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Tried that with no effect. There is no backlash per se. My theory is that this is more a vibration set up when starting and then stopping (via a guide correction) a large mass. The measures I've taken support this theory - adjusting the spring plungers (small effect), reducing aggressiveness and increasing guide period. I suspect now, if I'm right, that correct guide rate + aggressiveness settings will solve the problem. However, I won't do any more testing until I've got my collimation sorted out.[/QUOTE]
Was adjusting the spring plungers hard or easy? I should look at that. Is it in the manual or is there a paper about it?
Yeah that was only on my PMX not PME. I am running similar or more mass and I use aggressiveness at 6 and with good seeing and no reducer but with MMOAG 6 second guide exposures with PEC. Min move .1 max move 2. I get round stars routinely. With guide scope and reducer I have to be a little careful of flexure but as long as guide scope is locked down hard I get round stars 10minutes, occassionally a small amount of elongation in 10 minute subs. Enough for me to consider an OAG/FW thin combo from Starlight Express at some point.
With Protrack I got an additional slight gain.
Greg.
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