Since my DSLR camera is made by the same company as yours, there is one shutter setting called A-DEP, which seems better than keeping the shutter open 3-5 seconds. I'm not sure what all it does, called "aperture depth" setting, combines shutter speed with f-stop number. Other settings you can select the shutter speed getting automatic aperture, can go to f-36. But in a mode you select the f-stop number, don't think it will go that far.
I'm waiting for a similar filter as yours, blocks most of the visible light, causing digital camera or camcorders with night photography capabilities, makes this technology kick in or activate. The result is capturing the type of IR radiation from the sun, what dowsers often call "sun images" when photography is done during the day in sunlight. I've used A-DEP setting during the night in stormy weather, clouds were clearly visible in the pics. Tests at sunset and moon shots at night, on shutter held open photos they were not even close to being clear like A-DEP. My camera is #400 while yours is #450. Hopefully, will be able to get IR to work on mine. For IR photos, tests have to be made, perhaps open shutter might be best.
