It's REMARKABLE HOW certain designs persist despite having obvious shortcomings. Take the collimation adjustments found on 99.99% of all reflectors, both commercially made and home built. Rare is the scope that doesn't use three evenly spaced adjustment screws both for collimating the primary mirror and setting the tilt of the secondary. And yet, the motions produced by this arrangement are unintuitive and difficult to remember. Wouldn't it be much better to have two adjustments that produce perpendicular motions, one that moves the collimation target up and down and another that shifts it left and right? I have made a few scopes with this X-Y-axis- adjustment scheme and find it makes collimation much, much easier. Australian Doug Parkes is another ATM who shares this preference.
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