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No. What I do is: I get the disc central on the camera chip, I add a heap of gain until I get a burnt/blown out section on the screen, I then tune the filter until I get the smallest section (it's round of course) of burn out & then this PST is tuned. In my case I'm not in control of WHERE on the SUN or FOV it is. Just so happens this burntout section is slightly off centre, but the standard 6 pane mosaic fixes it.
Naturally I turn down the gain again before shooting!
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