Barrow lens study for Mars 2020 under Mkv-4inch

 There are x2 (Vixen,3rd party) and x2.5 (Power mate) barrow lens with me.Good combination study was performed taking 3 lens combination . Telescope was 4inch makstov (celestron) on Oct12 2020.CM=about 40° center seen Malines Valley. Seeing was 3-4.lens power x2 ,x2.5 ,x4 , x6+

Diameter=22.40",Magnitude=-2.62,CM=37.7°  (during mid of capture),FocalLength=4950mm,Resolution=0.12"

Judgement was x4 better for Mkv4inch Camera Asi290Mc UVIR cut filter

x4 is made by  x2 Vixen and x2 Svbony 

Here all kinds of combination.