Welders Glass ND Filter

I was reading online about a cheap alternative to a Neutral Density (ND) filter to use for photography. An ND filter is basically sunglasses for your camera. It decreases the amount of light that gets through, thus allowing you to keep the lens open longer. Neutral density filters can cost as much as $400 for a really nice one.

The cheap alternative is to use a welders glass. They type of glass that welders for eye protection against the bright light created during welding. So i went to Lowe's and bought one.

Then because my new camera only has a small lens i decided to cut the glass down to about 2" x 2".

And make a type of "dark housing" to fit over the camera lens. I used a piece of PVC pipe and a permanent marker to color it black.

Then glued it together.

I used a rubber band to hold it onto the camera and some cloth on the edge so it wouldn't scratch anything.

The two main problems with using the welders glass is that it is not as high a quality as an ND filter and that it has a green tint. This is what the image looks like right out of the camera. This was a 64 second exposure during the day.

But in Photoshop this can be corrected, mainly by adjusting White Balance and Tint.

That design was not the best, it was too big and heavy. So i tried to simplify it.

I started with the same 2" square piece of glass that i cut from the larger glass. But then i used pliers as a kind of glass nippers and slowly broke off corners until it was round.

I sanded and filed the sharp edge. Then just as before i glued it to a PVC pipe i colored black, inside and out. But the key difference is this time is that i glued a foam ring to the inside of the PVC.


I sanded the foam down until i could slide it onto the outer lens, but with just enough pressure that it wouldn't fall off.

I plan to use it when i'm in Tennessee to take pictures of some waterfalls.