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The Askar 140 APO comes with three optional premium accessories, a 1.0x flattener and a 0.8x reducer. Introduced here is the 1.0x flattener， which is optimized for the Askar 140APO， and can provide more possibilities for telescope use.
The 1.0x flattener does not change the telescope's focal ratio itself. After connecting with the Askar 140APO, it still maintained a focal ratio of 7. 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 0.75kg. The back focus from the M48 thread is a standard 55mm. The front thread is M92*1. At the camera end, it is equipped with M68*1, M54*0.75 and M48*0.75 three 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.
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1x Flattener Parameter |
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（After attaching）140APO Focal length |
980mm |
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（After attaching）140APO Focal ratio |
f/7 |
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Lens Number |
Triplet design |
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Back Focus |
55mm（from the base of M48 male thread） |
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Weight |
0.79kg |
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Rear-end thread type |
M68×1 |
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1x Flattener Size Diagram |
Drew Evans | NGC1499 California Nebula | Askar 140APO+140APO 1x Full-frame Flattener+ZWO ASI6200MM Pro
Drew Evans | Theta Tauri | Askar 140APO+140APO 1x Full-frame Flattener+ZWO ASI2400MC
Drew Evans | Caldwell 14 Double Cluster | Askar 140APO+140APO 1x Full-frame Flattener+ZWO ASI2400MC
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