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Just another little update.
I managed to get round stars last night from the PMX so it is capable of handling the RHA with care. The scope was slightly off balance and I rebalanced it plus I did a new PEC curve, tightened all the adapters and fittings and did a new 100point t-point model which basically said its good enough. The T-point model errors were quite low. I did one before the rebalance and tighten and got terrible t-point model errors.
So now the only tweak needed now seems to be getting the camera perfectly square which I did this morning. If there is even slight tilt it shows up in the corners quickly as elongated stars. Usually only one or two corners not all 4 or one side is sharp and the other a bit out of focus.
F3.8 is a hard taskmaster but worth it for the speed. But for sure once I've got it all perfect its gonna be a case of don't touch anything!
Its an interesting journey as there are now quite a few scopes that are F4 or faster on the market and the faster they are the fussier they will be to tune. So the speed comes with a demand for accuracy in all things around it. No free lunch here. Luckily this scope does not need collimation as that would be a challenge.
Greg.
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