My friend says they’re up/down reversing glasses unless otherwise specified, though left/right versions do exist. He hasn’t heard of anyone doing experiments involving pinhole-type reversing glasses. He also says to tell you to google “Richard Held”.
My friend says they’re up/down reversing glasses unless otherwise specified, though left/right versions do exist. He hasn’t heard of anyone doing experiments involving pinhole-type reversing glasses. He also says to tell you to google “Richard Held”.