I plan on shooting a chamber orchestra and opera concert at a cathedral. It will be low light and no flash or noises are allowed. I can get the low light and no flash part covered by using a high ISO film, like 3200 (I don't mind the grain) and providing is set my lens on the widest possible f4.0 I will need no flash and can still get good shutter speed. My problem is the "no noise" part. It's a manual SLR and the shutter mechanism is pretty loud. Do I have any options other than using a Rangefinder or opting out for my terrible POS? All suggestions welcome. Thanks.