Used Baader O-III Nebula Visual Filter (10nm), 2" Pier Extension the highspeed version is the

the highspeed version is the best choice

Conditions:

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

50mm achromatic objective lens with adjustable focus

Used Baader O-III Nebula Visual Filter (10nm), 2" Pier Extension the highspeed version is theCondition: 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