Energy Rejection Filters
Category: Solar Filters
All sales of solar gear are final, so please choose your filter carefully and reach out with any questions.
Description
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 as listed below.
Higher resolution, larger aperture configurations use a barlow.
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In order to compute the proper aperture reduction mask, divide your telescope EFL or Focal Length by 30. To compute the proper aperture using a barlow, use the adjusted EFL which includes multiplication by your barlow.
| Application | SKU # | Specification | Price |
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Energy Rejection-Refractor |
DSIUV2 | Daystar 2" UV/IR Filter - For refractor | $125.00 |
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Energy Rejection-Refractor |
E-100N75 | 75mm ERF Glass, Cell & 100mm ID Cap - For refractor | $402.00 |
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Energy Rejection-Refractor |
E-110N75 | 75mm ERF Glass, Cell & 110mm ID Cap - For refractor | $402.00 |
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Energy Rejection-Refractor |
E-110N80 | 80mm ERF Glass, Cell & 110mm ID Cap - For refractor | $460.00 |
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Energy Rejection-Refractor |
E-120N80 | 80mm ERF Glass, Cell & 120mm ID Cap - For refractor | $460.00 |
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Energy Rejection-Refractor |
E-120N100 | 100mm ERF Glass, Cell & 120mm ID Cap - For refractor | $580.00 |
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Energy Rejection-Refractor |
E-130N100 | 100mm ERF Glass, Cell & 130mm ID Cap - For refractor | $580.00 |
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Energy Rejection-Refractor |
E-140N100 | 100mm ERF Glass, Cell & 140mm ID Cap - For refractor | $580.00 |
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Energy Rejection-Refractor |
E-150N100 | 100mm ERF Glass, Cell & 150mm ID Cap - For refractor | $580.00 |
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Energy Rejection-Refractor |
E-150N130 | 130mm ERF Glass, Cell & 150mm ID Cap - For refractor | $862.00 |
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Energy Rejection-Refractor |
E-160N130 | 130mm ERF Glass, Cell & 160mm ID Cap - For refractor | $862.00 |
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Energy Rejection-Refractor |
E-170N130 | 130mm ERF Glass, Cell & 170mm ID Cap - For refractor | $862.00 |
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Energy Rejection-Refractor |
E-170N140 | 140mm ERF Glass, Cell & 170mm ID Cap - For refractor | $1,055.00 |
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Energy Rejection-Refractor |
E-180N130 | 130mm ERF Glass, Cell 180mm ID Cap - For refractor | $1,055.00 |
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Energy Rejection-Refractor |
E-180N150 | 150mm ERF Glass, Cell & 180mm ID Cap - For refractor | $1,175.00 |
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Energy Rejection-Refractor |
E-190N130 | 130mm ERF Glass, Cell & 190mm ID Cap - For refractor | $875.00 |
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Energy Rejection-Refractor |
E-190N150 | 150mm ERF Glass, Cell & 190mm ID Cap - For refractor | $1,175.00 |
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Energy Rejection-Refractor |
E-200N140 | 140mm ERF Glass, Cell & 200mm ID Cap - For refractor | $1,035.00 |
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Energy Rejection-Refractor |
E-200N150 | 150mm ERF Glass, Cell & 200mm ID Cap - For refractor | $1,175.00 |
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Energy Rejection-Refractor |
E-210N150 | 150mm ERF Glass, Cell & 210mm ID Cap - For refractor | $1,175.00 |
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Energy Rejection-Refractor |
E-220N150 | 150mm ERF Glass, Cell & 220mm ID Cap - For refractor | $1,175.00 |
| Energy Rejection - SCT 8" | E-244F63 | 63mm ERF Glass, Cell & 244mm ID Cap - off-axis for SCT | $402.00 |
| Energy Rejection - SCT 9.25" | E-281F80 | 80mm ERF Glass, Cell & 281mm ID Cap - off-axis for SCT | $460.00 |
| Energy Rejection - SCT 10" | E-311F80 | 80mm ERF Glass, Cell & 311mm ID Cap - off-axis for SCT | $460.00 |
| Energy Rejection - SCT 11" | E-325F90 | 90mm ERF Glass, Cell & 311mm ID Cap - off-axis for SCT | $518.00 |
| Energy Rejection - SCT 12" | E-356F100 | 100mm ERF Glass, Cell & 356mm ID Cap - off-axis for SCT | $633.00 |
| Energy Rejection - SCT 14" | E-410F115 | 115mm ERF Glass, Cell & 410mm ID Cap - off-axis for SCT | $690.00 |
| Energy Rejection - SCT 16" | E-460F125 | 125mm ERF Glass, Cell & 460mm ID Cap - off-axis for SCT | $875.00 |
Before you pay
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When it ships
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Standard Shipping: Handling (business days) 0–1; Transit (business days) 7–15.
Express Shipping: Handling (business days) 0–1; Transit (business days) 7–15.
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Standard Shipping · United States: $0.00
Express Shipping · United States: $3.99
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United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.
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