Dark Clear Skies 1.25″ CLS Filter Deep sky eyepiece Optical Length: The optical length

Optical Length: The optical length is 99mm with the 2″ barrel

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Sequence Generator Pro

Support Filters: The 2' drawer features M48*0

Dark Clear Skies 1.25″ CLS Filter Deep sky eyepiece Optical Length: The optical lengthThe Dark Clear Skies 1. 25 CLS (City Light Suppression) Filter is designed to reduce the effects of artificial light pollution while maintaining good transmission of natural starlight and broadband astronomical targets. Purpose & Use CLS filters are broadband light pollution filters intended to suppress common wavelengths produced by street lighting while preserving much of the visible spectrum. This helps improve contrast and background sky darkness