In this chapter, we have a video, that will show you how to use a wet lens holder.
If you just have one wet lens and never take it off underwater, there is not much use for a lens holder.
But if you like to take it off sometimes and use your housing without the wet lense, then you need a place to store it… or you might risk losing the lens.
How many are needed?Also – if you have 2 wet lenses, then you need 2 holders.
The reason is, that you need a free place to mount the wetlens you take off – before you start removing the second lens from its holder and adding that to the port.
Trying to work with 2 wet lenses in open water is a certain way to lose it…
Consider a good and well-mounted wet lens holder as an insurance… and a help… like an extra arm.