Recently i acquired a new baader mark V bino to use with my CFF 140 after reading many great reviews here, especially the ones concerning the 2x pan 24mm combo for wide field. I also got the baader 1.25x GPC thinking that would be enough to reach focus. Unfortunately i was wrong. I am using a TV everbrite diagonal which eats up a lot of light path. I then switched to a TV powermate 2.5x and finally reached focus. So my final setup is TV everbrite 2” diagonal, TV powermate 2.5x , mark V bino and 2x pan 24mm.
Then when i finally turned to the double cluster to test this combination i saw a huge amount of distortion starting from about 2/3 from the center and worsening towards the edges. The stars in the center were fine and sharp. What i mean by distortion is something resembling field curvature. The stars were elongated. When i tried viewing with the baader zooms there was less distortion but that was probably because of a narrower field of view. I am baffled.