Paracorr, Televue

People,

This question might be unecessary, but I have been wondering if a Paracorr could improve a SCT's edge performance. They are supposed to be corrected anyway, but could a Paracorr give a final touch?

Dean

Originally Posted by Dean De Lucia

People,

This question might be unecessary, but I have been wondering if a Paracorr could improve a SCT's edge performance. They are supposed to be corrected anyway, but could a Paracorr give a final touch?

Dean

I do not know with confidence, but I suppose that this may be effective, because it is probably designed to deal with edge of field coma correction and this is where coma is usually found. On the other hand, the corrector plate and the curved secondary mirror might be factors which the Paracorr was not designed to deal with.  If the coma correction applied by the Paracorr gets applied across the entire field, this might cause distortion of the appearance of stars.

Laurence,

True, the Paracorr is definitely not designed to deal with a convex secondary mirror. But when you think about it, most coma problems are at the edge of a concave mirror, which a Parcorr deals with. But a SCT has both.

Dean