1. The apochromatic barlow lens provide a high power magnification allow you look more closely and more detailed at the moon's surface and other planet.
2. 3 element APO with multi coated optics design offer a high quality observation without additional additional chromatic aberration; make image more crisp and sharp.
3. Quality aluminum stock and black anodized body with M42x0.75mm thread; work as a t adapter; connect DSLR or SLR camera to telescope travel via a separate ring adapter.