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Focal Reducers With Field Flatteners

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What is the image-flattening feature that some focal reducers have?

Focal Reducers With Field Flatteners

Focal reducers work by shortening the focal length of a telescope to give you a wider field of view and speeding up the focal ratios – ideal for situations where you are photographing the night sky. Some focal reducers also come with field flatteners. With a basic focal reducer, stars at the edge of field may become blurry and out of focus. Field flatteners work to reduce the curvature in the field of view, improving the sharpness of images at the edges.

   

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