Specification of our Dove prism as follow:
*Material: BK7/Quartz
*Angles: +/-3 min
*Dimension: +/-0.15mm
*Flatness:λ/8
*Surface Quality: 20-10 scratch-dig
*Clear Aperture: 90%
Dove Prism is ideal for image rotation. Dove prisms create an image inversion in a beam input parallel to the base.China star optics can supply each kind size and each kind dimension Dove prism. The coating  or painting may be available by custom orders.