The 1.0x flattener does not change the telescope's focal ratio itself. After connecting with the Askar 185APO, 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 0.79kg. 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.

Specifications
1x Flattener Parameter
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?After attaching?140APO Focal length
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1295mm
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?After attaching?140APO Focal ratio
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f/7
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Lens Number
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Triplet design
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Back Focus
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55mm?from the base of M48 male thread?
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Weight
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0.74kg
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Rear-end thread type
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M68×1 M54×0.75 M54×0.75-M48×0.75(M48×0.75 filter thread inside)
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1x Flattener Size Diagram
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1x Flattener Installation

Spot Diagram
