I ordered me a ASI1600MM Pro camera along with the 7 position filter wheel. I'm wanting to move from a OSC to Mono in my imaging and have a couple of questions.
The filter wheel comes with LRGB, HA, Oiii & Sii filters. I've seen people do post with using just the LRGB and maybe adding HA to the mix. Here are the questions.
1. When shooting LRGB, what is the Luminance filters purpose?
2. I've seen people post images using LRGB + HA for details. But I don't thing I've seen anyone use LRGB+HA+Oiii and Sii. I'm gathering that when shooting LRGB you don't really use the other 3 and vice versa when shooting HA, Oiii & Sii your don't shoot or need to shoot with the other 4 filters. Am I assuming correctly.
3. Does anyone have any sound advice for someone starting to shoot Mono that won't make there head spinning in 5 directions at once?
Thanks in advance.
1. Luminance is the main part of the image. Your eyes see detail in black and white. The RGB are basically used to "paint" the luminance. Advanced processing will process the L differently. It may be sharpened, and other things. The RGB data can be noise reduced more, your eye will ignore the reduced sharpness. It gets more complicated than that, obviously.
The reason LRGB works so well is that, when you take the L frames, you are using all the pixels on all the light, all the time. That greatly improves signal to noise ratio, allowing for things like more sharpening.
The downside is that L inevitably decreases color (simple math), so you have to boost it, and the process is not perfect. Straight RGB is preferred for the best color, but it takes _much_ more total imaging time.
2. There's no reason you can't add other narrowband channels, but the processing gets very complicated.
3. Start with simple LRGB, no narrowband. Use either the tutorials of your choice, or better, a book like this one (the best I know, and my bookshelf is extensive).
I'd use APP at the start. The book above uses PixInsight and Photoshop for examples of processing, but the basic material also applies to APP. This is much simpler than adding learning PI to your load. If/when you do go with PI, this book.
Don't sweat the time differences with L,R,G,B, too much. The RGB filters will require about the same subexposure as your OSC did. The L, about half that. For total imaging time 3:1:1:1 is a good place to start.
When you've got it working, the postgraduate course in processing can be found here.
Edited by bobzeq25, 14 February 2020 - 11:55 PM.