Here's a simple schmatics and the simulation result. The signal generator setting is : 1M Hz, sine wave, 1V rms. The green wave is VF1, the brown wave is VF2. I think VF2 should be VF1*1K/(1K+470), so the should have same form , just have different level. but the simulate result shows that VF2 is much more different, I wonder know why.