Archived posting to the Leica Users Group, 1998/06/10
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]The recent posts on polarisers have made me think a bit more about the Leica swinging hood. I use mine infrequently but had always assumed that the device swung through 180 degrees so that the view seen through the viewfinder was corrected for the film (inverted image on film) I had assumed this 180 deg swing was therefore crucial. All suggestions made on= the LUG for alternatives were ways of orientating filters on the lens at the same angle as that shown by a direct view through the viewfinder, ie 180 degrees wrong on the film. Then I thought perhaps polarisers repeat every 180 deg, given the physics of polarised light. Is this so and in th= is case why do Leica go to so much trouble to rotate the filter correctly in= their swinging device? Also, on another tack what is a circular polariser= ? If orhtogonality of polarised light is required for cancellation as I understand it what is a circular polariser doing and how does it , for example cancel a reflection? Only Curious Frank