During the 13th century Edward the First built a series of castles along the welsh coast in order to impose his rule over the fractious natives.
The most northerly of these is Flint castle on the estuary of the river Dee, featured in this time lapse video.
When the castle was originally built the sea came right up to the walls, providing both defense and a means of resupply in the event of a siege.
But over the centuries the river Dee silted up, leaving Flint castle high and dry for most of the year.
However, every now and then when there's a particularly high spring tide the sea manages to briefly reclaim the land it lost, returning once again to wet the stones at the base of the castle.
Such was the case on this day in late September, when my wife Liz and I positioned ourselves on the earth berm overlooking the salyt marsh in front of the castle to watch and film as the tide came in.
The weather was quite frisky that day, with clouds racing by overhead casting patches of sunlight and shadow over the rapidly disappearing marsh below.
Then a brief shower arrived, creating a vivid rainbow over the castle just as the tide reached its highest point.
Once the tide turned and started going out again we re-postioned ourselves and filmed another time lapse sequence, Flint Tide Timelapse #2, showing the marsh grasses re-emerging from under the sea.
Filename - flint tide timelapse 01
Camera - Canon EOS 6D
Lens - 24-105mm zoom @ 28mm
Exposure (start of sequence) - 1/160 sec @ f4, ISO100
Exposure (end of sequence) - 1/160 sec @ f4, ISO100
Filters - Polarising filer used to reduce glare and enhance colours. 2 stop neutral density graduated filter used to reduce the brightness of the sky.
Shooting interval - 3 seconds
Location - Flint Castle, North Wales
This clip - HD 720p, 30fps (4K+, and 1080p HD formats also available)
Clip duration - 19 seconds
All content copyright © Howard Litherland 2009-2020 unless otherwise stated.