Infrared with the M system

TimCastleman wrote:

Thank you, what filter did you go with? I'm thinking the 590.

The filters I use on my full spectrum converted M200 are mentioned in the various images I've posted in this thread, but to summarize:

Hoya Red 25A filter - this is very similar to the 590 nm 'super' or 'ultra' color filter the conversion vendors like Kolari Vision and LifePixel sell, but are widely available new and used. The Hoya red 25A filter passes IR very well but its visible light cutoff is slightly closer to the infrared, so it appears to be 'red' visually as opposed to the 590 nm filters which look more orange

Spencer Camera 590 nm filter - similar to the Kolari Vision and LifePixel 590 nm filters. Foliage appears a little more 'yellow' saturated (when images are red/blue channel swapped) -- I am finding I seem to prefer the 25A filter and use it more

Hoya R72 filter - shows a little color but mostly more contrasty, more B&W rendering

Spencer Camera Visible + H-alpha filter - I got this filter for astrophotography but found it works pretty well also as a normal visible light filter, like a hot mirror filter, although you have to use a custom white balance and colors are more 'rich' and Velvia-like

Just today I ordered a Tiffen Hot MIrror filter as they were deep discounted for a brief time on Amazon Prime sale ($50 - $100 off for some reason). I expect that filter to be quite similar to the Spencer camera Visible + H-alpha filter, after reading a lot of comments that it seems to let a little more IR light through than the Kolari Vision or LifePixel hot mirror filters.