Polarizing Filters for the Filter System
If you use a filter holder, you don't need to attach the polarizing filter to the lens—it's built into the system. Here you'll find Haida's plug-in polarizing filters for the 100-mm and 150-mm systems, which allow you to use polarizing and graduated filters at the same time.
Polarizing Filter in the Filter Holder
The reason for this solution is simple: A polarizing filter screwed onto the lens and a filter holder get in each other’s way. The holder sits in front of the thread, the polarizing filter sits below it, and then it can no longer be rotated. In this system, the polarizing filter is therefore positioned where it remains accessible.
Both at the same time
The real benefit is the combination. A graduated neutral density filter tones down the bright sky, while the polarizing filter reduces reflections from the water below. Using both together is the classic setup for waterfront landscapes, and you can’t achieve that with filters screwed on separately. In the holder, the filters sit one behind the other, and each remains individually adjustable.
100 mm or 150 mm
The choice depends on your filter holder, not on the filter itself. The 100-mm system covers standard wide-angle and zoom lenses and is the most common standard. You’ll need the 150-mm system for super-wide-angle lenses with a curved front element, where a smaller holder would appear in the frame. When purchasing, the only thing that matters is that the filter fits the width of your holder. You can find more information about the system and compatible holders under Plug-in Filters and Filter Systems and Filter Holders.
When a screw-in filter is sufficient
If you don’t own a filter holder and don’t plan to get one, this system isn’t the right choice for you. A screw-in polarizing filter costs a fraction of the price, weighs next to nothing, and performs exactly the same on its own. The plug-in filter is only worth it if you plan to combine it with other filters.


