High speed camera? Jan Mánek Czech Astronomical Society. ESOP XXXIII, Prague, CZ, August 30-31, PDF

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High speed camera? Jan Mánek Czech Astronomical Society ESOP XXXIII, Prague, CZ, August 30-31, 2014 (important is the L and mono) 1/3 APTINA CMOS MT9M034 sensor with maximum sensitivity at ~550nm (rather

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High speed camera? Jan Mánek Czech Astronomical Society ESOP XXXIII, Prague, CZ, August 30-31, 2014 (important is the L and mono) 1/3 APTINA CMOS MT9M034 sensor with maximum sensitivity at ~550nm (rather different from commonly used Watec cameras) physical chip size 4.83x3.63mm pixel size 3.75x3.75 microns connected and powered via USB (2.0 is speed minimum) 45g without parfocalising ring fully digital output, no A/D conversions maximum image resolution 1280x960 pixels minimum image resolution 320x240 pixels optimal for asteroid occn. is 2x2 binning mode giving 640x480 resolution and 12-bit can work at up to 200fps in 8-bit mode, 100fps in 12-bit fps is related to the recording image resolution and bit depth : larger image size - lower maximum fps recording at 200fps can be done only at which is a small central part of chip cutout not cooled recording software EZplanetary can record to multiple file formats, for occultations are interesting uncompressed AVI, or SER (or FITS) files can apply on-the-fly dark frame correction inserts time directly into the video image and inserted time is end of exposure time inserts currently wrong fps into AVI files and no fps/exposure/bit depth info in SER files recording software EZplanetary both AVI and SER output formats may be processed with latest Tangra3 (3.1.10) in usual manner Limovie can process these AVI files too Limovie reflects and correctly uses the high fps in diffraction fits OccuRec of Hristo Pavlov can also work with the camera, but NTP time insertion is somewhat problematic now (at least for me) ? time? EZplanetary inserts time directly into the video image and inserted time is end of exposure time I have free running PC time, which is NTP monitored, so I have an offset to apply to inserted times I've made checks so I'm quite sure about accuracy of inserted time to be at 5ms or better - ON MY TWO SYSTEMS ONLY! ? time? Current knowledge/pitfalls I have no certainty of how good/stable will be time on other PC systems it's important NOT to set PC time during/around the recording, to have enough data and smooth NTP offset info AVI recordings have wrong fps internally, before processing them a change of fps should be done in VirtualDub if further Limovie evaluation is needed Current knowledge/pitfalls I see frame dropouts and inserted time seems to shows some jitter, one must be very cautious with evaluation I've added camera's MT9M034 chip sensitivity curve to CCDSpectralSensitivity.csv for Limovie diffraction fits NTP offset monitoring is done via NTP monitor to be found here Current knowledge/pitfalls field size for full chip is 20.5'x15.3' at 810mm focal length field size for 320x240 is 5.1'x3.8' only at 810mm focal length Current knowledge/pitfalls Current knowledge/pitfalls Current knowledge/pitfalls at 200fps the limit for evaluation on my 8 Newton is around 7th mag I have recorded and reported several double stars at 50 to 200fps with 200fps are opening new horizons where diffraction effects play the role instead of step effects at component separations smaller than ~60ms for total occultation the important limitation at high fps rates seems to be scintillation on small telescopes Current knowledge/pitfalls Current knowledge/pitfalls Current knowledge/pitfalls Current knowledge/pitfalls I see high potential, but many problems too At this moment I can't say this camera is a general WOW to be used by everyone, there are real problems to keep eye on cropped video : 200fps- 20fps similar cameras ASI120MM Mono Celestron Skyris 132M possibly some other using the same chip or providing same fps and image parameters
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