Daystar Filters Energy Rejection Filters ERF 100/150 mm
619.00
Tax included 
Usually available from the supplier. Please contact us for more information.
Available payment methods
i
PayPal
Secure payment. Additional fees may apply.
PayPal
i
Bank transfer
Pay comfortably from home. After confirming your order, you will receive all the information required to make a bank transfer.
Bank transfer
i
Pay in store
Pay directly in our shop in Givisiez, in cash or by card. Your order can be collected after confirmation.
Pay in store
i
PimPay
A payment system with no fees. Simply top up your PimPay account before completing your purchase. No fees are charged to either the buyer or the merchant.
PimPay
i
HeyLight
Credit for up to 12 months or payment in 3 instalments. For payment in 3 instalments, the displayed price includes a 3.74% surcharge applied by Astromanie to cover the service fees associated with this payment method.
HeyLight
Daystar Filters Energy Rejection Filters 100/150 mm
Daystar Energy Rejection Filters reduce thermal load by blocking UV and IR while transmitting visible light. The 100/150 mm model fits refractor tubes up to 150 mm in outside diameter for optimal performance with Daystar solar filters.
Daystar Filters Energy Rejection Filters 100/150 mm
Description
Daystar Energy Rejection Filters (ERF) are designed to significantly reduce the amount of heat entering the optical system during solar observation. They block ultraviolet and infrared radiation while allowing the useful portion of the visible spectrum to pass. Depending on the version, the ERF may be made of colored glass or dielectric-coated glass for efficient UV and IR suppression.
In addition to thermal reduction, ERFs act as aperture masks to ensure the correct angle of incidence required for Daystar filters, which perform best at f/30 or slower. This configuration can be achieved by reducing the effective aperture or using a suitable Barlow lens.
The correct reduced aperture is calculated by dividing the telescope focal length by 30. When using a Barlow lens, the adjusted focal length must be considered. The 100/150 mm model includes a 100 mm ERF glass mounted in a front cell designed for refractor tubes up to 150 mm in outside diameter.
This ERF ensures stable thermal management, maintains optical consistency during long solar sessions, and optimizes performance with Daystar H-alpha filters. It is an essential accessory for safe and efficient solar observation across a wide range of refractors.
Technical specifications
UV/IR thermal reduction
Visible spectrum transmission
Colored or dielectric-coated glass
Aperture mask functionality
Recommended focal ratio: f/30 or slower
Compatible with Barlow lenses
Aperture calculation: focal length ÷ 30
ERF glass diameter: 100 mm
Mounting cell fits tubes up to 150 mm OD
Suitable for many refractors
Optimized for Daystar solar filters
Enhanced optical and thermal stability
H-alpha compatible depending on filter used
ERF DS Filters 100/150 E-150N100
Daystar Filters Energy Rejection Filters 100/150 mm
Daystar Energy Rejection Filters reduce thermal load by blocking UV and IR while transmitting visible light. The 100/150 mm model fits refractor tubes up to 150 mm in outside diameter for optimal performance with Daystar solar filters.