[lm-announce] LMF DV3

[Sam Swift]

Dear All,

Some of you have experienced intermittent problems when using the LMF  
DV3.  The problems and fixes are as follows -

1.  Choice of dichroic - the dichroic mirrors are moved with a slider  
beneath the objective turret.  The "furthest in" position is the QUAD  
filter, followed by JP3 and then JP4.

2.  Camera lines - the camera occasionally produces lines in the  
image.  If the problem persists after the room lights are turned off,  
please restart the instrument controller.  If this still doesn't  
help, contact me, Calum Thomson or Paul Appleton and we will restart  
the camera.

3.  Missing a large area of the field of view in the acquired image -  
the DV3 occasionally "forgets" where the filters are supposed to be.   
If a filter is not in its home position, you may only see part of the  
image that you acquire (i.e. the camera filter wheel is not  
positioning correctly).  A similar thing can happen with the  
excitation wheel (the wrong colour light might come through, or the  
filed of view down the eyepieces will appear unevenly illuminated)  
and the ND wheel (it looks too dark, too bright etc).  All of these  
problems will be resolved when you restart the instrument  
controller.  Should this not solve the problem, we can manually  
relocate the filter home positions for you.

Thanks,
Sam