The slow glass
Three filters. Five locations. Everything I know about shooting with slow glass.
The sky over Goa was doing something I hadn't seen before.
Not a postcard sunset. Not golden hour behaving itself. This was the kind of sky that makes you check your insurance. Low, dark, moving fast, bruised purple at the edges where the light was still fighting through. The sea had gone the colour of lead. Rain was maybe ten minutes away. Probably less.
I took out my 10-stop ND filter.
There was a flat-topped rock nearby, angled just enough towards the water. I set the camera on it, checked the horizon was roughly level, and started a sixty-second exposure. The kind where you press the shutter and then just stand there, watching the storm approach, doing mental arithmetic on whether you'll finish before it hits.
Just about. The shutter finished as the first drops hit.
That image is one of the most dramatic things I've ever made. The storm that was chaotic and fast-moving has been compressed into something still. Something inevitable. A weight in the sky that the eye alone couldn't have captured. The ND filter didn't create the drama. It just gave me a way to hold it.
That's what these filters actually do. They're not technical fixes. They're creative tools. They let you photograph a scene the way you experienced it, not the way the camera would have recorded it if you'd just pressed the shutter and hoped.
The 10-stop: when you want to erase time
A 10-stop filter reduces the light reaching your sensor by a factor of a thousand. An exposure that would normally last 1/30th of a second now lasts thirty seconds or more. In that time, everything that moves leaves a trace. Or, if it moves enough, disappears entirely.
Water stops looking like water. Waves erase themselves. The surface of the sea becomes flat and even, a single continuous plane that suggests movement without showing it. What remains is the structure of the scene: the colour, the light, the shape of the land and sky, without any of the noise.
Havelock Island in the Andamans. The water there is a colour I've never managed to name. Somewhere between turquoise and aquamarine, with that particular clarity you only get in places the sea hasn't given up on yet. I wanted to photograph that quality without the chop and the movement getting in the way. Ninety seconds with a 10-stop filter. The waves erased themselves. What was left was the colour, the light, and the horizon.
Hampi is a different kind of stillness. Ancient boulders in every direction, ruins dissolving into the horizon, a quality of light that makes everything feel permanent. The water had ripples and movement. The clouds overhead were shifting. A sixty-second exposure compressed both into a single frame. What came out wasn't exactly what I stood in front of. It was quieter. More like how the place actually felt.
The reverse ND: built for the horizon
At sunrise and sunset, the problem isn't the sky. The problem is the horizon.
The band where the sun meets the water is always the brightest part of the frame, and it's exactly where a standard graduated ND lets you down. A regular GND is darker at the top and fades to clear at the bottom. Useful when the sky is the bright thing. But at golden hour, the top of the sky is manageable. It's that thin strip at the horizon that burns out first.
A Reverse ND is darker in the middle and lighter at the top and bottom. It targets the horizon specifically. In Thailand, shooting directly into the warm light as the sun dropped towards the water, the 3-stop Reverse ND was what made the frame possible. Three stops of correction, placed exactly where the problem was. The sky held detail. The water caught the colour. The horizon stayed in the image instead of burning through it.
Without it, I'd have been fighting a graduated brush in Lightroom for an hour trying to reconstruct something that was never properly captured. With it, I got what I came for and went for dinner.
Not all movement needs to disappear
The assumption people make about ND filters is that the goal is always maximum time. Silk water, stretched clouds, the longest exposure you can manage. But that's not always the right call.
Sometimes the movement is the story. Not the chaos of a rough sea. The energy of water going somewhere. A wave surging up a rock face. A current pulling through a gap. If you smooth that away entirely, you lose what made the scene worth photographing in the first place.
This frame used a 3-stop Reverse ND at a shorter exposure than I'd normally run. Long enough to balance the sky against the foreground. Short enough that the water retained its movement. Blurred, but not erased. You can still read the shape of it, the direction of it, the energy of it.
The filter you reach for is a creative decision about what the image should feel like. Do you want stillness or movement? Calm or energy? Decide that first, then choose your glass.
How I choose which filter
I carry three. A 10-stop for when I want to compress time and erase movement entirely. A 3-stop Reverse ND for sunrises and sunsets when the horizon is the problem. And a 2-3 stop standard GND for scenes where I just need to bring the sky down without doing anything dramatic to the foreground.
They go in a small pouch. They take up almost no space. And they change what I come home with more than almost anything else in the bag.
What took me a while to understand is that none of this works if you don't know what you want the image to feel like before you put the filter on. ND filters are creative tools, not corrective ones. You're not fixing a problem. You're making a decision about time. How much of it the frame should contain, and what that time should do to the world in front of you.
Get that part right, and the filter just becomes part of how you think.
Prints from Goa, Havelock, Hampi, and Thailand are available in the shop.
