Hi,
I have just spent some more time looking through analysis results that have been performed with this camera and with the 268M.
All of the 268M results are correct (~50ke , ~85ke in exteneded full well mode).
The 268C results vary, and there is a strong correlation between the results and the White Balance (Green) setting used (SharpCap measures the green channel during sensor analysis - the results don't depend on which channel you use, but mixing them up would cause problems).
When WB(G) is set to 15/16 (or more), the e/ADU and full well come out lower than expected.
When WB(G) is set to 11/12 they are much closer to the expected values.
I am relatively sure that the problem is the WB R/G/B values are the source of the extra gain that is throwing off the measurements.
Please can someone do the following test for me:
* Camera in RAW16 Mode
* Show histogram
* Set gain to medium/high
* Set exposure to 0.5-1s
* Illuminate camera well (At this point the whole image should be solid white - strongly over exposed).
* Now turn down all the WB(R/G/B) controls to 10 - look at the histogram. See if the big spike is at the 100% point on the right, or further left (like in the image below)
![Capture.JPG](./download/file.php?id=4938&sid=c7cbe2a9abfd513cc48526adfc7287e0)
- Capture.JPG (115.61 KiB) Viewed 2070 times
If the big spike is at 100%, try again with all the WB(R/G/B) values reduced by 1 (ie 9/9/9). If the big spike is to the left of 100% as shown in the image, try again with all the WB(R/G/B) values increased by 1 (ie 11/11/11).
We are not aiming to get a nicely colour balanced image here, just find the values where the histogram spike for an over exposed image is at the far right. In fact the result I need to know is the smallest value of WB(R/G/B) that moves that spike to the far right. It might be 11 or 12 or 15 or 16.
For my 294 it happens with all the WB values set to 16
![capture2.JPG](./download/file.php?id=4939&sid=c7cbe2a9abfd513cc48526adfc7287e0)
- capture2.JPG (54.21 KiB) Viewed 2070 times
If that value turns out to be 11 or 12 then we have found the cause of the problem.
If it turns out to be 15 or 16 then there is more head scratching to do!!
thanks,
Robin