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We recently purchased a cheap DSLR camera and found that with the wider FOV our original mask was blocking too much light as Ray suggested. So we decided to make a laced mask ala Ray's. This has proved to work very well with the DSLR. Attached is the dxf file for the outside frame. If you use DXF2GCODE the dxf file layers automatically creates your drill files and routing files, of course you will need a tool change between layers. The construction layer roughly shows the lacing pattern but the pictures should clarify the details. There is also a single sub with the mask in position showing the diffraction spikes. (note the one star on the bottom left of the pic which is clearly different focus to the rest is a double star)
Thanks Ray.
Clare & Peter
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