FLI AD-1 Adapter - DF-2 or CFW to 2" SCT Thread

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FLI AD-1 Adapter - DF-2 or CFW to 2" SCT Thread

FLI AD-1 2" SC Thread Adapter for DF-2 or CFW

The FLI AD-1 Adapter fits the DF-2 or CFW on one side and a 2" SCT Thread on the other.

Download a drawing of the AD-1 Adapter for measurements.

Finger Lakes Instruments Product Number: AD-1


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Jeffrey S.
United States
Too large for DF-2

I installed this on my DF2 focuser, and it was very snug. When I got it on far enough to realize it would not go on all the way, it would not come off again even with a mallet! My only option was to hammer it straight, so it could be used. While I managed to get it straight enough to not notice on my 12" f/10 sct with no focal reducer, it is not all the way in. I'm relying on the set screws which are only able to be partly in due to the adapter not being fully seated to prevent my camera from falling off! At this point, if I wanted to remove it, it would probably destroy the focuser. In addition, the male threads are too short to screw my focal reducer in, and I will have to try to find a short sct extension in which the female threads are all the way to the end in order to fit the flip mirror I use on it.