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I own all four of the focusers you have listed. My preferred order is;
1. Moonlite - tough as nails, solid as a brick, smooth as a babies bottom, excellent for AP. You will not go wrong with a moonlite, I own 2 and they are a great focuser (I prefer them to the FT but I have a ton of weight hanging of the back). Just make sure you get the drawtube with the 2" compression ring (3 thumbscrews) as the single thumbscrew version is hard on your diagonals and camera nose pieces. They are super smooth as and pretty to look at as well.
2. feather touch - okay I guess but not worth the extra money over the moonlite. For visual work they are excellent being very smooth in operation but for AP I have found they do not cope with heavy loads as well as the moonlite - note IMO dont want to start a war here.
3. Williams Optics - Nice and smooth but does not cope with heavy loads too well. Are well priced but the draw tube is too short for the refractor they fitted it to.
4.(massive gap)
5.(massive gap)
6.(massive gap)- 3 lucky bands and a paper clip.
7.(massive gap)
8.(massive gap)
9.(massive gap) - by now we are down to a bucket full of pond water and stick.......
10. JMI- worst focuser I have ever owned and has a manual action akin to being dragged through gravel in your undies. It is a motorised EV1 with smart focus and cost a heap to buy. It never could reposition itself after focus changes, continually slipped and autofocus routines were a joke. The motor was way to weak for the job it had and in all was an absolute waste of my hard earned money. It is so bad that I will not sell it on as I fear my good character would take a bashing from the poor buyer so it sits on the shelf gathering dust.
Mark
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