To add to my post below...
'Reflecting telescopes do not suffer from chromatic aberration.' Source: University of California, San Diego
Center for Astrophysics & Space Sciences
http://casswww.ucsd.edu/archive/publ...l/Reflect.html
The corrector plate on an SCT, Mak, etc... corrects for spherical aberration only.. caused through mirror design.. Source: telescopeѲptics.net
https://www.telescope-optics.net/SCT.htm
If the corrector plate eliminated/corrected for IR then it would be useless for spectroscopy.. it's not... it would not allow me to use an IR pass filter for planetary IR imaging... it does...
Sorry but, IR spectrum bleed is a completely different beast.. it is a factor for imaging using refractors for CA leading to star bloat & it can be a factor for star bloat using other telescope designs; it is also a factor in colour washout.. hence why a filter is used on those camera's which do not have a native UV/IR cut filter. The difference between an Astro modded camera & a full spectrum mod is in fact, whether the IR cut filter is left in place...
Star bloat in an SCT (in fact in any imaging scope) can be caused by many, many other factors.. field curvature, focal length, tracking inaccuracies.. the list goes on. Is an IR filter going to fix all of these... NOPE.. but, it will eliminate factors caused by spectrum bleed... it will help but, it won't fix everything...
This is why people who are really, really, really good at this use all sorts of additional gear to achieve spectacular images... field flatteners, guiding, plate solving... to name but, a few...
Cheers