PERCHE LA MACCHINA FOTOGRAFICA O IL DIVING MASCHERA LA COPERTURA CON UMIDO?

Why does my sub-water camera grow mouldy? Why does my diving mask steam up? If your cameras always lie in the climate regulated room and then the camera case or even the camera mounts steam up in the morning, why do they see in these tables.

You sees in this table the relation between air temperature in degree centigrade and the relative atmospheric humidity in per cent. The dewpoint announces at which temperature and how much percent relative atmospheric humidity it comes to the condensed water formation. In the left column you see the air temperature in °C and in the upper line see the relative atmospheric humidity in %. Go from the desired temperature horizontally to the right and of the respective humidity vertically to below. The temperature of the dewpoint is in that cell where the two values cut themselves. The example was stressed in color with 20 degrees Celsius and 60% atmospheric humidity (dewpoint 12.0 degrees Celsius) as well as with 30 degrees Celsius and 75% atmospheric humidity (dewpoint 25.1 degrees Celsius) in the table.
How the camera or the glass of the diver's mask has the same temperature or is cooler as the found dewpoint, it comes to the condensed water formation at the cooler object, this means the camera or the mask steam up. Only, when the temperature of the object gets warmer, as the found dewpoint the lens or the camera dries again. If the camera or the lens has the same temperature, like the surrounding air (or the included), a condensed water formation isn't possible and the glass plate doesn't get covered with damp.

The next table shows how much gram of water per cubic metre can be taken depending on air temperature at most. Some divers put her camera brieefly in the sun, because if the camera and the subwater case have approximately the same temperature like the sea, the glass plates cannot steam up. Depending on size of the camera and attitude of your air conditioner warming can last without sun up to an hour. Of course the today's little digital cameras warm themselves considerably faster. If you still gives the camera into the subwater case in the room, then the air gap works in the case as an isolating container. The camera remains cold for a long time and also cools the air in the case down so that the glass plate of the case can steam up.
An example: The camera is colder than 24.1 degrees Celsius, but the water is 29 degrees Celsius warm it would form condensed water. Since the condensed water always forms on the colder side of an object, this would be at the outside of the subwater case and of course you sees nothing of this in the water. If the water is, however, 29 degrees warm and the camera is only 24.2 degrees Celsius warm or cooler then the condensed water steam up at the inside of the case. Since synthetic material is a bad heat conductor, of course only the glassy windscreen of the subwater case always steam up, in the extreme case though also the glassy camera objective. If condensed water forms at electronics, you doesn't see this but the electronics can be damaged by it irreparably. Digital cameras mostly die, however, by hair or sand on the O ring.

As you sees in the table, sometimes the atmospheric humidity plays a role, too. If you puts a cold camera in the subwater case in the warm air outside the bungalow, then the air cools down in the case by the cold camera and the repletion behaviour of the air changes in the case. 30 degrees Celsius warm air binds up to 30.4 grams of water per cubic metre. If the air is cooled down in the case on e.g. 25 degrees Celsius, then this air only binds approximately 23 grams of water. If the atmospheric humidity had been 100%, then these 7.4 grams would have been cancelled as condensed water in the case. Since the air is, however, hardly ever 100% damp and being today's cases built so that they have no-one or hardly any impetus, this is through much more smally the air gap between subwater case and camera than still a couple of years at the older cameras ago. Since the air is hardly ever made replete to 100% in the Maldives, low temperature differences of 1-2 degrees Celsius don't have an effect negatively.
Many subwater cases have a small cut-out for little bags with Silica-Gel which take and store the atmospheric humidity inside, so that the dewpoint moves itself by the lower atmospheric humidity to below and it doesn't come to any condensed water formation on the glasses. Calling at the case windscreen also can by spray be prevented with an anti steam-up spray. This spray can be used also against covering the diving mask glasses with damp. What doesn't always help but nothing costs: The diving masks' plates put cream with tooth paste and then wash up. As old household remedy (works not always but often) helps: Spit in the the diving mask glasses and then rubbing and washing up.

Ultimo un'altra piccola punta:

Anche se questa punta deve non fare niente coi Maldive né con tuffandosi o nuotando col respiratore, ma ciononostante qualche cosa col dewpoint e la formazione di acqua concentrata secondo la tavola superiore. Se Lei inclina una finestra per 24 ore, non sia nessuna più aria scambiata in questa stanza come se Lei apre completamente la stessa finestra per 10 minuti (cosiddetta ventilazione di spinta), ma solamente il muro circa la finestra si raffredda forte a punta lunga e l'umidità della calda aria di stanza condensa al muro freddo e viene alla formazione di muffa. Perciò mai le finestre di inclinazione spalancano per molto tempo ma sempre 90 gradi per un po' di tempo!