Lunt Solar 1.25" Rack & Pinion FocuserIntroducing the New 1. 25" Rack & Pinion Focuser from Lunt Solar Focusing mechanisms represent a critical interface between primary optical systems and observation equipment in telescopic applications. While helical focusers have historically been employed in entry level and solar telescope systems, their inherent mechanical limitations significantly compromise optical performance. Common deficiencies in helical focuser design include excessive