Astrozap Bahtinov focus mask for ETX 90 90mm-100mm (15156)
157.33 $
Tax included
The Astrozap focusing cap is a versatile and multi-purpose tool designed for astrophotographers and visual observers. Unlike simple Hartman or Bahtinov masks, it offers a convenient "shutter-like" operation. The wheel can be turned to the open position for precise focusing and then closed to protect the telescope from dust or to capture dark frames with a CCD or DSLR camera. Its lightweight aluminum construction and powder-coated black finish ensure durability and ease of use.