Meade LX200 - How to use with a DSI?
The SC is generous with back focus. This is because the focal length and focal ratio are variable. Just undo the mirror lock (if it has one) and turn the main focus nob to get in the ballpark and fine focus with the autofocus after locking the mirror again. The DSI is not a Planet camera so I assume you are going after deep sky objects. If so you may want to add a focal reducer to increase your field of view and shorten exposure time. DT ____________________________________________________________________________________ The fish are biting. Get more visitors on your site using Yahoo! Search Marketing. http://searchmarketing.yahoo.com/arp/sponsoredsearch_v2.php
Good point. If the secondary mirror is 3X, then moving the primary 1mm will move the focus 3mm. If the secondary is 4X, moving the primary 1mm will move the focus 4mm, and so-on. Quite a bit of leverage available. Generally, when SCT's are used for imaging, a German equatorial mount is preferred. The reason for a short-coupled camera is usually lack of swing-through room on a fork mount. On 5/16/07, daniel turner <outwest112@yahoo.com> wrote:
The SC is generous with back focus. This is because the focal length and focal ratio are variable.
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Chuck Hards -
daniel turner