A final result of your picture taking ventures is a spin of film, a few of prints or a box of slides. Different than your choice of lens, the film choice will have biggest impact on the quality of the results.دانلود سریال شهرزاد
When almost all of this is less relevant for digicams, “film” velocity still applies. In this case the speed impacts the noise level alternatively than grain size but the final result is somewhat similar. Choose the smallest ISO for the required shutter speed, web browser to allow hand-held taking pictures or freezing sports action.
CHOOSING A FILM
you ) First choice is slide (positive) or print out (negative) film.
better exposure latitude (some being unfaithful stops vs 5 halts for slide)
easy for prints
suitable for cheap compact cameras
Slide (also known as reversal or tranparency film)
greater shade saturation and contrast (especially professional film)
no “middle-man” adjusting colour balance or exposure
much simpler to digitize
requires good camera to obtain correct exposure
Since slide film has 5 stops of latitude, right exposure is much more critical than print film. This means conditions camera with a precision auto-exposure meter such as an SLR (or very good compact) or by using a light meter.
Black and white film is all negative nowadays. There was a wonderful black and white slide film offering from Agfa called Dia Guide. Now long discontinued. There are several techniques for creating B+W slides from negative film.
Slides are also a much better choice if you need to take film pictures and then digitise them. Negatives are notoriously challenging to colour accurate after scanning. You can look at the go and compare with the digitised version to get an accurate colour balance. Prints do not give you a valid guide point!
Summary: if you would like images go for print film. Slides if quality or scanning.
installment payments on your Next choice is film speed.
As with everything else in life, getting a film speed is a workout in compromise. Reduced film speeds (smaller ISO) have a finer materials nevertheless the greater light required means slower shutter rates of speed and may interfere with picture taking. Faster film rates allow for faster shutter release speeds but the increased grain size can be distracting.
ISO 100 or slower for the finest grain. Use in good lighting conditions such as bright sunny days.
INTERNATIONALE ORGANISATION FÜR STANDARDISIERUNG 200 is a superb general goal film for slower lens such as those found on compact cameras or zoom lenses. In print out film this speed has basically replaced ISO 75 as the quality of modern films have wheat comparable or greater than previous year’s ISO 100.
INTERNATIONALE ORGANISATION FÜR STANDARDISIERUNG 400. Where you require faster shutter speeds to use it shots or in medium to low lighting conditions. Grain is getting noticeable with this velocity.
ISO 1000 or faster. Use in low light conditions such as in the house and at dusk. Wheat is quite noticeable. A single can exploit this producing in grainy, gritty images.
As film ages its colour changes. This colour cast is subtle but noticeable. Intended for example, a brand new film fresh from the factory might have a small red colours solid in which the same film (and same batch) that has sat on a shop’s shelf for a 12 months might have a moderate green cast. At some point in its time the film will come with an optimum colour balance in which the colour cast is the very least.
For print film this effect can usually be ignored as the image labs’ printing machines will automatically compensate for this cast and produce appropriate prints (though probably inaccurate). Slide film is more sensitive due to truth that you view the film itself not styles.
The maker knows this and will endeavour to have the film delivered and the shelves when it is almost at optimum so that is optimum (or near-optimum) for the time it is expected to be on the shelves. Think of fruit in the corner shop. The new bananas appear slightly green and mature on the shelves.