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Carlton
My image scale and FOV on my 6” f6 and 8”f5 are great for most objects but I did experiment with my Powermates ( my 2 x and 2.5x ) a year or so ago and even though you increase the size of the image in the frame you certainly sacrifice a great deal of resolution. So I came to the conclusion that they are primarily designed for planetary imaging which is what I use them for now. My 5 x Powermate is perfect for both my newts in particular Saturn and Jupiter whereas I use the full set when imaging the moon ( both wide field and lunar terrain images )
Can you upgrade your 130mm newt to a 6” f6 newt ( focal length 900mm ) Mine can image galaxies like M83 , Sombrero , Centaurus A etc... without a problem using my Canon 600D APS-C crop sensor and the object size in the frame is adequate ( you’ve see some of my posted images of these objects ) Not quite sure what your sensor size is on the 70 D ?
Cheers
Martin
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