Machining Video: A Simply Way to Determine Laser Machine Lens Diameter and Compare Focus Length with AM.CO.ZA Stocked Lenses
In this video, we will show you a simple way to find the diameter of your lens and to compare Focus Length.
The first step is to take the lens out. And measure the lens by itself using a metric calliper if you have one at your disposal, as it will give you the most accurate answer.
You can use a 50.8 or 63.5 Focus Length Lens as long as it is still 19mm to compare your current lens to.
All you need to do is put two cups upside down and put a CD on top. Your lens can then be put in the middle of the CD where the hole is. And using just a regular flashlight that you can find on your phone as well; shine it on the lens and a light will appear on your surface area between the cups.
Always keep your flashlight distance the same or you will get conflicting results. To find the focus length you will need to compare your original lens to a 50.8 or a 63.5 (these are the most common) and whichever ones give the same light on the surface area will then tell you what your Focus Length is.
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