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Hi Hugh.
I havd had my a7s full spectrum modified in the USA. I got both fulters removed, just leaving the cover glass on front of the chip. I didn't get a quartz glass instalment to preserve the refractive index for auto focus, instead, the chip was moved. Auto focus works on both my lenses, although the infinity focus mark has changed.
I bought a hot mirror filter from kolari vision so i can still use the camera for normal daylight photography. The only thing that is a bit of a pain at times is the dust that gets on the chip when changing lenses. When both filters are removed, the auto sensor cleaning function goes add well. So now I'm just carefull when changing lenses and i keep cleaning equipment in my camera bag for when dust spots start to be a problem in photos (usually only at high f numbers).
Regards, Josh
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