Providing your polariser has a repeat thread to accept the LEE adapter rings then there is no reason why you cannot use existing screw-in polarisers with the LEE System. Bear in mind however that polyester filters, if used in the holder in front of polarisers, will stop the polariser working correctly.

To fit the 105 polarising ring, you simply have to remove the two front cover plates from the filter guide stack. These cover plates are for cosmetic purposes only and serve no other function.

Removing the plates will give you enough distance to then use your existing screws to secure both the filter guides and the 105 polariser ring.

You will simply need a LEE Filters holder (100mm foundation kit) and the relevant size adapter ring (wide angle if necessary) – The filters can then be bought separately as needed, a good starting point would be a 2 stop(0.6) Hard edge ND grad.

Alternatively, the very popular DSLR starter kit would be ideal – you just need to add the adapter ring as this is not included in the kit.

The standard size for the LEE Filter System is 100mm wide, however, they also have the Sev5n (75mm) and the SW150 (150mm) filter systems for more specific uses.
As LEE resin filters are hand made, they can make any size to special order, with enough notice.

On any lens wider than 24mm (on 35mm) or the equivalent on Digital or larger formats, using a wide angle adapter ring will greatly reduce the chances of vignetting.

The LEE Filters Universal hood is the sensible choice for most styles of photography. It will cover a reasonably wide focal length and as it is configurable by the end user, it can be used with 1 or 2 filter slots, or as a hood alone.

The wide angle hood is physically much larger, and will cover a wider focal length on most cameras. It is also fully configurable by the end user.

In Full Frame terms, the Universal hood would cover approximately 24mm effectively, the W/A hood. approx 21mm.

Both hoods can take the 105mm polariser ring inside the bellows, allowing the use of a screw-in 105mm polariser if required.

The Zeiss 15mm will take no filter system unless you have the hood removed by Zeiss (a service they now offer which is not as costly as you may think)

With the hood removed, the 15mm will take the LEE SW150 system and a 95mm screw thread adapter – or if you are already invested in the 100mm system, you can use the Lee Filters 100mm push-on holder straight to the hood-less lens, but only with one filter slot to get results without vignetting.

A Professional kit consists of 2 x Foundation kits ( Filter holders) and a joining part allowing the two holders to rotate separately.

This is usually only purchased when graduated filters are needed to be placed at different angles to each other or a square 100×100 polariser is purchased and needs to rotate independently of a graduated filter.