Guidescope FL is 180mm and the Lodestar is 8.3um by memory.
The SXP did the same graphing with the f/5.3 FSQ85 as with the f/8 TSA (and the TSA with extender at f/12). I posted a graph a long while back with the TSA at f/12.
But seriously comparing a PME to an SXP is rather silly
