Author Topic: January 2025 (Read 5720 times)

KarlMera · « **Reply #60 on:** January 06, 2025, 11:27:18 »

Mystic

Hugh_3170 · « **Reply #61 on:** January 06, 2025, 14:35:42 »

Birna, thank you very much for this information - most appreciated.

Quote from: Birna Rørslett on January 05, 2025, 15:14:55

As stated in the text, it is a heat exchanger (and thus, not a filtration device). The principle is simple, you breathe in through a fine wire mesh, and exhale through the same thus heating it. Next breath is thus pre-heated. Works very well down to -25C or even lower if the standard mesh is replaced by a more massive type of grid.

The disadvantage is of course one looks a bit weird, but as a photographer you get lots of weird glances already. The mask I'm using now is small so doesn't impose too much on normal activities. The main drawback, inherent with all kind of heat-exchangers in very cold weather, is condensation that can turn to ice when it seeps off. A small price to pay as I survive the cold !!

The name of my mask is 'Airtrim Asthma Breathing Mask'. It is quite cheap too.

KarlMera · « **Reply #62 on:** January 06, 2025, 16:50:09 »

Quote from: aerobat on January 05, 2025, 13:50:48

Interesting effect

Hello Daniel, thousands of reflexions and dispersions of melting ice drops in the right backlit moment, good for a new kind of photography.

golunvolo · « **Reply #63 on:** January 06, 2025, 21:35:06 »

Columbus was looking for a McDonalds...

D5300ir 830nm, 35mm f2 ai

Birna Rørslett · « **Reply #64 on:** January 07, 2025, 09:58:26 »

A little snow is - or should - not be unexpected in winter. Yet people immediately complain the roads aren't cleared and that it is difficult to drive? Perhaps they already have forgotten the snow that fell last winter. Apparently 'brain rot' is ubiquitous in the 'smartphone' age.