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01-28-2013, 09:55 PM   #1
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Cokin adapter for traditional filters?

I wonder if anyone has ever invented a slide-in adapter for the cokin series that had threads for traditional filters? I know that that problem is exactly what the filter system is trying to solve, not needing separate sizes of filter for multiple lenses, but the fact is, sometimes (usually?) traditional filters are of much better quality than the cokin filters. Specifically, I'm thinking about the cokin polarizers, which are unimpressive. I already have some very good screw-in polarizers, but I'd like to use the cokin system for my ND grads, and a screw-in polarizer on the lens with the cokin system in front of it is clumsy at best, unusable at worst. It seems that a simple slide in card with an appropriately-sized hole with threads would be very useful. So, does it exist? If not, perhaps I can convince folks with a kickstarter project.

01-28-2013, 10:17 PM   #2
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Well, ok, I thought that Ask BHPhoto was a good place for this, in case they had one that they wanted to sell me, but it's fine wherever you want to put it. Pentax Lenses is a little odd of a place, but that's ok.
01-29-2013, 07:18 AM   #3
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Hello,

There is no adapter I know of, but there are higher quality filter options in the Cokin sizes.

The Hitech filter system is made by Formatt - an English company that is renowned for its high manufacturing standards and consistency of quality. Their CR39 resin is manufactured in large sheets that are oven cured. Their exclusive Absorbing Cell Technology absorbs color as opposed to other filters that are coated. Once cured, they are sliced up to create individual filters. In this way, maximum consistency is maintained from filter to filter. This becomes crucial when you wish to change filters either mid shoot or from day to day.

The 85mm Circular Polarizer from Hitech is designed for the Cokin P system.


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01-29-2013, 08:10 AM   #4
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Why not use step-up/down rings?

step-up rings| B&H Photo Video

02-03-2013, 08:50 PM   #5
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QuoteOriginally posted by Not a Number Quote
Why not use step-up/down rings?

step-up rings| B&H Photo Video
How would you envision step up or down rings working in a Cokin-style system? And even if you could get one that was the right size to slip into the slots, the whole thing would turn, rendering the use of a polarizer rather useless. Or, you would just jam it in and never be able to remove it.
02-03-2013, 10:48 PM   #6
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I have an idea, ...how about you use a piece of plastic the size of a Cokin filter, cut out a hole in the middle, then epoxy a *lens* adapter ring in the appropriate size to that, ...you could screw your filter onto that via the front threads, and at least use it backwards. Might not be enough room to turn the whole thing front-way out, but it seems a possibility.

(And of course you can buy some better polarizers for that ready-made. )
02-04-2013, 05:16 AM   #7
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Why bother with the Cokin adapter at all if all you are using is traditional ring filters?

If you are using the other Cokin filters cut a hole in the Cokin lens cover and glue a step-down ring or cheap filter with the glass removed to it.

Last edited by Not a Number; 02-04-2013 at 05:26 AM.
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