On Nov 20, 2010, at 3:28 PM, Theodore Beilby wrote: >> Pointing directly at the moon it wouldn't have made a difference, but do >> polarizers have the same effect at night on darkening the blue >of the sky? >> Can >> they be used to bring out the stars better? > > > Larry, light is light, right. The main difference is the amount that is > there.
Except that the light that comes from the moon is reflected. Reflection is one thing that causes polarization of light, but that' is usually off of flat, non conductive surfaces. Conductive surfaces (metal) don't reflect polarized light. The effect of the atmosphere on the light, I would guess, would be the same whether it's from the sun, or the moon. I also expect that the color balance in both the visible and the invisible spectra would be different between moonlight and sunlight. > It still has the same properties so I would think it would have some effect > though it might be hard to tell while you are looking through the viewfinder. > You would also loose approximate 2 stops, so would give you longer shutter > speed. That is another factor. > This is just speculation on my part, I have not tried using a polarizer > at night. > > Try it and see what happens. I plan to sometime. It would have required thinking of it when I was grabbing my cameras out of my car. I think that my biggest lapse in forethought was in not bringing a microfiber cloth to wipe the dew from the front of the lens. That may have contributed to the softness that Ann saw. > > Later > > Ted > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. -- Larry Colen [email protected] sent from i4est -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
