I have placed an additional gige camera on the AS_Air path on ISCT6, in order to measure the gouy phase of the SRC. For reference the ISCT6 table layout is in D1201210. 

Attached is a diagram of the modified table layout, and photos of the changes.  I added two new components to the table.  I placed a 50/50 BS after AS-BS1, so that half of the beam going to the AS-Air Gige camera is sent across the table to the new Gige camera.  I am powering the new camera with the cable intended for the OMC Refl Gige camera, which is currently not being used.  In the photos, Optic A is the additional beamsplitter.  Camera C is the additional camera.  Camera D is the OMC-Refl camera from which I borrowed the ethernet cable to run Camera C.  Optic B is the beamsplitter AS-BS4, I adjusted this optic to keep the image on AS_Air gige centered.

Jim added the additional camera to the gige camera system.  This camera is Cam_17 and can be accessed through the digital video cameras medm screen.   If we want to use OMC_Refl, we can still switch the ethernet cable back to the OMC_REFL camera.

Because the power going to the AS_Air Gige camera has been dropped by 50%, we have doubled the exposure setting of this camera.  (The AS_Air camera is used to visually assess Mich aligment during initial alignment.)  The exposure of AS_Air is sett in the guardian, so I have modifed the ISC_LOCK guardian (lines 380 and 2644) and the ALIGN_IFO guardian (line 316) to set VID_CAM_18_EXP to double what it was previously (origional exposures were 1800 in DOWN state of ISC_LOCK, 18000 in CLOSE_BEAM_DIVERTERS in ISC_LOCK, and 80000 in MICH_SET in ALIGN_IFO.)  We believe this is the only effect of adding the additional camera, and does not change the IFO configuration in full lock.