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Aside from the focus issues the PST EP adapter is not geared for holding a DSLR of that weight. The screw is made of plastic. I tried using my DSLR on my solar Max and found it took terrible images that were red and resolved very little and slipped due to the screw fixing. With a Solarmax 90 you need the straight through version so the blocking filter is located in the scope and not in the diag. The best advice is use a DMK41, or perhaps get a monochrome large format camera and try that. The imaging circle of the PST is quite small too with the blocking filter it employs. It will seriously vignette your DSLR images too.
For my money I would use the larger DMK, and is in fact my next camera purchase for doing whole sun portraits.
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