EXPLORE SCIENTIFIC Dark-Sky Filter 77mm Slim Universal Dark-Sky Filter
with 77mm thread for photo lens
. Contrast enhancing filter for Aurora- and Deep-Sky imaging
Especially during Aurora imaging
the most important wavelength of 550nm (green) and 630nm (red) this filter let pass by 90%
In comparrision to CLS filters, the Explore Scientific Dark-Sky Filter
is blocking also the yellow Sodium (Na) wave at 590nm
which elliminates Sodium-lamp street illumination
from your picture.
This is very useful because the yellow light is always a partially mix of green and red light
. Removing the yellow wave-length with any image processing software will always damping also the green and red coloring. For Aurory imaging this is of course not wanted.
At these days of increasing light pollution
, the Explore Scientific Dark-Sky Filter
is absolutely recommended in order to take pictures also from urban conditions
Finally the slim housing design
enables its use also with wide-field photo lens
and doesn´t cause any vignetting.