Top/Optical Channel/Notes for Simultaneous NIR Imaging

*Notes [#f5bebb83]
There are several disadvantages for NIR imaging in the simutaneous opt-NIR mode.

- ''Degrade of image quality'' : Currently, a strong astigmatism occurs in the NIR channel
and the final image quality worse than 1.0arcsec.
and the final image quality is worse than 1.0arcsec.
The possible cause is the misalignment of the light axis (order of 0.5degree) caused by 
inserting the dichroic mirror.

- ''Lower System Efficiency'' : The total system efficiency becomes lower from 27% to 22% in
H and K, and from 20% to 16% in J.

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