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Hi Les
I have used the Tak Extender x1.6 and Televue PowerMates on my Mewlon 180 and Celestron C9.25 for long focal length, high resolution imaging of the Sun, Moon, Planets and double stars.
Although I have not conducted a formal analysis of the results, I do recall that I was very satisfied with both the Tak and TeleVue Extender/Barlow.
Bear in mind that this genre of photography usually uses a webcam with short exposures where 100’s of frames are stacked to capture those moments of “lucky” seeing.
I cannot really comment on long exposure deep sky applications.
Cheers
Dennis
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