The Freewell K2 filter holder is a little slimmer than the average filter holder, but that’s partly because it only has one rectangular filter slot.
It’s main body, release buttons and locking screws are made from metal which gives it a durable feel.
As usual, the first step in using filter holder is to mount an adapter ring on the lens. The Starter kit includes four adapter rings to enable the holder to be mounted on lenses with 67mm, 72mm, 77mm or 82mm filter threads. Other adapter rings are available from Freewell Gear and the minimum size currently offered is 52mm.
With the adapter ring on the lens, you need to press the rectangular red buttons on either side of the holder so that it can be mounted. Releasing the buttons, keeps the holder on the lens, but the red locking pins should be rotated to keep it in position securely.
If you’re planning to use a variable neutral density filter, the next step is to mount the round VND Base filter. This has a small tab that slots into a reciprocating notch in the holder. When it’s in place, you should be able see a small graphic on the filter’s tab and read ‘VND BASE’.
Now you can mount the VND filter of your choice to cut out 1-5 stops or 6-9 stops of light. You should be able to see ‘TRUE COLOR’ and ‘1-5 STOP’ and or ‘6-9 STOP’ – indicating that the filter is the correct way round.
The VND filters pop smartly onto the rim of the K2 filter holder, however, they need to be rotated to enable them to seat correctly so the hard stop feature works – you’ll feel it snap into place.
Once the VND is correctly mounted, and when the holder is orientated with the small spirit level (bounded by two white arrows) on the back is at the top of the lens, you should see a small white arrow on the red rim of the holder at the 3 O’clock position (as you hold the camera for use). This is the marker to set or read-off the degree of filtration. When the filter is correctly seated, it can only be rotated between the two extreme ends of the ND filtration.
The rectangular filter slot, the K2 Island, is revealed by pushing back the ridge plastic sections at the top and bottom of the holder. These pivot around sturdy-looking pins on either side of the holder, and they can be pushed back until they rest on the lens barrel.
Freewell Gear’s K2 slot-mounted filters such as the K2 0.9 soft graduated ND filter and reverse gradient filter are supplied mounted in a rectangular metal frame. Others such as the K2 Diffusion Snow Mist and K2 Cinemorphic Gold Streak are shield-shaped and have an appropriately shaped metal frame. Both types of frame have a wide tab at the top with ridges to give a good grip and are clearly labelled on both sides with the type of filter.
The filters fit snuggly in the slot in the holder and take a little wiggling to get them to slide down into position. The frame of the rectangular filters also tends to catch on the bottom of the holder as they are extracted and, again, a bit of wiggling is required. It means that you need to take care to support the lens as your fit or remove a filter.