Quote:
Originally Posted by ptc
First off, you ought to read the paper I wrote and review the slideset because it speaks to what exactly I am doing and in reading your questions it appears to me that you may not be understanding the goals and methods very well.
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Richard - I did read your paper and I understood what you are doing. If I've gone off track anywhere it is in not understanding that the concept of circular polization existed - I thought that there was only one type and linear polarization is the only polarization conept that I know and understand.
My question was basically the question of sourcing the filter and mechanism of rotation. My reference to lunar glare was with reference to the devices which are commercially sold to allow one polarization filter of a pair to be rotated with respect to a fixed filter to reduce lunar brightness to varying amounts. I thought, therefore, that removing the fixed oriented filter may allow the modifed device to be used in the sort of imaging that you have done (as they are readily and cheaply sourced and they provide a mechanism of changing rotation). If it is the case that this is not suitable because the filters are of circular polarisation type then any info on that (from any anyone) would be welcome. I will be, of course, be doing more research myself.
Edit:
Here's an example of the device I was thinking about
http://www.rothervalleyoptics.co.uk/...ter_d2741.html
I think however using three filters in a filterwheel, as you have suggested, is probably the ideal solution.
Keep up the good work.
Mark C.