writes:
>Ric L Ecker wrote:
>> The problem you are having is the calibration is moving the star
>off
>> the prism. An easy trick is to use a eyepiece diagonal and
>calibrate the
>> 201 through the main tube. Basically you only need to calibrate
>once in
>> this configuration for most of your guiding unless your are taking
>> pictures around or near polaris. The 201 will now be setup for your
>OAG.
>
>Ric, right now my 201 is callibrated through the main tube w/a star
>diagonal (without the OAG attached). It works great when I use it like
>this (for piggyback shots). However when I use the 201 through the off
>axis prism, it doesn't seem to work. Maybe the fact that I have to use
>a
>star diagonal in the off axis port to reach focus with the 201 has
>something to do with it. In this configuration, my right acsension
>star
>movements are the same as the main tube, but my dec star movements are
>reversed (i.e. when I maually guide with my 9mm illum reticle, I
>reverse
>the North South keys on my controller so I don't accidentally make a
>wrong correction). This is why I have to recallibrate when I use the
>201
>off axis. Would a straight tube extension, in place of a star diagonal
>fix things so my North and South corrections are back to normal?
>
>Thanks,
>Rick Keil
>"7/5th of all people do not understand fractions." - unknown
>
Once you have calibrated the 201 using the diagonal, its set until you
change the configuration i.e. straight through the OTA. The OAG is a
diagonal and the pictor will guide using the pick-off prism. You don't
need to re-calibrate unless you change the config.

****************************************************
ric ecker
san marcos, ca.
curator of the Willard Observatory
http://members.aol.com/rlecker/optas.html...........Pictor 216 XT images

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