Re: RAPAS on Mach2
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“Hi Wade, peace.. just trying to understand.”
No problem. Likewise, I’m just trying to offer some suggestions.
I tend to be overly verbose when I write, which probably overcomplicates things. It probably wasn’t clear, but I’ve ever even used an eyepiece with my two main imaging scopes. Everything that I’ve suggested is intended to be “imaging rig friendly” and fairly simple to do.
Regarding your previous attempts to image unguided, what kind of scope are you using? I do most of my imaging with an EdgeHD 8, and I simply cannot do unguided imaging with it with any kind of regularity. The issue is that the primary mirror just has too much movement, even with the focus clutches locked. There is obvious star trailing after 3 minutes, and 5 minute subs are completely unusable to me. I have to use an OAG. An APPM model doesn’t really help a lot with this because the mirror movement seems to be non-repeatable.
When you do an APPM run, how much of the time is spent waiting for the image to download? I was using a CMOS camera with USB 3 downloads for a while, and it would download a 1x1 frame in just a couple of seconds. My current camera is a CCD with USB 2, and it takes a *long* time to download a 1x1 frame. To mitigate this, I do 5 second exposures with 2x2 binning whenever I plate solve (either inside of SGP or with APPM). That speeds things up considerably. I spend less than an hour to get 100-150 points. I suspect that your DSLR can probably download a lower resolution as well. The last time that I binned a DSLR was many years ago with a Canon 20D, and it lost the Bayer matrix information when binned 2x2, but that was no big deal for plate solving.
My personal opinion that is unguided imaging is not something that interests me much. It takes me about an hour to really dial in a new guider (what with focusing through my OAG and such), but once I’ve done that, it’s all automatic. Since I always set up with the camera, OAG and guider at the same orientation, I don’t even need to recalibrate the guide software after setting up.
From: firstname.lastname@example.org <email@example.com> On Behalf Of Terri Zittritsch
Hi Wade, peace.. just trying to understand. Like I said in my original post, it may be that I'm just seeking something that isn't really practical or possible. I have a full guiding setup, but when I get these posts using encoder mounts or my mount, showing incredibly flat controlled tracking, I'm trying to see if I can achieve this as well.