Canon cameras are modified by removing the LPF2 filter to open the sensor to H-alpha light. The LPF1 filter is retained and it acts as a UV/IR cut filter and the dust removal tool. 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 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. Popular camera models for this modification – Nikon D5300/D5500/D5600, any Canon camera.
Canon APS-C sized cameras are modified by removing both the LPF1 and LPF2 filters and replacing them with a high quality 720nm 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!