Beijing is famous for the many old narrow Hutong (胡同) streets formed by closely attached Siheyuans (四合院) that are the traditional courtyard residences in Beijing and often many hundred years old.
From today on this site is secured and certified via SSL. In the past it was difficult to get a certificate for your website that is accepted by your browser and you had to pay for it. Letsencrypt.org is a new certificate authority, free and relatively easy to set up. It took me 1 hour (including research) to get the certificate for my domain and set up the Apache2 webserver and my site.
“Praktica”, “Carl Zeiss Jena”, “Pentacon” or “Meyer Optik Görlitz” are very well known brands in East Germany and beyond. Since I started with photography using Praktica cameras I have still a faible for it. On Berlin flee markets you can find them quite often. Carl Zeiss Jena lenses are still a nice choice as adapted vintage lenses on modern digital cameras.