There is another source of ghost images from a side window refraction
I went out to my Berk 34QS today to install what I thought was the solution to my reflection problem. I attach a picture of the black towel behind the driver's seat. It covers the slide window behind the driver.
I didn't have the conditions to test whether it solved my problem. The problem occurs with bright light facing the front windshield and a dark space to the left of the coach into which I am backing. I didn't have the dark space.
However, I did mention that I also had noticed ghost images in my left mirror as I drive, and I assumed that they were related to the problems with the left mirror being overpowered by a reflection. Maybe they are related and maybe they aren't.
But, the big (bad?) news is that the towel doesn't get rid of the ghost images! Now we have a mystery and I looked more carefully. Obviously the ghost images aren't a reflection from the slide window and I couldn't find any other surface that would provide the reflection. I am able to identify the source of the ghost image because I can see the logo and windows on the trailer across from me.
I finally discovered that if I position a flat object like a book so that one edge is along the pillar between the windshield and left side driver window, and so that it goes back toward the driver in a manner that it doesn't block the driver's view, then the ghost image is blocked.
I'm a photographer and the necessary light path is perplexing. It has to be the case that the light enters the windshield and hits the driver's side window just behind the pillar, because my book was only blocking that light path. But, there is no way for the light to be reflected forward to the mirror. It must be refracted! That would require an incredibly high index of refraction. But, the side window might be laminated safety glass, which gives another surface for a second refraction. At any rate, the two refractions seem to turn the light by almost 90 degrees so that they hit the side mirror and reflect back to the driver.
OK, so this explanation is a bit complex, but there are three conclusions to draw from this:
1. The ghost problem can occur on a coach even if it doesn't have a forward-facing window on the slide behind the driver.
2. The ghost problem may or may not be the same as the problem that causes the side mirror to be virtually useless when backing into a dark spot. If it is not the same, my black towel solution may be all that is needed to solve the parking problem.
3. If the ghost problem is the same as the problem that makes it hard to back up, the solution is to fasten a flat vertical piece (black coroplast would be safe) with its edge along the pillar between the front windshield and the side window and aimed back at the driver in a way that does not block the driver's view. My guess is that something 6" wide by one or two feet tall would do the job.
I'll report back as to whether the towel solves the problem after my next trip.
Gordon Sick, Calgary
2015 Berkshire 34QS
2005 Acura EL (aka Honda Civic)