Qestion:

Would you have  a coma correcter for  a celestron  c 11  schmidt cassegrain telestron

From martin williams

Answer:

Martin,

There is no such lens available.  There is a focal reducer/field flattener lens available that reduces the speed to f/6.3 and flattens the inherently curved field.  But there is no coma corrector for SCT scopes on the market, to my knowledge.

However, if you are shooting at f/10, full-field, the primary distortion at field edge is not coma but
field curvature, and the FR/FF solves that.

You can see it on our website at 702-40095

Don