Customizing A Baader Solar Filter Mount for Your Telescope

Standard Refractor Cell Mounting

Off-Axis Mounting for Reflectors and Schmidt-Cassegrain Telescopes

See a photo illustration of construction Here.

For your standard refractor, binocular, or Maksutov objective, you will center the filter material.  The collar may be made from cardboard, cardstock, or opaque flexible plastic.  The cap  material should not allow any light through either the hole around the Baader Material, or the edges where it connects to the collar.   You may need to run duct tape or electrical tape around the join, or make the end piece hang over the collar with flanges cut to bend over the collar and be  taped down.

 

For your standard Newtonian Reflector or Schmidt-Cassegrain, you will mount the filter material off-axis to avoid light blockage by internal components mounted inside the telescope tube.  The collar may be made from cardboard, cardstock, or opaque flexible plastic.  The cap  material should not allow any light through either the hole around the Baader Material, or the edges where it connects to the collar.   You may need to run duct tape or electrical tape around the join, or make the end piece hang over the collar with flanges cut to bend over the collar and be taped down.

 

 


    

DUST CAP MOUNT

Images were submitted from Cindy who constructed her off-axis filter using her telescope's Dust Cap.
This is probably the most practical method to make a secure off-axis filter if you have the proper tools to make it and your telescope comes with a dust cap.

 

 

Picture 1

Using a 3.5" circular bit from Lowes to drill the hole, I actually just hand-rotated it and cut through the soft plastic without attaching it to a drill bit.  Pretty easy.  I used sandpaper to smooth the edges.

Picture 2

This is an 8" dust cap for the XT8. It's an older version that is flat on most of the top-perfect for an off axis solar mask.

Picture 3

The film was cut and taped in place over the hole.  I did not remove the film from the 2 sided card stock it came in.  That made it easier to keep it from getting smudged.

Picture 4

I cut a piece of white cardboard to mount over the top (outside) of the dust cap and taped it in place.  The white helps reduce turbulence from the added heat of a black cap.

Picture 5

The solar filter is lined up so that the filter is between two spider veins.  The cap is very snug on the OTA, but you may want to tape it on to be sure it doesn't accidentally fall off.  I used an old Telrad (got the idea from another amateur astronomer) to create a solar finder. The light falls through the hole drilled in the flat wooden piece that is parallel to the bullseye. This is to line up the 'scope without directly looking at the sun. 

Note:  You don't look through the Telrad, anyway.

 

 

 

 


 

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