Found this for an all sky view recorder for a raspberry pi. It’s from 2016 and they mention ASI224MC and ASI120MC cameras and use an Arecont 1.55 wide angle lens. A whole sky view may not have enough resolution but are the cameras any good? Bill > On Jul 11, 2019, at 6:45 PM, C. Bassa via Seesat-l <seesat-l_at_satobs.org> wrote: > > Hi Andreas, > > On Thu, Jul 11, 2019 at 8:08 PM Andreas Hornig via Seesat-l > <seesat-l_at_satobs.org> wrote: >> in the last email for our StarLink and NOAA I wrote I did not find any >> "simple and small budget" solution for optical sat tracking. >> It turned out I found one on Raspberry Pi and Raspi Cam basis >> http://shortcircuitsandinfiniteloops.blogspot.com/2017/10/raspberry-pi-skycam-w-noir-v2-camera.html >> >> I would be intrigued to build one, because I, by chance, have a spare >> Raspi. But before I start I would like to ask a few things: >> >> Do you think the infrared raspi cam described in this article will work to >> provide usefull obervation for SeeSat-L? > > The noir RPi camera is not sensitive enough for meteor work. I'm > experimenting with CMOS cameras, in particular the ZWO ASI178MC, and > that appears to work about as well as a Watec 902H2, though it is > slightly more expensive. In the meteor community people are looking > into cheap USB CCTV cameras using the IMX291 and IMX307 chips, but I > have no experience with those. > >> How do you calibrate them to know the attitude of the FOV? >> I would attach a simple IMU from aliexpress that measues the magnetic >> direction and the gravity vector. So I can determine to a certain degree >> the orientation of the camera towards zenith. And also with the geo >> position (manual or by gps) I can determine the difference between magnetic >> north and north. >> But how "precise" does the calibration need to be? Or how do you do yours >> with your equipment? > > The astrometric calibration, linking pixel coordinates to sky > coordinates, needs to be as accurate as it can be. If the camera is > relatively free of defects you don't even need to know where you point > as astrometry.net will be able to solve the astrometry for you. If the > camera and lens combination is also free of distortion, that should be > precise enough for the astrometric calibration. > > Regards, > Cees > _______________________________________________ > Seesat-l mailing list > http://mailman.satobs.org/mailman/listinfo/seesat-l _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-lReceived on Fri Jul 12 2019 - 16:02:26 UTC
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