IR Filter to fit Cokin P

[jd callow]

I need an IR filter to fit a Cokin P holder with a transmissive range of ~700-820nm. Is there a Cokin filter or an inexpensive alternative?

Thank you in advance.

 

[keithwms]

How about a kodak wratten gel?

But the Cokin design may not be light-tight enough without some amendment, I dunno.

 

[jd callow]

That is a good back-up plan and I've seen them on ebay for relatively little money. I have found them to be problematic (easily damaged, wobbly, etc...) in the past and would prefer a solid filter.

 

[EmilGil]

http://www.bhphotovideo.com/c/product/387080-REG/Cokin_P007_P007_Infrared_Resin_Filter.html

 

[thebanana]

JD, I have the Cokin filter that EmilGil has linked to. There is no information in the packaging as to what the transmission factor is, but maybe the Cokin website has it. It's a solid glass filter.

 

[jd callow]

http://www.bhphotovideo.com/c/product/387080-REG/Cokin_P007_P007_Infrared_Resin_Filter.html

I'm a dope I thought cokin made one, but my initial search came-up empty. Why I did't look on B&H is beyond me.

Thanks.

 

[Dinesh]

I'm a dope ....... Why I did't look on B&H is beyond me.

Thanks.

Asked and answered baby, asked and answered!

 

[Fotohuis]

Close to 89B filter. It's in fact the same as the SFX filter.

 

[thebanana]

It's in fact the same as the SFX filter.

Possibly, but when I look at the gelatin SFX filter that came with the SFX promo pack, alongside the Cokin glass filter, the SFX filter allows more visible light through.

 

[Fotohuis]

According the information on www.cokin.com:
http://www.cokin.com/ico6-INFRARED-FILTER.html

50% transmission at 720nm and indeed a 89B filter.

 

[DaveOttawa]

I need an IR filter to fit a Cokin P holder with a transmissive range of ~700-820nm. Is there a Cokin filter or an inexpensive alternative?

Thank you in advance.

A relatively cheap way to get one might be to buy the Ilford promo pack of 3x 35mm SFX film + P sized filter, see how that compares to the price for the filter alone.

 

[Fotohuis]

In case you want a high quality I.R.-glass filter:
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They have the whole range IR filters from 665nm, 695nm (89B), 715nm (88A), 780nm and up.
Most universal is the 89B or 88A which can be used on all produced IR films at the moment: Kodak HIE, Rollei IR820/400, Efke IR820, Ilford SFX 200. They even have Bayonet filters for TLR cameras (Mamiya C220/C330, Yashica Mat (124G), Rolleicord, Rolleiflex).

 

[Toffle]

I have considered the cokin IR (007 IIRC) but I am concerned that there would be too much light spilling around the edges. (I know that is probably more in my mind than anything, as I have used the Cokin system without fail for years) I also seem to recall that they are something of a Yeti in the eyes of some camera dealers; some claim to have heard of them, but I haven't found anyone yet who has actually seen one.

If you (or anyone) actually gets a Cokin 007, let us know how they work out.

Cheers,

 

[DaveOttawa]

Yeti spotted

I have considered the cokin IR (007 IIRC) but I am concerned that there would be too much light spilling around the edges. (I know that is probably more in my mind than anything, as I have used the Cokin system without fail for years) I also seem to recall that they are something of a Yeti in the eyes of some camera dealers; some claim to have heard of them, but I haven't found anyone yet who has actually seen one.

If you (or anyone) actually gets a Cokin 007, let us know how they work out.

Cheers,

A yeti?? I have one, bought as part of the Ilford sfx promo pack from www.bigcameraworkshops.com in Burlington, ON so they do exist. Henrys may carry them as well but they don't sponsor this site!
Not sure what you mean about light spilling round the edges, it goes in straight lines AFAIK, no spilling, at least not that I've noticed with the P007 filter. FYI it's essentially a gel like filter (in appearance at least) in a plastic frame that fits the Cokin holder. Will not be as durable as the glass ones referenced above I'm sure but probably cheaper and lighter.

 

[Toffle]

Not sure what you mean about light spilling round the edges, it goes in straight lines AFAIK, no spilling, at least not that I've noticed with the P007 filter. FYI it's essentially a gel like filter (in appearance at least) in a plastic frame that fits the Cokin holder. Will not be as durable as the glass ones referenced above I'm sure but probably cheaper and lighter.

As I said, it's probably more in my mind than anything. Apart from a few self-inflicted scratches, I have had no problems with various Cokin filters over the years. As for the Yeti comment, I have had more than one person stare at me from across the counter when I've suggested that bigfoot... I mean P007 really did exist. :rolleyes:

Frivolity aside, how do you find the Cokin IR performs? Up to now I've been using a dark red (Cokin 003) with... um, predictable results... which is to say, barely a hint of what I'd be getting if I actually used the proper equipment.

Cheers,

 

[Fotohuis]

Up to now I've been using a dark red (Cokin 003) with... um, predictable results...

With this filter you will have some 'wood' effect with HIE only.

For ALL other IR films you need at least the 89B filter.
Here some examples with the SFX, Heliopan RG715 (88A) and Hoya 72R filters on Rollei IR820/400:

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[Mike Kennedy]

I just cut the Ilford SFX filter and placed it between the film rails of my Nikon FE.Used 2 very small bits of tape to secure it in place.
So much easier to compose your shot without a filter getting in the way.Rated Kodak HIE at 50 as suggested by a few APUG members.I shall post my results in a few days.

Mike

 

[nworth]

How about a kodak wratten gel?

But the Cokin design may not be light-tight enough without some amendment, I dunno.

I seem to recall that there is a frame for 3 inch Wratten squares that fits the Conkin system.

 

[keithwms]

I seem to recall that there is a frame for 3 inch Wratten squares that fits the Conkin system.

I think the issue most people have with the gels is that they are a bit flimsy, and the slightest leak can destroy an IR photograph.

Perhaps a gel could be mounted on a clear glass or as a sandwich to protect it. But I personally wouldn't go the gel route unless cost is a very serious issue i.e. for a really large filter size. I was considering this as an alternative to a ~150mm filter, for example.

 

[nworth]

I think the issue most people have with the gels is that they are a bit flimsy, and the slightest leak can destroy an IR photograph.

Perhaps a gel could be mounted on a clear glass or as a sandwich to protect it. But I personally wouldn't go the gel route unless cost is a very serious issue i.e. for a really large filter size. I was considering this as an alternative to a ~150mm filter, for example.

That's why you use the frame. The frame is a metal or plastic holder that allows you to handle the filter without touching it. Yes, gelatin filters are fragile, but they hold up a long time if you handle them carefully. Some commercial filters are made by carefully cementing gelatin filters between sheets of flat optical glass. (Tiffen comes to mind, and Kodak used to do it this way.) The quality of the glass for these applications is very critical.

 

[wirehead]

Some commercial filters are made by carefully cementing gelatin filters between sheets of flat optical glass. (Tiffen comes to mind, and Kodak used to do it this way.) The quality of the glass for these applications is very critical.

I think that's long in the past. Tiffen puts a dye in a cement spread between two sheets of glass. And Kodak... well.. any Kodak filters are probably made by Tiffen at this point.

OTOH, gel filters in frames are not that bad. Although the gel ones are quite content to dissolve whenever you get them wet and the polyester ones need to be placed behind the polarizer.