×

INDI Library v1.9.6 Released (21 May 2022)

Bi-monthly INDI Library released with new drivers and bug fixes.

Driver for Raspberry Pi "High Quality Camera?"

  • Posts: 12
  • Thank you received: 1
I've found the following command line always works ok, first time, any time. Somethingabout First Mode seems rekey perhaps?
raspistill -t 1 -md 3 -bm -ex off -ag 1 --shutter 200000 -ISO 800 -st -o /home/astroberry/Desktop/long.jpg
1 year 5 months ago #66423

Please Log in or Create an account to join the conversation.

  • Posts: 47
  • Thank you received: 12
Yes, mode is the key probably. QRainman has provided me with lot of information so Ill update the code from this.
1 year 5 months ago #66425

Please Log in or Create an account to join the conversation.

  • Posts: 12
  • Thank you received: 1
OOps typo & autocorrect - meant to be "Burst Mode"!
1 year 5 months ago #66426

Please Log in or Create an account to join the conversation.

  • Posts: 47
  • Thank you received: 12
Oh, ok. That was interesting for sure. Ill see if I can find anything there.
Thanks, Lars
1 year 5 months ago #66429

Please Log in or Create an account to join the conversation.

  • Posts: 47
  • Thank you received: 12
Ok, done some testing today. Neither burst mode or hard setting a mode seems to help. Also I see that when I use raspistill to get a 5 s exposure it can take up to 45 seconds. That is really strange I think.
1 year 5 months ago #66444

Please Log in or Create an account to join the conversation.

  • Posts: 43
  • Thank you received: 10
Yeah. That one had me stumped for a while. Seems that raspistill will go through several frames (around 7 of them) before it presents the final frame to the user. Each frame is the length of the exposure time that has been set. That is the very reason for implementing raspiraw in my driver after attempting to use raspistill.
1 year 5 months ago #66454

Please Log in or Create an account to join the conversation.

  • Posts: 12
  • Thank you received: 1
Did you try the raspistill line I posted earlier?

For me, as written, the image is saved after about 1 second longer than the set exposure length. ie for a 5 second it takes 6.
If I remove the -bm, it gets a little longer.
if I remove -ex off, it does indeed get very much longer.
1 year 5 months ago #66460

Please Log in or Create an account to join the conversation.

  • Posts: 47
  • Thank you received: 12
You mean this: raspistill -t 1 -md 3 -bm -ex off -ag 1 --shutter 200000 -ISO 800 -st -o /home/astroberry/Desktop/long.jpg
Its a 0.2 s exosure, I have not had problems with that before.
1 year 4 months ago #66525

Please Log in or Create an account to join the conversation.

  • Posts: 12
  • Thank you received: 1
sorry, I pasted a random line. I can adjust the --shutter right up to 10's of seconds.

That short exposure came from an experiment I did, changing the exposure length up in steps and looking at the histogram to make sure the actual image was getting stronger.
Last edit: 1 year 4 months ago by Keith Venables.
1 year 4 months ago #66526

Please Log in or Create an account to join the conversation.

  • Posts: 47
  • Thank you received: 12
Just to make sure, when you say the image exposure does not change. You have turned of the stretch-button in the FITS-viewer then, otherwise the stretch function will normalize the exposure, with more or less noise as a side-effect.
1 year 4 months ago #67040

Please Log in or Create an account to join the conversation.

  • Posts: 12
  • Thank you received: 1
Yes - that can be a distraction!

I'm finding that if I start EKOS and go straight to the camera exposure tab, change gain first to anything 1 or higher, then change exposure to something long. It will give me a true long exposure straight away, and carry on doing so for the session.

Ive found you must not touch the exposure before the gain, as the moment exposure has been entered, a test image is captured automatically, which prevents future long exposures.

The command line I gave before still continues to be 'foolproof'.
1 year 4 months ago #67041

Please Log in or Create an account to join the conversation.

  • Posts: 12
  • Thank you received: 1
ps:

A load of messages I tried to post a month ago, suddenly appeared overnight.
1 year 4 months ago #67042

Please Log in or Create an account to join the conversation.

Time to create page: 0.286 seconds