TS Optics 2" Neutral Density (Gray) Filter ND 0.9 - 12.5% transmission
This neutral density filter or gray filter reduces the brightness to 1/8 without colouring the image, preventing over-radiation effects at moon and planets. The filter is also helpful for observing double stars with one particularly bright component.
The filter is suitable for daytime observing, too, as the attenuation increases the perception of fine details. Through the high absorption of ND09, a strong brightness reduction is achieved.
For solar observation, an additional solar filter in front of the lens has to be used. The filter effect of all common neutral density filters is far too weak, leading to serious eye damage.
Particularly in daytime photography or solar photography (only with front solar filter), an attenuation is often desired. Even the shortest exposure time of the camera makes the image to appear too bright. With certain DSLR cameras, the shutter can be seen as shadow at the edge of the image. By using the grey filter, the exposure time is extended and the effect is prevented.
The filter is simply screwed into the 2" filter thread of the eyepiece or the adapter. With a suitable adapter, the filter can also be mounted in front of a camera lens.
By using the threads on both sides, you can combine the gray filter with 2" colour filters, so you can achieve contrast enhancement and brightness attenuation.
You can also screw two gray filters together for increasing the damping effect.
2" Gray filter
Protective plastic box
Reduces the brightness to 12.5% - ideal for lunar and planetary observations.