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Hi Marc
The distance from the chip to the front face of the camera is 15mm. The nose piece adds 12mm to give you 27mm from chip to front of nose piece. This is without taking into account the extra distance added by the glass filter in the nose and the glass plate that covers the CCD chip itself (some argument over whether its relevent or not but I dont bother and my spacings work fine). The camera will run happily without the nose piece with the only difference being a higher TEC draw to achieve required temps. The CCD chamber is sealed and nitrogen purged and as I read it this is a seperate entity from the space sealed by the nose piece. The heating ring sits on the top board (nearest the camera face) and warms the air in front of the CCD chamber to prevent dew forming on the UV/IR filter mounted in the nose piece. You can also use the desicant plug if need be. Hope that helps.
Mark
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