Small IR filter for mobiles?

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Name
Suz
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I've been messing around with a hoya 720nm over my phone and it is much easier to get half decent IR shots with it as obviously the IR side isn't anywhere near as attenuated with a cheapo mobile sensor as with a proper dslr sensor. Big advantage is that the phone's screen viewfinder works through the filter.

I can't seem to find any small IR filters for phones that don't seem to be on dodgy websites going on about seeing through people's clothes (a myth I assume)

The hoya 62mm is a bit on the large side. I could do with a rectangular filter that would clip over the raised camera section. Does such an item exist?

I heard you can also use fully exposed negative film over the sensor. Does that actually work? That would be easy to use as I must have the odd frame that I could use. Would it matter whether it was colour or black & white? With this I'm also wondering what weird and wonderful patterns you'd get with a partially exposed frame where the IR and daylight would mix.
 
Yes, the negative film does work. :)
I have a £25 Praktica Dpix 5201g with the cut filter replaced with four layers of the stuff (I encountered overexposure problems with one layer).
It does have occasional problems with auto white balance (no custom) causing the images to have a purple tint, but a B&W PP conversion cures that.

Sorry I can't help you with clip-on phone filters; I've never looked for one.
 
Glad the negative trick works. Will see what I can do with bits of plastic and sellotape :thumbs:
 
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