RE: Re: [APML] ST-4 question-UPDATE WITH NO RESOLUTION

[Alan Voetsch <alanv12952@yahoo.com>]

Hey Joe,

--- Joseph Schaefer <schaefer@htva.net> wrote:
>  There is one thing I have not seen mentioned yet. A few years ago I
> was having a problem with the brightness levels on my ST-4 requiring
> higher levels to detect a guide star,  until it reached the point
> that
> the full moon would only show a value of 80. The start up value went
> from 11 to 14.

Interesting. Changing the start up value from 11 to 14 is enough to
lower the full moon's brightness to 80?

> I called SBIG and they told me the value reading
> should
> be between 10 and 12.  I was able to increase the CCD sensitivity by
> adjusting the variable resistor on the CCD head (open hole next to
> cable on back of CCD head) unit the start up reading was back down to
> 12. This fixed my sensitivity problem. 

I was wondering about that little hole yesterday. Are you saying there
is an adjustable screw in it that adjusts a resistor?


>  I know my problems were more severe and you said your value reading
> was at 12 but its something to ask SBIG about. 

Really strange that no one appears to know about this. I assume that
this was something done during the day and simply adjusted according to
the start up values registering on the readout display. Do you remember
any of the specifics?

Wow, thanks Joe,
Alan




		
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