Originally Posted by
JanMM
Have used Take a Look mirrors mounted on helmet visor for several years but have been using various helmet- or glasses-mounted mirrors since at least 1981. With a few bar-mounted mirrors, too, over the years but not for quite a while.
I've been riding recumbent bikes for more than a decade and have no choice but to use a mirror.
And that looks like the correct lens hood for the Canonet, either squared off or with vents to minimize blocking the rangefinder window. I've found exactly one of those in 30 years, at a camera show several years ago. Turned around and resold it to a collector that same day!