I bought it in the mid 90s but, as you can see from the picture, the OTA isn't 1000mm long. I suspect there may be a barlow at the bottom of the focuser tube. Does that mean I have an f/4.4 mirror and lots of coma? Can barlows add chromatic aberration?
For those having trouble with the picture: dia 114mm, fl 1000mm, f/8.8, 460mm optical tube, newtonian reflector.