Ha SII OIII 7nm narrowband 2″ Filter S-series

Player One S series filter using high quality optical glass substrate and multi-layer composite coating technology, which has excellent optical performance in astrophotography. Ha SII OIII 7nm narrowband 2″ filter In astrophotography, narrowband filters can capture specific wavelengths to obtain specific details. Usually there are three narrowband filters, respectively, Ha SII OIII filters, Player One produced narrowband filters with excellent transmittance, cutoff rate and halo control.   Technical Data FWHM：7nm±0.5nm Glass Thickness: 2.0 /-0.03 mm  (1.25”/2″) Transmittance：About 90% Surface accuracy: 1/4 lambda (both side) Blocking depth: OD3(<0.1% transmission of off-band) NIR cutoff: 700nm-1100nm Frame threads: M48*0.75 (2″ filter) Frame thickness: body 5mm thread 2.5mm, a total of 7.5mm