BAADER OD 3.8 PHOTOGRAPHIC SOLAR FILTER Aperture:140mm Optical design Ritchey-Chrétien Diameter 304

Optical design Ritchey-Chrétien Diameter 304 mm Focal length 2432 mm Focal ratio f/8 Linear obstruction 150 mm Corrected field 30 mm (65 mm with optional corrector) Backfocus distance 288 mm from rear cell Weight 25 kg Tube outer diameter 439 mm Tube length 864 mm without focuser SKU GSRC12A+ESATTO3

Fused silica (quartz)

The transmission efficiency of the three longpass filters (yellow

AZ2000 HPS Mount –  with precision absolute axis-encoders

The flange and saddle are CNC machined and the precision of their geometry guarantees a perfect match with Vixen and Losmandy style dovetail bars

BAADER OD 3.8 PHOTOGRAPHIC SOLAR FILTER Aperture:140mm Optical design Ritchey-Chrétien Diameter 304WARNING: The OD 3. 8 Photographic filters are to be used ONLY for imaging as they pass much more light than the OD 5 filters, enough to cause permanent eye damage. Baader AstroSolar Photographic Filters are diffraction limited solar neutral density filters mounted in a temperature compensated cell. This makes them extremely safe and protected against the normal stresses typical solar films are put under, as well as retaining the excellent optical