Re: [APML]: Newtonian or Schmidt-Cassegrain for astrophotos?

[Wil Milan <wmilan@airdigital.com>]

TVC is a means of backlash compensation, usually on the declination axis. The
way it works is that when you apply a correction in a direction opposite of
the last correction, the TVC circuit first drives the drive motor a maximum
speed for a fraction of a second, thereby taking up all the slack and
therefore virtually eliminating the response delay due to backlash. Losmandy
and later-model AP mounts have TVC.

Wil M.
--
"When I consider your heavens, the work of your fingers,
the moon and the stars which You have set in place,
what is Man that you are mindful of him,
or the son of Man that you care for him?"  -- Psalm 8



Bobby Middleton wrote:

>
> > features like PEC and TVC corrections. Not only is the equatorial easier
> > to polar align, but it also easier to balance IMO.
> >
> > Michael "The Edge" Thenhaus
> >
>
> Michael, please clue me in on what a TVC correction is.
> Bobby Middleton