• Daniel Wretham

Kase Filters K9 Holder Kit & Polariser Review

Updated: Sep 7, 2020


Kase K9 Filter Holder Review

So I've been using the Kase Filters K9 holder and polariser for a good few months now and I thought id share my views on it with you all.


Having decided to make the switch from Lee Filters to Kase Filters was a big deal for me and if you have read my previous blog on the subject you will get why.


The main reason for buying the Kase K9 kit was to solve the problem of vignetting on a 15 mm lens, other filter holders claim their holder will solve this but from past experience it doesn't and the Kase K9 holder was the first I tried that actually did it.


Not only can I have a polariser filter on but also two ND filters without any sign of vignetting on a 15 mm lens, in fact Kase state that you can use this on lenses of 14 mm on a full frame camera with no signs of vignetting.


The Kase K9 holder is an evolution of several previous versions, each making innovative improvements on its predecessor and the K9 is the very peak of all of these refinements,


So the main thing about the Kase K9 filter holder that will grab your attention is the fact that it uses a magnetic system rather than the traditional way of a polariser being screwed on the front of the holder and rotated.

This has several major advantages,


1, it makes the filter lightning fast to place on and off simply because as soon as its close to the lens it works its magnetic magic and grips straight onto the step ring which is mounted to the lens, unlike the screw on filters which need to be screwed on and after a period of time generally they get stuck, this can't happen with the Kase polariser simply because its not threaded and uses magnetic force instead.


2, The polariser filter sits behind the graduated filters which again all aids with the vignetting situation, to give you an idea when I used the Lee filters holder and landscape slimline polariser I was experiencing vignetting right up to 21mm, but with the Kase system I use a 15 mm lens and have absolutely zero vignetting and that's as wide as that lens will go!


3, The system is so much more ergonomic than others on the market and makes it extremely simple to operate, the neatness of the polariser being behind the ND grads makes it feel so much more compact too plus it keeps the polariser completely protected from the elements because its behind the grads.


kase Filters K9 Review

The Kase K9 holder is super lightweight and has had the edges smoothed down and reduced over the K8 holder to again aid the ergonomics and the weight, plus a beautifully simple recess for your finger or thumb to aid removal of the polariser.


The holder has two controls on the outside as well, one is a small geared dial so you can turn it and the polariser rotates very easily and because Kase Filters made this larger on the K9 filter holder you are able to operate it easily while wearing gloves.

The other control is a thumb screw that tightens the filter up when its on the step

down ring which stays on the lens, its really easy to operate with a simple thumb and finger grip to enable you to rotate the filter holder to the desired position or for removal.

This control also feels substantial and of high quality and can also be operated with gloves on.


Moving to the guides for the filter you can fit up to 3 ND graduated filters in at anyone time plus the polariser, although I personally choose to use just two.

The guides are designed to take filters up to 100 mm in width (Length wont matter) so you could in fact use the Kase K9 filter holder with existing filters if you so desired as it comes with 2 mm guides as standard but also 1.1 mm too.


The guides are very smooth and sturdy and the filters slide in very easily but hold firm and can be easily adjusted with one hand, they don't scratch up the sides of your filters either with an innovative little gasket fitted on them.