MDA3V dist. amp impedance mismatch

[tkamiya]

I am using Extron MDA 3V distribution amplifier (1 input, 3 output, all 75 ohm) for 10MHz distribution.  Cables are all RG58 of some kind.  I think 75ohm/50ohm mismatch is not a big deal as VSWR is only 1.5, AND equipment 10MHz input is not always 50 ohms.  Am I correct in my assumption? 

I did locate the output/input resister in MDA 3V but I'm kind of lazy to change them.