If the moisture content of the fog is high, which it probably will be, the filter will not matter. Water [and Carbon Dioxide] attenuate infrared light in many wavelengths. It will be interesting to see what you get. Would you post pairs of photographs, one with visible light and one with the infrared when you do this experiment?
The scattering is primarily Mie scattering.
Anyway, an example of "haze clearing" (and Wood)...
Since you are in Europe, the German B+W filters might be easier to come by. The opaque 093 is best, but you can get some acceptable results with the 092 deep red. I agree with the comments about using a tripod; 093 and tripod will provide the sharpest images.
Good morning everybody.
Thanks Mike, you were right and as a matter of fact I ended up buying B+W 093 and 092. One at a decent price, the other at an outrageously high price.
I did some experiments towards the end of summer with Efke IR (outrageusly highly priced too), but the guessed ASO ratings I've seen here and there on the net are ridiculously high if you ask me. I guess it's more in the 50 ASA (with no filters) range after experimenting with it. It's simply pathetic how the film doesn't come with any exposure and development data.
The fact that the filters don't come with an exposure guide is pathetic in its turn either. Overall this has been an extremely frustrating and expensive experience. And please note that I consider myself a very experienced photographer, with a top scientific background due to my education. I'm still much oriented to experiment more, but I wonder how many people are so hardcore fans to photography as I am; the whole matter is ridicolously frustrating BECAUSE producers want it to be so, and frankly speaking if these products would totally disappear from the market due to poor sales it would be VERY WELL DESERVED.
I have now to wait until next spring and my next postal order, as these films are no longer available anywhere in shops in my area (go figure). I will post the results if I get anything decent, but quite obviously it will be no earlier than 6 months or so.
Thanks for reading, have a nice day!
I know a chap who does excellent portraits. The chap is a camera. (Tristan Tzara, 1922)
When I first attempted Efke ir820, I did it with roll film, set up a scene, then bracketed aggressively all the way down to ISO 1. (I was using the Lee IR filter.) Just needed one roll. That gave me good data points so I could reliably shoot sheet film.
There is no need to adust your focusing if using a #25 filter as there is still a lot of visible light reaching the film. My understanding is that the IR focus marks on your lens are usually calibrated for 800nm, which you won't be recording much of. The focus shift is really only required for a particular film and filter combination which would be recording light close to 800nm.