Eye of the eclipse...

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I guess this is an old thread, but I do have some experience with double polarizers. I first came across the idea while attempting to attenuate the IR signal getting to my Cybershot F717's sensor, so that I could take infrared pictures in broad daylight. For that, they do an excellent job. I have 4 polarizers here, 2 circular and 2 linear, which I have ...


No. A filter can only block certain wavelengths, and can't do anything about wavelengths that are blocked/ignored by the camera. All you can do with a filter is to narrow the range of wavelengths captured.


SEWING MACHINE OIL (get at fabric store like JoAnne Fabrics) I have 3 B+W CPL filters (purchased from B&H so pretty sure not fakes) and after a few years all became stiff. I sent one back to B+W and they replaced it for free but then a couple of years later it too was stiff. What I finally did was to use a drop (no more) of sewing machine oil on the ...


About the notations used for filters: Notations based on tradition of 19th century scientist. T = Transmission (always as a percent) O = Opacity (always as decimal fraction) D = Density (always as logarithmic value) T as percentage O as decimal fraction (avoids confusion). D as log base 10 (because scientists of that era had no computers or ...


This is because the filters you are looking at on that page are color filters in addition to neutral density filters. The ND portion is as described at How to read ND filter description? and as you expect: 0.3 has (around) 50% transmission, 0.6 25%, and 0.9 12.5%. From further down that table: #209: .3 Neutral Density — Reduces light 1 stop (Transmission = ...


If you look at filter #209 you'll see "Reduces light 1 stop (Transmission = 51%)". That is what you expect to see. Filter #210 reduces light 2 stops and has transmission of 24%. Again, what you expect. So what is the matter with filters 207 and 208? They are COLOR filters not neutral. They a) reduce light, and b) reduce it differently in different ...


I made the Very High Radius Unsharp Mask plugin to extend the clarity filter as the latter tends to not work well with very large images. —Russell


I just made a retinex filter for Photoshop and similar: www.russellcottrell.com/photo/Retinex.asp It is a little different from the Gimp/ImageJ plugins. I tried to make it easier to understand, and included offset as well as gain. The “Level” control seems to be aimed at extracting detail from CT scans and so forth, not general photography, so I ...


My experiment with crossed polarizers (2 cpl, one reversed) has convinced me that they are not the solution I was looking for. Crossed as dark as I could get them worked about to about 16 stops -- so I was shooting 5 minutes at F22 at ISO 200 in daylight. The vertical and horizontal banding was worse than I expected, and the purple color cast was unfixable ...


It's the app camera+, open the photo, 1st step is to hit clarity, then 2nd step is to go to filters and hit HDR

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