Later this week, I'm going watch the morning (6 a.m.) liftoff of about 30 hot air balloons at a local show. Local sunrise is about 5:30 a.m. I have no idea how to shoot the balloons against the early morning sky. Here's the equipment I have available: Bronica SQ Ai with a TTL prism finder 80mm and 150mm lenses (no w.a. lens) and a 2x teleconverter Luna Pro F with 2.5° spot metering attachment Red 25A filter Delta 100 and Delta 400 film SFX200 infrared (which I've never used for lack of an IR filter) My main concern is how to meter and whether the red 25A filter would be useful.