Correction of horizontal astigmatism in an anamorphic lens

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Hello,

I need advice which lens should I use for correction of horizontal astigmatism in anamorphics lens which contains two prisms.
Focal length which I need to be focused is about 3 meters.
I am using this prisms pair with projector. When I display grid horizontal lines are not focused, because pair of prisms cannot focus both planes together. See attachment - it is not visible but in personal yes.
I read that correction can be done by bended glass plate but I am not sure how to calculate curvature.

Thank you for help
 

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