Were you using a lens, or doing prime focus? For the K-70 at least, the SDK provided by Ricoh does not expose certain settings unless it detects a lens on the camera that supports those settings. I'm sure whoever decided on this limitation thought they were doing the user a favor by only exposing settings supported by the lens, but obviously they were not thinking about prime focus. Anyway, this means that PTP mode is severely handicapped if you're doing prime focus. Much to my frustration, I did not discover this until after I had already developed the PTP driver, as I probably would have started with MSC mode only had I been aware of the limitation.
The Ricoh SDK does not support bulb mode for PTP with the K-70 (or any camera, I suspect).
I use my M200 f4 lens, manual prime.
For me, ISO is not that important, I tend to stick to ISO800.
@Noideadoeaname, you should be able to use your K-70 for proper polar alignment, I don’t know if 1-2sec exposure time is sufficient, if not, it will be difficult to control.
No. There are not enough hours in the day, unfortunately. I did respond to the pixel size issue on GitHub. I think it's technically a KStars/Ekos issue, not a driver issue, but the driver could probably be enhanced to supply the values for the K70 so as to avoid the issue in the future.
I had done some initial profiling a while back to see how much time FITs conversion was taking on the Pi4. I was surprised to find it taking less than a second, which is a big improvement over the Pi3 and probably attributable to having more memory available. Unfortunately, this means that clipping and/or downsampling before FITs conversion is unlikely to help much--the bottleneck right now appears to be the transfer from the camera to the Pi4. I'm going to look into it one more time just to double check, though.
Since you are asking Karl
If we could have an exposure start pulse and an exposure stop pulse, that would make the day for K-70 users. It should be a feature you can activate/deactivate in case you use a camera like the KP or K-1 which is supposed to be working with the Pentax SDK.
I don't have a K3-II for testing. I wouldn't object to having one, of course, but my wife thinks the money would be better spent elsewhere
I think someone else was having some issues with the K3-II as well. I can't recall where that conversation ended up, but I think the issue was related to this thread: github.com/asalamon74/pktriggercord/issues/25. So perhaps try astrotracer mode instead of bulb, and make sure that bulb mode is in press-hold mode? Oh, and just in case, make sure you're in MSC/MFT, because I suspect PTP does not support bulb on any camera.