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Daystar off axis ERF energy rejection filter SCT 63 244 mm
509.00CHF
473.37CHF Save 7%
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Delivery times depending on the shipping method: Switzerland: 2 to 3 days; Europe: 7 to 10 days.
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Daystar off axis ERF energy rejection filter SCT 63 244 mm
The Daystar off-axis ERF 63/244 mm for SCT telescopes reduces heat load on solar filter assemblies by absorbing or reflecting UV and IR radiation while transmitting the required visible spectrum, protecting the optical system.
Daystar off axis ERF energy rejection filter SCT 63 244 mm
Description
The Daystar Off-Axis Energy Rejection Filter ERF for SCT telescopes is designed to reduce thermal load on solar filter assemblies. It absorbs or reflects unwanted ultraviolet and infrared radiation while allowing visible light in the required visual spectrum to pass through.
These filters may be made from red or yellow glass or use dielectric UV and IR coatings. The ERF can also act as an aperture mask, ensuring a straight angle of incidence for light entering the filter system.
Daystar filter assemblies operate best at f/30 or slower. Achieving an f/30 configuration can be done using the appropriate ERF and or a Barlow lens. To select the correct ERF, the outside diameter of the telescope tube should be measured at the very front of the telescope.
Technical specifications
Type: solar filter
Construction type: ERF pre filter
Configuration: off axis
Use: SCT telescopes
Free transmission: 63 mm
Diameter: 244 mm
Mount: lens filter
ERF DS Filters 63/244 (E-244F63)
Daystar off axis ERF energy rejection filter SCT 63 244 mm
The Daystar off-axis ERF 63/244 mm for SCT telescopes reduces heat load on solar filter assemblies by absorbing or reflecting UV and IR radiation while transmitting the required visible spectrum, protecting the optical system.