Astronomy Specialist

DAYSTAR OFF-AXIS ENERGY REJECTION FILTER FOR SCT

$999.00 AUD
SKU: DS-E-244F63
0

Daystar


Size

 

DayStar Off-Axis SCT Energy Rejection Filters reduce the heat load on your filter assembly by absorbing or reflecting UV and/or I light and transmitting light in the desired visual spectrum. These filters are sometimes Red or Yellow glass, or dielectric IR and UV, but pass light in the desired visual spectrum. The ERF can also serve as an aperture mask to accomplish a straight angle of incidence for light entering the filter.


DayStar filter assemblies operate best at f/30 and slower. Creating f/30 configuration can be done easily with the proper ERF and/or barlow.

In order to find the right ERF for your system, measure (with a ruler) the outside (largest) diameter of your telescope tube at the very front of the telescope. 

 

63 mm ERF for SCT Ø 244 mm
DS-E-244F63
80 mm ERF for SCT Ø 281 mm DS-E-281F80
80 mm ERF for SCT Ø 311 mm DS-E-311F80
90 mm ERF for SCT Ø 325 mm DS-E-325F90
100 mm ERF for SCT Ø 356 mm DS-E-356F100
115 mm ERF for SCT Ø 410 mm DS-E-410F115
125 mm ERF for SCT Ø 460 mm DS-E-460F125
0