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Good question Lewis.
I have imaged with both. My PME has the extension and I get round stars.
I was using my PMX without an extension and got round stars with an AP140 which weighs about 20kg. Then with the Honders which weighs over 30kg and using an extension bar I was not always getting round stars initially. I moved the mounting plates so all anchors were engaging and put a dovetail on top of the mounting rings as well and I got round stars.
But the risk of an extension would be flex in the shaft. So with that in mind I suspect no extension and more weight would be better. It depends on how much overall weight your mount is able to take.
Greg.
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