"Green Xenon [Radium]" <glucegen1@[EMAIL PROTECTED]
> wrote in message
news:480e9386$0$3361$4c368faf@[EMAIL PROTECTED]
> Ken Hart wrote:
>> "Green Xenon [Radium]" <glucegen1@[EMAIL PROTECTED]
> wrote in message
>> news:480e43da$0$4092$4c368faf@[EMAIL PROTECTED]
>>> Ken Hart wrote:
>>>
>>>
>>>> As for the characteristics of the film, a finer grain film will allow
a
>>>> quicker change in density, allowing a higher frequency sound to be
>>>> recorded for a given speed of trans****t.
>>>
>>> What is the finest grain that can be achieved?
>>
>> Generally speaking, the lower the film speed (the sensitivity of the
film
>> to light expressed as "ISO"), the finer the film's grain. Check with
the
>> manufacturer to determine the finest grain, usually expressed as line
>> pairs.
>> I have never used a film in the manner you are exploring, so I can't
give
>> exact answers; I can only answer in terms of 'pictorial' use of film.
>
>
> Can a film with a lower ISO handle a louder sound without clipping than
a
> film with a higher ISO? I ask because I get the feeling that if there
> grains are finer, the film can record more levels of amplitude -- just
> like a 16-bit audio file can handle 65536 loudness levels while an 8-bit
> audio file can handle only 256 loudness levels. I could be very wrong
> though. Not sure if this is a good analogy at all.
Yes. a finer grain film should be able to handle more discretely different
loudness levels, however, the film developement will determine will the
first and last loudness level will be. (There are films which are designed
to render exposure as either black or white- such films, while very fine
grained would yield little dynamic range.) To continue your analogy (which
isn't really far off), imagine setting all the lower bits to one (or
zero).
Or imagine setting the higher bits all to zero (or one). Under
developement
or over developement could cause this. Additionally, (just to throw a
curveball into your analogy!), the bits in the middle are not evenly
spaced.
I think that if you check out the response curve of different films, this
may become more clear, or hopelessly muddled! Film doesn't have a straight
line response to the amount of light hitting it. Whether that response
matches audio's log curve, I don't know.
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