Dating hole in cap cans
Mark out the center of the body cap and make an indent by pressing the tip of the drill bit into the center mark.
Tape the foil onto the inside of the cap, keeping the sheet taut.
A downlight can act like a chimney and draw out warm, rising air from a room, up into the cold space above, the effect would be considerably worse in upper floors containing lofts.
This poses the question: Can I put insulation over downlights?
As long as you can spare a body cap you can do this.
The lens emulates the distinctive vignette and softness of a pinhole photograph in a fraction of the time and is great for adding an abstract or surreal quality to an image.