06/05/2026
Today I've been mostly messing about with focus stacking. I can almost hear the collective "Eh?" from both my regular readers. Read on...
TLDR: A convoluted way to take pics of Mountain Pansies on Clee Hill, with a tedious, long-winded explanation of why they're not quite right. Probably best just look at the pics.
The Mountain Pansy, Viola lutea, is our largest native pansy and can be found on unimproved upland grasslands in the north and west of the UK. In Shropshire it is in decline, though it does continue to appear on the Clee every year (if anything, my non-scientific assessment is that it's more prolific this year, which is nice).
I've often idly thought it would be nice to get a picture of the pansies with the Titterstone Golf Ball (air traffic radar dome to the uninitiated) in the background. The problem is getting everything in focus, front to back: focus on the foreground pansies and the golf ball is a blur, and vice versa.
What is called for is extreme depth of field, and that's where focus stacking comes in: Basically I took a pile of piccies of the same scene, with the camera's focus point moving slightly between each shot (the camera can be set up to do this automatically so I don't lose the will to live). The resultant pile of piccies, each with a different sliver of the scene in focus, is then loaded onto the computer and clever software takes all the 'in focus' bits of each scene and blends them into one picture where everything is in focus. Mostly... All while I sit back with a cuppa and an Aldi knock-off Penguin choccie biccie. Seal bars they're called. Look and taste just like Penguins. Their Wagon Wheel copies are called Cart Wheels. Dunno how they get away with it.
Anyhoo, I say 'mostly' everything is in focus, 'cos if there's even a slight breeze and the flowers or grass move, weird things happen (smudged areas, double grass blades etc.) which is evident here. Still, not bad for a first attempt. There are probably ways around it with manual intervention (re: above comments about losing the will to live) so for now I'll try again when it's less windy.