Or today I had a 30 minute window to test my new home made white light solar filter on the DSLR,
Got it out, set it all up, figured out some settings, checked the sun was in the FOV then zoom it out to 400mm to get a decent image scale (all thsi took about 15mins) then thought why has the sun disappeared from the view finder?
Sure enough there was 1 tiny cloud and guess where it decided to sit for the next 10 mins!!!
Malcolm