[Leica] IR photography with M8

[Simon Ogilvie]

Frank Verizon <red735i at verizon.net> wrote:
> Btw, 39mm filters are nit (were not??) available. Leica made one, but
they are hard to find

I have one of these which I use on a 35mm Summicron on my M8 to good effect
(example here: https://www.flickr.com/photos/snowy151/8686089253/)
Do you happen know what the wavelength cutoff is for that filter - I've not
been able to find that information anywhere?

Thanks,
Simon.