Hi Bojan,
I have a Celestron reducer one of these....
https://www.bintel.com.au/product/ce...yABEgK6h_D_BwE
You could borrow it if you like to compare with the Meade optics to see if there is any difference. I notice in the details in the link it says...
"Produces a corrected field of 24mm diameter. The back focus is 85mm, from the reducer’s back element to the cameras sensor"
Best
JA