

The Hong Kong based company Cyclops Optics is selling light pollution filters for Nikon full frame cameras. The filter can be “clipped-on” on top of the sensor in order to block light pollution for astrophotography.

Update #1: This clip filter was made by STC and not by Cyclops Optics. Cyclops Optics is one of the resellers in Hong Kong. STC is a Taiwanese company and their website can be found here. Some tests can be found here.
Update #2 from a reader: the clip filter is actually inserted during sensor cleaning mode. The mirror flips up and it sets almost level with the electric contacts. The filter bracket holds the mirror up after cleaning mode is disabled allowing for live view mode only. This solution works well with the D810 and D810, but not with the D610.
A new STC MS Clip filter V2.0 is coming soon: the new version will not require the mirror to be locked up and thus should work with D610 and other models.
Additional information from the product listing on their website:






















