Baader 2" Filter Crown Tool

Suitable for all Baader 2" filters mounted with low profile filter cell (LPFC) - fit is not guaranteed for older filters. Not suitable for other manufacturers' filters without grip crown or with unknown mounting diameters.


Included with Baader 2" Cool-Ceramic Safety Herschel Prism Mark II - (Visual / Photo) (various versions available) .


This tool was originally developed for the Baader Herschel prism to facilitate replacement of installed filters.


Baader 2" Filter Crown Tool


This tool is used to unscrew hard-to-reach 2" filters. It was originally developed for the Baader 2" Cool-Ceramic Safety Herschel Prism Mark II - (Visual / Photo) (various versions available) to facilitate replacement of installed filters and is designed for all current Baader 2" filters with low profile mounts - fit is not guaranteed with older filters.


Modern filter cells are very thin walled to provide the largest possible clear aperture for the actual filter. If a filter is very tight and difficult to access (e.g., in a filter changer or in the rotation mechanism of a Herschel wedge), it can easily deform if you grab it and turn it with only two fingers. Deformation of the filter housing can cause it to clog even more than before. With this 2" filter crown tool, the pressure is distributed over a large surface area so that it cannot deform, as if you were gripping the entire filter housing with your hand. This gives you a much better grip for turning it out - and you don't have to worry about accidentally leaving fingerprints on the filter surface.


The new Filter Crown Tool is designed specifically for all modern Baader 2" mounted filters. This is due to the unique design of our filter cells, which feature a precision milled "filter crown". The filter crown tool interacts with this special notch and is only effective if used correctly. Due to these features, the tool is not compatible with filters from other manufacturers.


This crown wrench is manufactured by 3D printing.