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Entry  Mon Nov 5 19:38:52 2012, jamie, jenne, ayaka, den, Update, Alignment, more alignment woes 
    Reply  Tue Nov 6 16:38:37 2012, jenne, jamie, ayaka, manasa, Update, Alignment, Alignment back under control again 
       Reply  Tue Nov 6 17:07:04 2012, jamie, Update, Alignment, AS and REFL tmp6oTENk.pngtmplamEtZ.png
       Reply  Tue Nov 6 17:22:51 2012, Manasa, Jamie, Update, Alignment, Alignment- POY and oplevs 
          Reply  Wed Nov 7 00:10:38 2012, Jenne , Update, Alignment, Alignment- POY and oplevs. photos. 
             Reply  Wed Nov 7 07:11:10 2012, rana, Update, Alignment, Alignment- POY and oplevs. photos. 
             Reply  Wed Nov 7 09:09:02 2012, Steve, Update, Alignment, Alignment- 9amNov7w.png
                Reply  Wed Nov 7 15:17:15 2012, Steve, Update, Alignment, steering option with pico motor? IMG_1795.JPG
Message ID: 7678     Entry time: Wed Nov 7 07:11:10 2012     In reply to: 7677
Author: rana 
Type: Update 
Category: Alignment 
Subject: Alignment- POY and oplevs. photos. 

The way to usually do image subtraction is to:

1) Turn off the room lights.

2) Take 500 images with no beam.

3) Use Mean averaging to get a reference image.

4) Same with the beam on.

5) Subtract the two averaged images. If that doesn't work, I guess its best to just take an image of the green beam on the mirrors using the new DSLR.

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