Here are a list of external photographic related website and information.
Photographic Alliance of Great Britain – http://www.thepagb.org.uk/
Ephotozine – https://www.ephotozine.com/
ON1 Photo RAW – https://www.on1.com/
Wacom tablets – www.wacom.com
MPB second hand cameras and lenses – https://www.mpb.com/
Depth of Field Calculator http://www.dofmaster.com/dofjs.html