I'm not sure if this is the right forum, but here goes. I'm playing with the design of a Newt for imaging only (no visual/eyepieces). I'm using Newt on the web for ray tracing. I'm trying to figure out back-focus requirements, and I will be using a Paracorr. I have a few questions regarding this drawing: http://www.televue.c...id=61&Tab=_phot
- Am I reading this correctly that a Paracorr will move the focal plane 56mm away from where the focal plane would have been without a Paracorr?
- Assuming the answer is yes, should I still use the ray trace without the additional 56mm when looking at vignetting? It seems like the light paths will be the same with or without the Paracorr until the light actually hits the lenses in the Paracorr.
- Does the Paracorr cause a change in the size of the 100% illuminated field at the sensor?
- Anything else that I should consider?