Quote:
Originally Posted by Merlin66
Knez,
No problem with an OAG in front of the reducer....we used it that position many years ago for film astrophotography...in fact the Lumicon Giant Easy Guider was constructed that way...
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There are at least 2 reasons why you should avoid placing OAG in front of a FF/FR.
1. It will degrade image quality because it will block some of the light which is not the case if positioned (correctly) behind FF/FR.
2. Guiding camera will be very far from prism which will make finding suitable star very difficult.