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Probably not. The mak has all spherical surfaces which makes it good as it never needs collimation. If you are seeing spikes, then it is probably atmospheric turbulence, seeing, causing them, especially low down on Venus. Try near the zenith and see if that improves the image.
I have a beautifully corrected scope and sometimes for months on end I feel like chucking the thing out because it cant come to a sharp focus due to seeing!!!!
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