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Old 03-07-2006, 12:03 AM
Dennis
Dazzled by the Cosmos.

Dennis is offline
 
Join Date: May 2005
Location: Brisbane
Posts: 11,820
In the good old days of 35mm film photography, I started using an off axis guider for manual guiding and they do require some getting used to, compared to the relative ease of finding a guide star in a separate guide scope.

As Alex rightly points out, locating a suitable guide star can be more difficult, as with the off axis guider, you generally do not have the luxury of the wide field of view, and independent pointing (within reason) of a separate guide scope.

So, you are limited to finding a guide star within the physical geometry of the off axis guider movements, and I understand this varies significantly from model to model. Some allow a 360 degree of freedom to rotate the guide star viewing port, others limit it to less than 180 degrees.

Cheers

Dennis
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