The sensor filter stack is modified or replaced to open the sensor to visible, H-alpha and Sulphur II light. The sensor position is precisely calibrated afterwards to allow for the internal autofocus system to work properly.
Full spectrum modification
For a full spectrum modification, all filters in front of the sensor are removed or replaced with a clear glass to open it to the entire light spectrum, including UV and IR. External filters with UV/IR cut capability are required for this modification type.
Cameras are modified by removing stock filters and replacing them with a 720nm or a 590nm IR filter. Afterwards, the sensor position is precisely calibrated to allow for the internal autofocus system to work properly. Since the dust reduction element is a part of the LPF1 filter, it is also removed with the filter.
So, you’re thinking about getting your camera converted. There are so many options, but which one is best for you? Let’s find out, together!