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Hi Narayan,
The Mak Cass is a telescope and not an astrograph.
Sorry, but I like lecturing people about the difference between the two categories.
A telescope, to be worthy of its name, needs to be corrected only for spherical aberration and colour, which is not good enough for DSO imaging.
An astrograph, on the other hand must have all Seidel aberrations corrected, and those also include coma, astigmatism and field curvature.
However, for objects that are only a few arc minutes across, you should be ok with the Mak Cass, although the stars in the corners of the frame will not be the best.
Hope that answers your question.
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