Suggested starting exposure times in H-band mode for an H-magnitude=5 is 45 seconds when observing with a coronagraph.
The zero-point of each channel in H-band mode is given below, the max zero-point is J = 17.4 mag.
![Zero Point H](/sites/g/files/toruqf4741/files/styles/freeform_750w/public/charis/files/fk28aaabzge4laacwbuilaacwbuilaacwbuilaacwbuilaacwbuilaacwbuilaacwbuilaacwbuilaacwbuilaacwbuilaacwbuilaacwbuilaacwht8b9fcobni5jdyaaaaasuvork5cyii.png?itok=MHtOkIbd)
The curve below shows the 2-read saturation limit with no coronagraph. The maximum allowable magnitude to avoid saturation is J = 6.8 mag
![2 read saturation, H, no coronagraph](/sites/g/files/toruqf4741/files/styles/freeform_750w/public/charis/files/unoccultedh.png?itok=X0axm-5j)
NOTE: Throughput of SCExAO rebuild and AO performance on any particular night will affect these numbers. Strehl ratios of 60-80% were estimated when this data was taken