I am an engineering student and I’m working on a project where I need to submerge a lens system and camera sensor in mineral oil. I have a c mount lens kit as well as a raspberry pi and its sensor. I’ve disassembled and reassembled two of the lenses under oil to fully fill them as well as immersed the sensor. the sensor and lens appear to work but I cant get them to focus. I know this is due to the fact that mineral oil has a far higher refractive index than air but I was hopeful with a large enough focal range I would be able to adjust the stock lens to adjust for the difference. any ideas on how to overcome this?