Used Baader O-III Nebula Visual Filter (10nm), 2" Pier Extension 50mm achromatic objective lens with

50mm achromatic objective lens with adjustable focus

M54 Camera Adapter

which provide high contrast viewing while minimizing chromatic aberration

75 filter thread) Standard package items  A 131F OTA，a pair of tube rings

Used Baader O-III Nebula Visual Filter (10nm), 2" Pier Extension 50mm achromatic objective lens withCondition: This is a used Baader O III 10nm visual filter in very good condition with mostly clean optics. There is some minor spotting; see the photos. It comes in its original jewel case. Description: Quick Overview Baader 2 OIII filter improves contrast of nebulae for visual observation and imaging 10nm passband includes OIII (501nm) and H Beta (486nm) wavelengths emitted by diffuse and planetary nebulae and supernova remnants Superior fine optical