RE: filmscanners: Magnification of light - AND brief density math lesson...

[rafeb <rafeb@channel1.com>]

At 02:29 PM 6/18/01 -0400, Austin wrote:

[rafe b:]
>> And BTW, when Austin talks about 5080 dpi from 35 mm film,
>> he probably should have mentioned that it takes about an hour
>> or so to produce that scan, in RGB.  I hope you're not in
>> a hurry. <g>

[Austin:]
>That's not entirely true.  It depends on the exposure time, and how new the
>bulb is.  If you set exposure to min, it will scan in around %20 the time.
>
>B&W is single pass, and can use min exposure, so it is really comparable to
>the newer scanners in terms of scan time.


I'm afraid I don't understand.  Doesn't the proper exposure 
depend on the image under consideration?

That's certainly been the case for the film scanners that I've
worked with.  I admit that the illuminant can vary a bit in 
intensity, but you're saying it can vary over a 5:1 range??? 


rafe b.