Askar - 1.0x Flattener for 140APO Refractor
In contrast to the Askar Reducers, the 1x Flattener designed for the Askar 140APO telescope maintains its original f/7 focal ratio. Its primary function is to correct field curvature and coma problems that can lead to optical distortions in imaging, especially becoming more apparent during longer exposure times.
Askar 1.0x Flattener for 140APO Refractor
Askar 1x 140APO Flattener
Unlike the Askar Reducers, the 1x Flattener for the Askar 140APO retains the native f/7 focal ratio, but simply resolves the field curvature and coma issue which can cause optical distortions when imaging, particularly the more noticeable the longer exposures are.
The 1.0x flattener implements a triplet configuration and generates a 44mm image circle, enough for full frame imaging. From the M48 thread, the 55mm backfocus is standard and is adequate for most imaging setups. The front thread is M48x1 while the camera end has an M68x1, M54x0.75 and M48x0.75 adapters.
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- Askar 1.0x Flattener for 140APO Refractor