kurja

At time of stage separation it says the vehicle is moving at 6000 kph, and a second later 24000 kph - and once back on the pad, 18000 kph. What's going on with that??

You mean that one seems to have more color?

How any raw file looks like on your screen very much depends on what software and what presets are being used to render the image. Not sure about DSS but I'd presume it's showing you the raw as linear (which would explain the lower contrast). Looking at images in file explorer? As in, just thumbnails or you opened the pics into some viewer program? Either way, you're likely to see the embedded preview jpeg (with camera presets).

What we are trying to achieve with calibration, is to record expected error sources (calibration frames) so we could remove thus quantized error from our signal (light frames). Once your data has been interpolated into a viewable image, that signal no longer exists. Lossy image file format like .jpeg being a worst case scenario really. To make matters worse, dslr cameras apply "proprietary techniques" to "enhance" the data before it is recorded to a .raw file; in many cases, bias frames can just as well be substituted with generated files of uniform values and usefulness of darks is questionable too (ymmv, case by case, matter of debate). You'll just have to try and see what works for you, and what's not worth the effort.

There you have it then. You can't really calibrate jpegs, it just doesn't work period. Always use raw - which strictly speaking isn't all that raw either... that's why people use custom firmware, or a dedicated ccd.

I would expect that to be caused by a problem in calibration, not alignment or integration, did you check that the lights were ok before stacking?

Me too, runs on 12 volts which is great but it halts when ambient is below -20 tricky to keep running in imaging use.

Snowing... Next season, I will make a photo! I got nil this winter.

New hardware - and no clouds? You must be trippin'

Is there a feature to list all threads I've posted in and have new posts? Some forums have this or similar and I find it an excellent feature.

Conveniently high elevation this time of year, many bright(ish) objects in the area, m81 and 82 show detail even on small telescopes - nice for a hobbyist. A 300mm fl camera lens even without active guiding reveals many galaxies. A plate solved & labeled picture from last year (with 300mm camera lens):

Precisely. Just like how a big truck needs more oomph&fuel to go from naught to fourty than a small scooter, even though both accelerate just as much.

What camera are you using? I was assuming an EOS?

Sure, You can exceed the 30sec limit without a timer as well, just keep the shutter button down as long as you like, on the camera or a remote. Although if he's using tethering software then it should control the shutter.

On most cameras, even modern digital bodies, electrical shutter trip is really just a short - I have, literally, triggered exposures with a paper clip. I'll be amazed and not in a good way if latest cameras now demand something through hdmi just to trip the shutter

That makes no sense to me, external exposure control is done via the usb port. hdmi should be just for streaming live view. We've been doing camera tethering long before there were hdmi ports on anything afterall edit - just took a look at backyard eos manual, you can take bulb exposures even with a serial cable

??? Why hdmi?

Higher or lower than what? Than your imaging scope? If so, lower. Guiders can do sub-pixel sampling anyway and longer is just more difficult to get working.

It's been a while but when I played with KoS the r/KoS reddit was very helpful with help and example code

Right, looks like I overlooked that impulse and specific impulse are not the same thing. Thanks

Higher Isp with same propellant mass = moar dv, more dv by adding reaction mass != higher Isp. There are other factors at play in launch of a balloon rocket, however afaik specific impulse is (by definition) the exhaust velocity of said reaction mass.

Did you mean to say that delta-v is inversely proportional to thrust-specific fuel consumption? Because specific impulse = exhaust velocity, as far as I understand..??? Edit, augmentation adds reaction mass, which at same or even lowered Isp, adds thrust. Which will mean higher total delta-v. Am I wrong?

But you see I get spoiled at midwinter, when I can set up and start imaging in the afternoon and go to bed early ;')

And remember that it's just a hobby - if it starts to get on your nerves, just put it aside for a while One year is not much time. Number of suvcessful imaging sessions I had this winter: 0. And now the evenings are not really dark anymore.. (@>60 deg latitude) Maybe next year Pixinsight has technical essays on their website, if you want more under the bonnet knowledge about astrophoto processing.

Learning curve is steep for sure. Do try to think what the bells and whistles actually do, and why doing so is useful, and you'll get more out of those tutorials. Hopefully.