BAADER OD 3.8 PHOTOGRAPHIC SOLAR FILTER Aperture:140mm a typical quartz can have

a typical quartz can have an error of tens of parts per million (ppm)

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

The secondary mirror can be motorized for focusing

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

ST4 Back focus 12

BAADER OD 3.8 PHOTOGRAPHIC SOLAR FILTER Aperture:140mm a typical quartz can haveWARNING: 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