The QHY 020089 Spacer Set is a set of five fine adjustment spacer rings (optical thickness of 0.5mm, 1mm, 2mm, 3mm, 4mm, 7mm) and a 4mm M54 female camera adapter.
The Skyliner-250P Classic 10” Parabolic Dobsonian telescope offers an incredible aperture-to-price ratio. The Dobsonian mount, popularized by John Dobson in the 1970s, is a simple and efficient method of mounting a Newtonian reflector. Fast and easy to set up, the Dobsonian mount consists of a box-type mounting which allows the telescope to pivot in altitude, while the box itself is rotated on a base in azimuth.