The author posted a question in Photography, Videography
Lowering ISO on the film? and got a better answer
Response from
Of course, the camera cannot change the physical properties of the film. However, the ISO value indicated on the box is a conditional value that is tied to the recommended development mode. By changing the development mode, you can both decrease and increase the sensitivity of the film within certain limits with minor changes in other properties, sometimes even for the better. Study what Push and Pull processes are and how the necessary corrections to the developer modes are calculated, these dependencies are tied to specific developer compositions and film emulsion grades. All this works fine for classic black and white silver emulsion films and becomes a completely unreasonable hassle for color films?
Naturally, the camera cannot change the physical properties of the film. However, the ISO value indicated on the box is a conditional value tied to the recommended development mode. By changing development modes it is possible to both decrease and increase film sensitivity within certain limits with minor changes in other properties - sometimes even for the better. Study what Push and Pull processes are and how the necessary corrections to the developer modes are calculated, depending on the specific developer compositions and film emulsion grades. All this works fine for classic black and white silver emulsion films and becomes a totally unreasonable hassle for color films.
No way. Get a film with a different sensitivity.
You can put on a neutral light filter - and that's the only way the film itself will have its standard sensitivity which cannot be changed.
If you shoot with a camera filled with ISO 800 film as if it was ISO50, you'll get too much highlighting. The only way out is to use a ND filter. Well and there were special developers which increased lowering ISO, but it's exotic.
.on the stake is a sponge let's start from the beginning: I have a camera model and a film model I want for some reason.
You can't lower the sensitivity of ISO film. It is constant. You can partially suppress excessive ISO by shorter shutter speeds and closing the aperture.
what prevents you from setting the film sensitivity on the camera? otherwise the options are a filter on the lens as written and dancing with developer, at least with the same mp1 in b/w, reducing the concentration and development time. the result will not be good but for overexposed film it's a way out. select the developer with different stepped developer times. with experience it's no problem
No way. It's fine for shooting in the dark, candlelight. etc. and you can get pictures of normal density. Using aperture and shutter speed to reduce the amount of light is fraught with the risk of increasing the graininess to unpleasant. The development time is indicated on the package. If you are not a professional photographer, I do not recommend your experiments with reducing developer time and weakening developer concentration at home, but I don't forbid them either. It's a waste of time and money, but it's not worth experimenting with single film; it's different with 5-10 units. You could, as Vladimir recommended above, use a neutral light filter, but this won't solve the ISO problem completely either; once again, you need to view the results on a single film, <develop it, print the photos, evaluate, choose the best aperture/shutter speed, lighting> to use in the future. you need a whole lot of film, time and money. It's easier to buy film with the right ISO for a particular shoot.