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I have just been left some photography equipment. The item is made up of two parts: a flat square and a circular piece together with a holder and a number of adaptor rings. I am used to the circular polarizer, but am at a loss as to how this works.

  • 3
    A picture is worth a thousand words... – Tetsujin Mar 2 '18 at 11:50
  • Based on your purely on your description it sounds like a ND filter with various attachments to attach it to different size lenses. But I agree a picture would help a ton. – TheXed Mar 2 '18 at 13:09
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It sounds like a Cokin system holder, including adapter rings for several sizes of lens threads and a couple of filters.

enter image description here

The Cokin system require at least three parts:

  • An adapter ring that screws onto the filter threads on the front of a lens.
  • A filter holder that attaches to the adapter ring. The regular holders can hold up to 3-4 filters at the same time. There are also 'slim' holders that can only hold one filter but can be used on wider angle lenses without vignetting.
  • A filter. Most of the filters are square. These are a variety of types: color correction, neutral density, graduated color or neutral density (rectangular to allow for sliding in the holder to adjust the location of the gradation in the frame), and polarizers (circular with a ridged rim to allow easy rotation while in the holder.

It sounds like your square filter may be a neutral density filter.

The Cokin system comes in several sizes:

  • The "A" series can fit on lenses with filter threads up to 62mm. The filters in the A system are 67mm square, 67mm in diameter (circular polarizer). The "A" system is not recommended for lenses wider than 35mm (or FF equivalent angle of view). Some people think the "A: stands for 'amateur'.
  • The "P" series can fit on lenses with filter threads up to 82mm. The filters in the P system are either 84mm square or 84mm in diameter (circular polarizer). Lenses with an angle of view of up to that of a 28mm lens on a FF camera may be used with the regular "P" holder. A special single filter holder accommodates wider lenses down to 20mm (or FF equivalant angle of view). Some people think the "P" stand for 'Pro'.
  • The "Z-Pro" series can fit on lenses with filter threads up to 96mm. The "Z-Pro" filters are 100mm squares (4x4 inches), 100x150mm rectangles (4x6 inches) that allow graduated color or neutral density filters to be slid in the holder in order to adjust the position of the gradation in the frame, or 100mm in diameter. In addition to Cokin filters, the Z-Pro system can accommodate 100mm/4 inch filters from other systems such as Lee, Tiffen, and Schneider.
  • There's also an "X-Pro" size that is even larger. It is mainly used by medium and large format photographers as well as advanced videographers. The standard filter sizes are 170x130mm (5.3x6.6 inches).

enter image description here

  • how doesn't the filter slide out of this holder on its own? – ths Mar 2 '18 at 15:16
  • +1 from me, but let's not forget about Formatt Hitech and Lee for square filter options. @ths - there's a flexible plastic tab inside the grooves that provides pressure to the filter, causing it to stay in place. Mine are actually very stiff - there's no worry about a filter coming loose, even over time. – Hueco Mar 2 '18 at 16:20
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    @Corey Most of the others were considerable higher end than the Cokin system, which is what most retail photo stores carried. I wouldn't say one of the others is impossible, but the odds are probably highly in Cokin's favor based on the number of units of each that were sold. I may be reading too much into the question, but it sounds to me like an uncle, grandfather, etc. bequeathed the items to the OP. Again, that situation seems far more likely to have been stuff on the consumer end of things. Pro stuff would have probably been sold along with most equipment upon retirement. – Michael C Mar 2 '18 at 22:42
  • @ths basically a piece of the holder acts as a spring to put tension on the edge of the filter and hold it in place. The Z-Pro and X-Pro holders are adjustable for thickness and have modular pieces that can be assembled/disassembled for a particular purpose/filter thickness. encrypted-tbn0.gstatic.com/… – Michael C Mar 2 '18 at 22:47
  • @ths That information and a lot more is included in the article at the link in the first sentence of the answer above. bhphotovideo.com/explora/photography/hands-review/… – Michael C Mar 2 '18 at 22:57

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