Canon RF-S3.9 mm F3.5 STM DUAL FISHEYE Instructions Manual page 16

Filters (Sold separately)
When using sheet filters (gelatin filters):
Download the filter template files, print them out, then lay the filter over the template and cut to
match. Then insert the filter in the rear filter holder.
1
Cut the filter to match the filter template outline.
Download the filter template file (PDF).
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Print the filter template out at full size (100%), and use it as the template to cut out the filter.
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Also print this page out at full size and use it as the template. The filter template file is the same as this figure.
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Filter template outline
27.3mm/1.07in.
8mm/0.31in.
8mm/0.31in.
ENG-15