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11-10-2013, 03:50 AM   #1
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square filters

Yesterday I bought one of these:

Today I found some filters that looked square. I got home and discovered that the Kenko filter is indeed square, measuring approximately 75mm x 75mm. But the three Cokin filters I bought are not. They measure 66mm x 70mm.
Now, inside the filter holder there are a couple of frame-like things, one nested inside the other. Can those be used to adapt the smaller Cokin filters for use with this holder?

This is my first venture into square filters and filter holders so I am completely ignorant. I want to use them with my Pentax 67ii, especially when shooting B&W film. The holder and filters are all used and cost less than $5 a piece so its not a big deal if I got the wrong thing. For reference, the Cokin filters say Cokin A 001, A 004 and A020 on them. The Kenko filter says B-05 on it.

11-10-2013, 04:36 AM   #2
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It's marked "Gelatine Filter Holder" so I'm guessing the frames are for holding 3x3 inch gelatin filters (thin sheets) You should be able to use any 3 x 3 in filter without the frames. You can cut down the gel filters used for lights but they may not be as optically perfect as the 3 x 3 in filters.
11-10-2013, 05:20 AM   #3
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Some of my Cokin filters are 67mm square and some are 67x70
11-10-2013, 05:45 AM   #4
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Oh, ok so gelatin filters are the flimsy, thin ones then. I didn't quite understand that part. And these thicker hard plastic filters I bought aren't gelatin then? That would make sense as the frames in the holder won't take these filters because they are too thick. But if I skip the frame and just stick the filter in the holder it tends to sort of slide around, especially with the smaller Cokin filters.

11-10-2013, 03:57 PM   #5
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I suppose you could always make a shim of some sort out of plastic or thin wood. You can find these materials in a model airplane/railroad/hobby and some hardware stores.The Cokin filters are the "A" series and probably are not wide enough to cover the field of view of some of the lenses for the 67ii. The Cokin "P" series filters are 80mm wide and maybe too big for the holder.

The Cokin filters are not square to allow you to shift them to move the effects off center.

Cokin makes gel filter holders for their holders. The "A" version requires you cutting the gel filter down to size.
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