The route up that circles up around the south of the corrie to the summit of Lochnagar. The two specks in the centre left are two climbers. Their progress can be seen below as the cloud came in about 45 minutes later.
Distances can be so deceiving in a shot like this! From the foreground footprints it would not seem that the people would look so small up there. Great with the light glittering on the snow. Well done