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guyd 03-18-2013 03:02 PM

rear view cameras / screens / focal length
I have reeplaced the masive barn door like mirrors on my motorhome, with two cameras and two 15" lcd tvs.

one problem i am experiencing is the constant change in focus from infinate (looking forward) to short (looking at screen 2 feet away)

In a large vehicle (this thing is 33 feet long), especially in our UK smaller and more congested roads, it is necessary to look at the rear view every coupel of seconds - all the time - a bit less on motorways (interstates?)

I have thought about getting some sort of lens to make the screens look like they are further away (focally) without reducing their 'size'

almost like those 'fresnel' lenses you see for reversing - but a proper lens not a load of lines...

any ideas?

didnt know where to ask...

P-hack 03-18-2013 04:00 PM

I don't know about europe, but there is a science surplus store near me and they have all kinds of stuff including convex or concave lenses as appropriate, that you could cobble into a housing of some sort. If you could bring the camera and a monitor into the store you could experiment till you got the desired visual effect.

guyd 03-18-2013 04:11 PM

A friend of mine's mum had a small japanese car, where the 'dash' appeard to be about where the front (left for us limeys) headlamp was - really weird to start with.

im trying to think of some use of a big lens that would do this effect - its concave I need - right?

mozul 03-18-2013 05:28 PM

Why not just see the optometrist and get some bifocal glasses?

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