tiabunna's photos with the keyword: Auto Rokkor PF 1:1.8 55mm

From an old 1966 slide and from a set moved from the 'other' site. We were knocked over by those clouds behind the meteorological office. They are Nacreous Clouds, also known as "Mother of Pearl" clouds because of their colours or, more currently, as "Polar Stratospheric Clouds". They are made of ice crystals (which give their colour) and are about 20,000 metres high with temperatures dropping to about -80 C. They had always been considered quite rare and I believe our sighting was one of the first confirmed in Antarctica: there have been numerous sightings since.. Ozone depletion caused by chlorofluorocarbon gases has caused the polar stratosphere to become colder in spring (ozone keeps it warmer, so less ozone ie "the ozone hole" means lower temperatures) - yes, this is relevant to climate change. View on black. And HFF!

From an old 1966 slide and originally on the 'other' site. Only now being added to groups. Looking west at sunset, the light had gone from the land, the sunset was yellow, but those rare nacreous clouds continued to shine brightly long after sunset - because of their height they were still in sunshine. The colours were beautiful, I wish I'd had a digital camera to make the most of them. Best on black.