Περιγραφή
Product description
Player One S series filter using high quality optical glass substrate
and multi-layer composite coating technology, which has excellent
optical performance in astrophotography.
2 inch ERF filter ( Energy rejection filter for Quark Chromosphere）
This filter is an assistant filter, design for Quark Chromosphere (Ha verstion) , intend to reject energy and extend life time of your Quark.
2″ ERF filter must be used on 6″ or smaller refractors only, larger aperture will cause damage!
(DO NOT use it on eyespiece for observing)
Why add a ERF on Quark?
First filter on Quark is quite small, the solar disk might bigger
than it, the light will heat the filter and it’s holder. With this 2″
ERF filter, we can protect both the filter and filter holder from high
temperature.
And don’t worry about the ERF itself, it’s use B270 transparent glass and multi coating, it will reflect not absorb most energy.
Does it has any other usage?
Yes, this ERF filter also can be used in Lunar imaging, it will
provide even brighter image than IR685 filter, also could improving the
seeing.
