70mm Secondary flat mirror 1/12 wave (DIAGONAL) are optically flat and yield optimum performances when combined with the above astronomical mirrors. Each mirror is aluminised and overcoated.
GSO offers secondary flat telescope mirrors to match the complete telescope set request. Our elliptic flat mirror has the same high optical quality as our parabolic primary mirrors using BK7 quality glass. All of the mirror surface quality is over 1/12 wave RMS at the least, typically better.
All mirrors have an aluminium reflective coating of 93%. The aluminium coating is protected by a quartz overcoat to make the layer durable against ageing effects.