Energy Rejection:
Concentrated sunlight can create ve ry high tem peratures where i t falls,
so care must be taken to prevent melted components or fire.
For brief observing sessio ns with le ss than 80m m of apertu re when not
using a tracking mount, it can be OK to use no energy rejection at all. Be
alert for any rise in temperature of your telescope, diagonal, or Quark.
For tele scopes un der approximately 120mm of
aperture, a scre w in UV /IR cut filter can be
employed in front of the telescope diagonal. The
UV/IR cut filter reflects UV and IR light back out
the front of the telescope, reducing temperatures
inside. Do not use a UV/IR cut filter with oil
spaced o bjective tele scopes, or any telescope
with an integrated rear field flattener or Petzval lens. The UV/IR cut filter
must be the first optical element to receive concentrated light.
For b est pe rformance, a red o r
yellow gla ss front mount Energy
Rejection Fil ter sh ould b e use d.
This prevents almost all heat from
entering the telescope, an d is the
safest opti on. Mo
dels are
available fo r up to 1 0 i nches of
aperture an d are cu stom built for
each DayStar filter owner. Please
measure the outside di ameter of
the front of your tele scope’s d ew
shield. T his tube OD measurement is critical to e nsuring a good fit for
your ERF.
Please note, a Herschel Wedge or white light filter
cannot
be used with
the Quark. These filters pass very little light by design and so will result
in an extremely dark image if used with the Quark.
