter focal ratio allows the OTA to have a wider field of view and faster exposure times, making it suitable for capturing large areas of nebulae, star clusters, and faint, fast-moving celestial objects.
The 0.8x reducer adopts a triplet design and supports a 44mm full-frame image circle. The overall weight is 0.48kg. The back focus from the M48 thread is a standard 55mm. The front thread is M84*1. At the camera end, it is equipped with M54*0.75 and M48*0.75 two sizes of adapters, which are convenient for connection. At the same time, it has a built-in M48*0.75 2-inch filter thread, which can be directly installed and used. The overall CNC machined, both end threaded metal caps prevent ash when not in use.
0.6x Reducer
The 0.6x reducer can bring the Askar 103APO's focal ratio down to F4 while also providing field flattening. Askar 103APO adopts a detachable tube design, where the rear part of the tube can be removed when using the 0.6x reducer, allowing the telescope to have the necessary length to achieve an F4 focal ratio.
The 0.6x reducer adopts a quadruplet design that also supports a 44mm full-frame image circle. The overall weight is 0.98kg. The back focus from the M48 thread is a standard 55mm. The front thread is M84*1. At the camera end, we have equipped three sizes of adapter，M68*1, M54*0.75, and M48*0.75 for easy subsequent connection and use. At the same time, the built-in M48*0.75 2-inch filter thread can be used to install filters directly. The overall CNC machined, both end threaded metal caps prevent ash when not in use.
1.0x Flattener
The 1x flattener does not change the telescope's focal ratio itself. After connecting with the Askar 103APO, it still maintained a focal length of 6.8. The flattener corrects field curvature and coma, resulting in flatter field edges and finer star points.
The 1.0x flattener adopts a triplet design and supports a 44mm full-frame image circle. The overall weight is 0.58kg. The back focus from the M48 thread is a standard 55mm. The front thread is M84*1. At the camera end, it is equipped with M54*0.75 and M48*0.75 two sizes of adapters, which are convenient for connection. At the same time, it has a built-in M48*0.75 2-inch filter thread, which can be directly installed and used. The overall CNC machined, both end threaded metal caps prevent ash when not in use.
What's in the Box
Specifications
| 0.8x Reducer | 0.6x Reducer | 1.0x Flattener | |
| 103APO Focal Length (attached) | 560.32mm | 420.24mm | 700.4mm |
| 103APO Focal Ration (attached) | f/5.44 | f/4.08 | f/6.8 |
| Lens Design | Triplet | Quadruplet | Triplet |
| Back Focus | 55mm | 55mm | 55mm |
| Weight | 0.48kg | 0.98kg | 0.58kg |
| Rear-end Thread Type | M54x0.75 M54x0.75-M48x0.75 (M48x0.75 filter thread inside) |
M68×1 M68×1-M54×0.75 M54×0.75-M48×0.75 (M48×0.75 filter thread inside) |
M54x0.75 M54x0.75-M48x0.75 (M48x0.75 filter thread inside) |
Dimension Diagrams
Installation Diagram
Spot Diagrams
