Infrared photography questions - focus shift and ND filters

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Auf Reisen Contributing Member • Posts: 817
Infrared photography questions - focus shift and ND filters

So i have dabbled with IR photography for a bit, using an old converted Panasonic MFT camera (to 690nm I believe).

It's been great fun but I have run into two problems:

1) I cannot focus to infinity with my Samyang manual focus lenses. I know that there is a focus shift with IR light, but I simpyl cannot focus any further with those lenses. And stopping down too much quickly induces diffraction. Any way around this?

2) I very often have a problem with too much light reaching the shutter speed limit on my camera. This often forces me to stop down way too much. Can I use normal ND filters to cut down on the light or do they have to be special IR filters?

Thanks!

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