- rear lens cap / front lens cap
- bench drill (best option but you can also use a hand drill)
- door eye viewer (got mine from a dollar store, the wider the better)
1. find the center of the cap and drill a hole the size of the viewer
2. pop the bottom half/nut part through the hole
3. screw the viewer on and it's done
rear cap and door eye viewer
right: EOS mount to 58mm ring (reverse macro ring)
mounted on 18-55mm lens
used a rear cap since i had a spare one and also have the reverse ring. doesn't really matter but the longer the distance between the lenses the better. and there's also the possibility of scratching the lens/filter if you push the metal part too far back
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