[Dbroz (Daniel)]

Hi everyone

I have built a 18” truss dob. The primary mirror is 457mm diameter, focal length is 2308mm, from primary to secondary is 1998mm and secondary to eyepiece is 310mm. My question is I was told a 80mm secondary will suit this scope best, but as I have accidentally damaged the new 80mm secondary I had to buy a new one but I couldn’t find any in stock in this size. So I ended up buying a 88mm mirror instead. It should arrive to me in about a weeks time, my concern is that this mirror might now be too big. I’ve been trying to research this but I keep coming up with mixed answers. I’m just seeing if anyone could tell me if I made a mistake buying the 88mm instead of waiting for the 80mm to be back in stock. I couldn’t wait too long as I need my scope for the snake valley star party and I didn’t know how long it would be until a 80mm will be back in the market. I would love to hear your thoughts.

Thank you
Daniel