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This is really helpful thankyou!
I also didnt know that by using reducers you effectively reduce the image circle as well. That would catch a lot of people out im sure.
I have pulled the trigger on the RASA 8, and so with my XT2 sensor (width 23.6mm) i think that wont be too bad at all.
And i def take your point on the central obstruction reducing the actual f/number.. in my case it will be reduced slightly more id say given the camera body will be larger than that again. Oh well.. ive dived in, and to be honest relieved for the moment that a decision has been made, lol.
I will def see how this goes and perhaps return to the alluring world of refractors at a later stage in this hobby.
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