[glend (Glen)]

The nice thing about narrowband, at least with mono cameras, is that you have the freedom to use whatever pallet you choose. With a OSC DSLR the Oiii filter will likely be green for you and that is a good thing because you have more green pixels than red ones in your bayer matrix. You have some choices with your camera settings. Canon will allow you to shoot monochrome, ignoring the colour data. This will, if shot through a Oiii filter give you an effective mono channel that you can colour layer the way you want, perhaps using the Hubble pallet one time and the more natural pallet another.. When shooting in monochrome on a DSLR, just select monochrome in the image type menu. When you do shoot the sub through an Oiii filter only that bandpass part of the spectrum will illuminate the pixels. If you shot the sub in colour it would be mostly green, depending on you bayer matrix, just as Ha and Sii will be mostly red. But shooting them with a mono camera setting, you won't get any more pixels exposed than a colour shoot but it will allow you to colourise the layers the way you choose in processing. When processing, you will need to watch the file type and convert the mono file to RGB (at keast in Photoshop), in order to colourise the layer in your choice of colours. Sorry if that confuses but its pretty simple really.