[Jim Dockery]

Cool technique to substitute for GND filters on long exposures.

[GaliWalker]

Also known as the "Black Card Technique", which I used here a few years back:

It's useful if you don't have a GND to cover the exposure difference between the bright and dark, but I don't use it that often; I would sometimes get blue tints from sunlight reflecting off the edge of the black card onto the lens.

[North Cascades]

Thanks for sharing. I can't wait to try this.

[NacMacFeegle]

I've been trying this out recently with mixed results, I've several times overexposed a scene the point where the highlights are lost, but in the shots where I got the exposure right it worked very well.

[gb]

For years I've hand held grads figuring that by moving the filter up and down the graduated edge would be blended better. Just have to be careful not to bump the camera.

[scole]

Meh. I'll pass on this. I'd rather manually blend exposures in Photoshop or hand-hold GND filters in the field.