I'm sure this has been discussed quite a bit but I'm missing something. I'm considering buying an ASI1600 M Pro with EFW vs an ASI071MC Pro. I have a pretty wide field scope and I want to use full field.
I can see the desirability of the 1600. You can select the exact correct filter for the imaging task at hand. For most exposures, the EFW glass filters are going to be more transmissive and spectrally pure. That is a real advantage. They still probably attenuate 33% of the light (or more) so exposure times are >3X that of a monochrome camera.
So now for the ASI071MC Pro- The filters probably aren't as efficient as the glass EFW filters, AND, the ASI071MC Pro have spectral 'leaks' so the red pixels have significant sensitivity to green light. All things being equal, Except for filter efficiency (unknown) either camera is going to require at least 3X the monochrome equivalent exposure. The ASI071 probably more than the 1600/EFW setup.
I would prefer to buy the ASI071 because of the effort fussing with filter wheels, but, if there is a big advantage with the 1600, I don't see it.
I'd appreciate any pointers to links or other information.
This, like much of AP, gets complicated. Really short summary.
The Bayer filter is inefficient. The colors overlap, it's dyed glass which has a lower transmission coefficient than interference filters. 50% of the pixels are green, great for terrestrial, AP, not so much. <smile>
There are resolution concerns (modified by various processing methods), and signal to noise ratio concerns.
That said, people make fine images with one shot color cameras.
The real issues arise when doing narrow band, and, to a lesser extent, LRGB. Stacking narrowband filters on top of a Bayer matrix can work (especially for H alpha), but inefficiency increases. LRGB imaging tricks your eyes, gives fine signal to noise ratio in less time. You can separate L out in processing from a one shot color camera to get some of the advantages, few do. The whole idea of OSC is simplicity.
Bottom line. Simply a personal choice. The greater your light pollution level, and/or the dimmer your targets, the more likely you'll appreciate the advantages of the mono plus filters approach.
For many (most?) the big issue is not fiddling with a filter wheel, it's cost.
Full disclosure. I own both. Even image with the dreaded <grin> DSLR sometimes.
This one image used both.
Edited by bobzeq25, 22 August 2019 - 08:59 AM.