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How to make a cheap neutral density filter
This is a cheap neutral density filter for photography. It costs around €4 each instead of €70-90.
- Cheap welding glass
- Step-up adapter ring
First you need a cheap welding glass that will be big enough.
The next thing you need is a step-up adapter ring. Mine is 67-72 mm since my lens are 67 mm in diameter.
You need to cut the glass to the bigger diameter of your step-up adapter (72 mm in my case).
Check the fit between the ring and the cut glass and avoid glass imperfections as shown. This is why I bought two welding glasses.
Apply some Sugru in the ring and press the glass against it, then trim the excess of Sugru and wait 24 hours.
This is the original picture with a 30 seconds exposure.
This is the picture with some corrections in Photoshop.