So here is the scenerio… you are taking time out to go on vacation and you are in an incredibly scenic area with lots of rivers and waterfalls, and when you get there, you realize you forgot to bring a neutral density filter… or maybe you have never used one before. When you start to take shots of the wonderful flowing water, it just looks blah. This is when you miss the power of being able to slow your shutter speed down enough to smooth out the water so that it is nice and silky. So you either… call your friend/spouse/neighbor etc… to mail you your filter, or you order a new one online since you can never have too many gadgets :D. It is at this point that you wish Amazon had the drone delivery system working, so you could order from you phone and have it dropped down to you in the river in 30 minutes. But alas, the very fact that you are in a remote wonderful place means that delivery of that much wanted/needed filter is probably two or three days away. Even one day delay can cause you to miss a lot, so here is the $5 work around while you are waiting.
Go to your nearest Hardware store (usually closer and more available than an actual photo store…) and find the welding area… and get a piece of dark welders glass that is used in the masks. I bought mine with tax for $5.33.
Now you will want to set your focus beforehand and then attach the glass to the front of your lens. I used two rubber bands and my lens hood to hold it in place. You will have to play with the settings, but hopefully you can get shutter speed times up to 2 seconds or more. Now the water flow is nice and creamy.
The downside to using this glass is the color cast, so you will almost certainly want to convert to black and white, but for five bucks you can definitely make due until the Fedex truck arrives.