Worse case scenario -- say it is almost pitch black in there... use a tape measure to determine where you need to place your focus point (1/3 of the way into the scene, etc.). Mark your tripod leg locations with tape. Go outside and focus on the tape measure distance. Replace the camera.
Given the way most churches are, you probably won't swing or tilt but you will use a helluvalot of rise. Remember the 90/6.8 will only give you 1/2 - 3/4 inch.
If you are super-anal, get some Polaroid Type 55 and shoot at the slow ISO 50. Shoot and peel, and use a loupe on the negative. Ignore the slime and smell, use the sky or a window as your lightbox. You can check critical focus on the actual Pola 55 negative. Probably use a cheap Agfa 8x loupe, not your fancy 4x camera loupe.
Of course if you are doing 60-minute exposures on ISO 400 film you are screwed. Just stop it down and avoid earthquakes and train tracks.
This is an hour long exposure from a church balcony. The specs are the photographer's tiny flash.
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