$599 Full Spectrum (UV+VIS+IR) Sony A6000 + 3 58mm filters the best camera for infrared photography!
I replace UV-VIS-IR cut original filter stack with MC BBAR coated Spectrocil 2000 clear window. This replacement filter has transmission window well wider then what sensor is sensitive to!
So basically you remove limiting filter from in front of the camera sensor and replace it with clear window that allow sensor to see everything it can.
Focus is being recalibrated. Some say it is not needed for mirrorless cameras. Good luck focusing ultra wide lenses then
In case you like to take regular color photos you would need to use IR Cut filter + color correcting filter. Something similar to Hoya CM -500
I do provide this type of filters as well.