Polarising filter Solution for DashCam

benjy said:
Thank you,the attachment is quite mind blowing I didn't realise the science behind it all so thanks for bringing that to my attention.

You are right there is an obvious reason behind having a rotating lens I just didn't think it would make that much difference as when I was gluing it to the frame I made I rotated it to make sure I had it the right way round but a 360 degree turn made little difference and it certainly didn't completely go black so I fitted it with the thread part toward the camera as suggested so I think I have that right, I will just have to turn it bit by bit as there is no screen on the Mobius to focus so to speak until I get it right.

Thanks again for your help !
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Most polarising filters including Hoya filters have a white line which if you place it exactly at the top or bottom makes the polarizing exactly vertical which is what you want - you don't need to set it by trial and many errors...
 
And if it doesn't have a white line, just connect the Mobius as a webcam, it'll take no time at all to work out which lens position is correct.
 
Thank you again for the information about the white arrow which I have set to the top but I am still at a loss to know how the rotating ring bit works as there is still a great deal of reflection present far more than I would have expected given the work and expense involved in attempting to get rid of it.There is no markings on the rotating ring.

Thanks again !
 
benjy said:
Thank you again for the information about the white arrow which I have set to the top but I am still at a loss to know how the rotating ring bit works as there is still a great deal of reflection present far more than I would have expected given the work and expense involved in attempting to get rid of it.There is no markings on the rotating ring.

Thanks again !
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The white mark should be on the bit that rotates, otherwise the mark would be useless!

Have you got it the wrong way around?

See my previous post:
Nigel said:
The easy way to tell which way around a CPL should be is to hold it up to a mirror and look at the reflection of your eye. If you can see your eye then you are looking from the camera side, if all you see is blackness then you are looking at the front. If you can see your eye through both sides then it is not circularly polarised but just a linear polariser.
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I think I have it the wrong way round.
I was putting to much emphasis on the "thread" side which I presumed would screw onto the camera in normal use,but yes the mirror test confirms I have it the wrong way round.
Would you know how I can remove it having now adhered it with "super glue" ?
Thank you again for your patience and consideration.
 
benjy said:
I think I have it the wrong way round.
I was putting to much emphasis on the "thread" side which I presumed would screw onto the camera in normal use,but yes the mirror test confirms I have it the wrong way round.
Would you know how I can remove it having now adhered it with "super glue" ?
Thank you again for your patience and consideration.
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The filter probably has a thread both sides so that you can screw another filter on the front, the front thread will be an internal one.

To remove super glue use acetone (nail polish remover) to soften the glue, but test a spot on the camera plastic first as it dissolves some plastics - eg polystyrene, a camera is probably safe though - it comes in a plastic bottle.
 
Thank you again,I have used some nail varnish remover which released the lens.I have managed to clean up the washer and have now super glued it the right way round so I should be in a position to try it out on the camera tomorrow.

Thanks again you have been really patient and understanding,I bet your are a teacher !
 
Thanks Nigel, after letting it all set for twenty four hrs I am delighted with the results it was worth persevering with.

Again Thank You
 
benjy said:
Thanks Nigel, after letting it all set for twenty four hrs I am delighted with the results it was worth persevering with.

Again Thank You
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Excellent news :)

So was the best position with the white line exactly at the top?
 
I set the arrow directly at the bottom when the camera was upright so it would have been at the top when fixed to the screen but I couldn't have wished for a better picture,crystal clear and not a reflection in sight !
Well worth revisiting the mistakes I had made and learned a great deal about the science behind polarisation.
Thanks again
 
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