Hi Tom,
Based on the number of Ovision worm returns and the often very mixed reviews in testing by people who spent a lot of money for often no better results or worse results than a carefully tuned Losmandy 2-piece worm block setup I think the Ovision worm is an very pricey significantly less reliable option.?
The new Losmandy OPW design offers similar performance to an Ovision worm that tests good but the Losmandy OPWs seem to have more consistent real world test results. Additionally with the the addition of improved worm mesh adjustability with the threaded adjuster and the ability to buy a PAIR of new Losmandy OPWs with a brand new HP worms installed for less than the cost of a single Ovision I think the new design Losmandy OPW is the better way to go. Most imagers are using an autoguider and the results using an autoguider do not seem to get much better than 0.3-0.4 arcseconds RMS which is typically much better than the seeing will allow under ideal conditions.?
If this doesn't clearly answer the OP's questions I'm not sure what the OP is asking.?
Chip?
?? ??
