(1 review)

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in stock

Baader D-ERF 160mm Energy Rejection Filter - Solar Observation

836,13 EUR
excl. VAT
excl. 4,95 € Shipping costs

Baader D-ERF D=90mm - Energy rejection filter for solar observation - thermal reduction # 2459245D

... prevents heat from entering the telescope

Baader D-ERF Engery reflection filter

The "cool" D-ERF filters by Baader are unique - and made in Germany! DThe filter glass is, in opposite to other makes, plane-parallel polished with a precision of 1/10 λ. The have an effective infrared reflective coating protecting the tube's internal parts from heat. Tube seeing is reduces and expensive filters near the focus are protrected from thermal stress. This is a prerequisite to use H-α narrow band filters.

The D-ERF filters are the successors of Baader's C-ERF filters.

The Baader D-ERF main advantages:

-- High quality plane-parallel polished substrate with a surface precision of 1/10 λ.
-- Dielectric interference layer coating system for IR reflection
-- Multi-layer anti-reflective coatings to prevent reflections
-- Stress-relieved substrate

Technical detail:

Baader D-ERF filter curve
-- Diameter: 160mm
-- IR and UV reflecting
-- Dielectrical coatings

Mounting to the tube:

ERF cell

We also offer cells to mount the filter to the optical tube. The price is depending on the filter diameter. The cell is not included in the filter's price.

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Customer reviews:

Author: Ivan Vasilev, 11.10.2016
Evaluation: TEXT_OF_5_STARS

"High quality product!"


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