Phantom Group coated.
By specifically filtering out the areas in which the color error from
Refractors is particularly dominant, this disturbing phenomenon
minimized, contrast performance and sharpness increase. The Semi Apo
Filter is suitable for all refractors that have a color error.
The effect is particularly strong with bright “large field”
Achromats, but also with ED refractors, an improvement in the
Figure be visible with bright objects.
Filter Thickness: 2mm