|
Hi Chris,
No problem doing that.
Just remember that the errors on the optical surfaces compound. Hopefully your first surface mirrors are good quality. The photo below is of my friend Glenn Schneider, veteran of 35 total solar eclipses. The white box contains a Nikon 5" f12 ED objective. Glenn only used a single flat mirror inside the box so the camera is "pointing the wrong way." From memory, the flat was 3.5"-4" and he ordered a high precision flat from the now closed D&G Optical.
The box was pointed at another high precision 6" flat mounted on a helio stat that kept the suns' image directed down the optic axis. Using two flats, you probably want 1/20 wave flats. But if you have two already, try them and see?
They each need to be a bit bigger than the diameter of the optical cone to avoid vignetting.
Interesting project.
Good luck.
Joe
|