Hi, let me first briefly introduce myself: I'm Michael, 27 years old and currently 10 years active in astrophotography.
My main setup consists of an HEQ5 pro, a SW 8" f/5 newtonian, an ES PN208 f/3.9, a Canon 1100D modified and I recently switched to mono CCD imaging with a secondhand SX Trius-35. For coma correction I use a GPU comacorrector.
I'm currently aiming for the best possible field illumination for my Explore Scientific PN208 f/3.9 imaging newtonian. The scope is 5 years old now and while doing maintenance I wanted to do something about the design flaws as well.
With the current secondary holder design it's impossible to center the mirror beneath the focuser.
My question is: is this really an issue when the entire primary is visible? I read about optimal field illumination when the secondary is centered, but this isn't achievable with this telescope.
I attached an image showing the (very bad aligned and already degrading) secondary at the moment. This is as far down as I can go, I would need to replace the holder screws with longer threads to go further but I don't know if this would actually improve things?
Thanks in advance,