Many thanks for this very interesting discussion about IMX432 and Mallincam DS432M !
I desperatly search for a measurement in "real life" of read noise in HCG gain on a
camera like DS432M.
No information coming from Sony. Only informations are given by ZWO/QHYYCD and
FLIR for older Prgius generation and 3rd one for the 4.5 micron familly :
Nothing for the IMX432 sensor.
About Read noise, to summarize quickly the informations available :
- 1st generation- IMX174 and IMX 249 - 5.9 microns pixels -
Read noise : nearly 6 e- for LCG and nearly 3 e- in HCG
- 2nd génération - IMX250 and others - 3.45 microns pixels -
Read noise : ?? e- for LCG and nearly 2.5 e- in HCG (FLIR measurement)
- 3rd génération - IMX420 and others - pixels de 4.5 microns -
Read noise : nearly 6 e- for LCG and nearly 3 e- in HCG (FLIR measurement)
Now, what about IMX432 with 9 microns pixels ?
If the Read noise is the same as for 4.5 microns other sensors, nearly 3e- in HCG
mode, this sensor is really a good candidate both for EEA and DSO short exposure DSO !
For higher values, well... I will forget it I guess...
The link given by OleCuss to Framos website is very interesting. So it's a binned
version of IMX428. Why not ? IMX294 is a quad bayer and is a really great sensor (I
have a QHY294, best color camera I never have for short exposure DSO imaging).
If dynamic range is 76 dB for classical 4.5 microns sensors and 86 dB for the
binned 2x2 9 microns pixels with 100 ke- full-well capacity, the theorical value
for read noise is :
RN (IMX432) = 100000 / 10exp(86/20) = 5 e-
Logically should be in LCG. Is it true ?
Impossible to say if it's good news at first sight...
Need to be confirmed by measurement on a real camera in LCG and HCG mode.
And since there is a chance the IMX432 is using the same kind of clunky/noisy binning used with the IMX071 sensor (if you mistakenly turn it on), the IMX428 may actually give you a better SNR than does the IMX432!
Remember that IMX071 is an "old" sensor. It's the hope... We really need measurements on existing Mallincam or Touptek or Explore Scientific cameras to conclude !
About QE value, all these sensors are between 65% and 70% at 530 nm. So I guess it's
exactly the same for IMX432.
Concerning a QHYCCD camera using this sensor, yes they are planning it, Qiu has
answered on QHYCCD forum :
I hope they will post the read noise curve, to have all answers to our questions !
Edited by XS_Man, 16 November 2019 - 11:08 AM.