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I have looked through several large Dobs including I think it was a 24inch at Cowra.
These are great but huge and unwieldy.
I have had several high end APOs. The most memorable visual APO was a Tak FS152. I got that scope at the time as the TOA150 was not yet out otherwise I would have gotten the TOA150.
A TOA150 would be outstanding and particularly for imaging as Marcus Davies images show how good they are. But I have read many times they are heavy and front heavy so they don't balance easily.
My TEC180 was good visually as well. Orion started to look a bit greenish but I mainly used it for imaging.
I had a Nexstar C11 that was great. The Goto's and easy setup of the SCTs is very appealing.
You'll see more in a large Dob but the offset is the size and setup. Not sure about how well the gotos are as I have never had a dob.
A 6 inch APO is a very versatile scope. APM and Teleskop services are selling 152mm "APO"s these days quite cheaply. They are probably great for visual being a doublet and rapid cooldown. For imaging it would have to prove itself as the usual requirement is a triplet.
Greg.
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