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I believe that Fahim has already provided a links. There are many more out there too. I did a google search and you can even see plenty of links on the obsession site.
The comment where you say you would not give any prospecitve purchaser of a large dob the idea of serious deep sky photography, is quite frankly suggesting that it cannot be done. Trouble is that it is being done and has been done for a long time. Short subs and a field derotator work well. You could also do short subs and derotate the image in photoshop. There is work to be done to keep the scope controlled, but nothing is impossible. Myths abound in this hobby. Like not using a large mirror for planetary because of the thermal lag. Peltier cooling has changed all that. Using alternative ideas is how the hobby progresses and myths are broken.
So I would and will make recommendation because this stuff can be done. Sorry to offend, but I have been around for a long time and heard lots of people say things that can't be done or you are using the wrong scope for that. Positions of ignorance suggest more research needs to be done, by those making the statements.
Paul
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