When in Paris the last time, I discovered this “très chic” accessory for landscape painters. Called a “lentille de paysagiste“, this viewfinder is in fact a concave lens which reduces the size of the landscape you look at, making it easier to appreciate the proportions. It exists with or without grid and comes with the delightfully retro little case.
I bought this item at Couleurs du Quai Voltaire, but apparently, it is made by Optico Paris. I am not sure about the price, but as far as I remember, it was something around 40 euro.
