|
Hi Greg, looks like a nice scope you have going there! I'm the owner of the Serrurier truss scope which Rod was linking to.
I would say from my personal experience that a wire spider is in every way superior, but it is of course also slightly more complicated to build and install. A curved spider will have to be made of relatively thick material, and while visually you don't notice the spikes around stars with a curved design the diffracted light is in fact just spreading out across the entire FOV, so you'll have less contrast overall. Depending on what you plan to use your scope for, that may be an issue or not... For visual observing you may not notice any difference. For imaging it can make all the difference - I have certainly noticed a much improved image resolution with my new scope, and that is with the exact same optics as I had mounted before in a traditional sonotube OTA with standard 4 vane metal band spider.
Another aspect of my particular wire spider that I enjoy is how incredibly easy it is to adjust. I can make ultra precise small adjustments of the string tensions with the guitar machine heads, all while looking through the focuser.
Regarding the strings, I'm using 9 gauge steel strings (0.23mm). They are actually not under much tension at all since it is the geometry of the spider that keeps it rigid, not high tension.
|