Our corporation has been in the astronomical telescope profession for many years, ASKAR is possessed of perfect technology and we have a professional R&D team. The ACL200mm F4 lens is specially designed and developed for the optimization of astronomical photography, the quality is excellent, and structure using an integrated design, which can achieve good results in correct exposure and the depth of field. When using this lens for astrophotography or scenery photography, the flat field intensity, uniformity, achromatic aberration and sharpness of image have attained a good effect, which bring amateur star gazer clear visual effects and more possibilities for photography.