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Infrared with the M system

Started 8 months ago | Discussions thread
petrochemist Veteran Member • Posts: 3,616
Re: Finding discounted infrared filters
3

With my full spectrum cameras I've found a fair number of old photographic filters can work well. Practically any of the red/orange yellow filters for black & white film will be long pass filters equivalent to high color/super color etc.

Blue & green filters are much more variable not all pass IR & this can vary between filters supposedly of the same type. Some that have worked well on one occasion have been quite useless a few months later (possibly from varying IR in the sunlight)

A variable ND can be very good allowing the visible portion to be adjusted while constantly seeing ~800nm plus (stacked with appropriate coloured filters the affect is the same as the variable wavelength filters on e-bay)

I'll try any strongly coloured filter I come across (colour correction & warming/cooling types tend to be too weak)

A few types of 'technical glass' can be effective too, but many of these are hard to get in sizes above 50mm, tend to come without any mounts & don't have guaranteed optical flatness. Still my 25mm Schott BG3 & U330 filters have worked well on lenses small enough for them to cover. They were among a set from work that were no longer used

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