Foreword: Consider this image and its publication being of a more documentary nature.

Some background: my stock DSLR will be the camera for travel, especially if it's for vacation and flight travel. It would be used for daylight photography but also for astrophotography in combination with "short" focal length lenses (50mm and below). Therefore, I'm doing some tests and this image is one of them. Especially for traveling south, where the galactic center is much higher in the sky, I am interested to collect nebula data.
Although the camera not being blind to Ha, I need to optimise the setup for nebula regions, especially if they are located amidst the galactic disk. My plans are to use a filter which blocks most of the unwanted light (if it's the broadband stars or light pollution). For this very purpose, I chose the Astronomik UHC filter. First, it's transmission characteristics allows to pass OIII and plenty of Ha signal. Since the camera's transmission spectrum blocks most infra-red signal by design (and somewhat undesirably a lot of red signal), the fact that the UHC doesn't block IR isn't of any drawback.
Second, with the clip-in model, I can easily use it with essentially all equipment combinations. Be it the APO refractor or the normal camera lenses.

In order to get acquainted with this filter and camera combination, I chose to use it on a fairly bright target using my William Optics ZenithStar refractor. Due to my professional background, I'm always trying to use a quantitative model-based approach and therefore chose to set the camera ISO to 400, which I believe is the sweet-spot w.r.t. read noise and dynamic range. (ISO 100 and 200 would in principle also be an option. However, at these "speeds" the camera shows some banding effects which are nearly impossible to get rid of in post processing). For the exposure times, I've selected 300seconds for each subframe.
I had planned to collect two to three hours of data to be included into the final image. However, as expected from the forecast, clouds came in and I had to stick with 1:15h of total data (all subs usable).

I did my typical calibration workflow which contains Flats and Bias frames only. I don't bother about dark frames anymore. The dark signal is sufficiently homogeneous for most cases so that it's essentially behaving as an offset if enough light frames are collected. Worth to mention: dithering is an absolute must in that case.

With the data at hand, I did some fairly aggressive post-processing to bring out the [OIII] and especially Ha signal. Of course, one pays a price for that and so the quality is not superior. As I said in the beginning, it's a documentary image and more of an experiment and not so much a pretty picture for broad publication but maybe this experience is useful for you and encourages you to do some experimentation yourself.

From the current results, I believe that decent results can be generated with this combination and so in the near future, I am planning the use of the camera and filter with a regular camera lens (maybe the nifty-fifty).

As usual feel free to give feedback.

Björn