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DayStar Filters - Energy Rejection Filter - 150mm Glass, Cell and Cap

  • DayStar Filters - Energy Rejection Filter - 150mm Glass, Cell and Cap
Price:
$449.00
Condition:
New
Quantity:
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Product Description

The DayStar Energy Rejection Filters come in handy when the observer needs to reduce heat load on the filters by absorbing UV wavelengths. These types of filters are usually known as dielectric IR and UV and also can be used as aperture masks to accomplish straight angles of light entering the filter. At a focal ratio of f/30 or slower is where DayStar filter assemblies perform best. To create an f/30, the observer needs the correct ERF filter and barlow. Higher resolution, larger aperture configurations use a barlow.

In the order notes, please specify the telescope this ERF is to be used with, and measure (with a ruler) the outside (largest) diameter of your telescope's dew shield at the very front of the telescope.  ERFs are custom machined on a  one-off basis and so the accuracy of this measurement is very important.  Failing to provide this measurement will cause your order to be put on hold until it is provided.

Name DayStar Filters - Energy Rejection Filter - 150mm Glass, Cell and Cap
Manufacturer DayStar Filters
Model DAY-ERF-150

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