Askar Full Frame 1.0x Flattener for 103 APO

Product code: ASKAR-FLAT103APO
in stock
£198.00 UK Price
£165.00 (ex. VAT) International Price
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Product information

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.


1x Flattener Parameter

(After attaching)103APO Focal length


(After attaching)103APO Focal ratio


Lens Number

Triplet design

Back Focus

55mm(from the base of M48 male thread)



Rear-end thread type

M54×0.75-M48×0.75(M48×0.75 filter thread inside)

1x Flattener Size Diagram

1x Flattener Installation

Spot Diagram

Product Info

Product Code ASKAR-FLAT103APO
Delivery Weight Package