All very interesting but flawed mathematics. My Canon 1Ds blows away
all 35mm film, though my Hasselblad with Flextight scans are tough
competition.
I know this is all expensive gear but just do the maths on 10,000 shots
I have taken with my Canon in the last six months when compared to
film. Include the time element into the equation, scanning and
cleaning up and I'm afraid there is no competition.
Regards
Steve Townsend
On Tuesday, September 23, 2003, at 07:02 am, Green, Peter wrote:
Gooday all, I greatly enjoy this little pot boiler and would like to
add my two bobs worth.
I shoot 35mm 60 x 45 mm and PAL DV formats, and I am looking to shoot
big quicktime panorammas in future.
I shoot digital video for moving images, because of cost, image
quality, and low light sensitivity.
I shoot 35mm neg because of cost, (my 25 year old OM2 is paid for),
image quality and the ability to shoot three minute time exposures or
a full roll of film in less than 10 seconds.
This is my guess at the math.
35mm film is 24mm x 36mm unmounted.
Thats 24, 36 = 864 sq mm of sensor area.
Film resolution is around 80 line pairs per mm. That means 80 black
lines and another 80 white lines per mm.
24 x 160 = 3840 lines
36 x 160 = 5760 lines
3840 x 5760 = 22,118,400 dots or chemical pixels.
A Kodak pro photo cd scan of a 35mm neg/slide comes out at around
18Mb medium res or 72Mb high res, so a 22 megabit resolution for film
seems plausable.
The film has three or four layers to pick up colour for each pixel.
If we say each of three layers resolves 256 shades, then we have
22,118,400 x 24/8 or
66, 355200 bytes of data.
If you think you can use 16 bits per pixel, like photoshop, then we
have 22,118,400 x 48/8 or
132,710,400 bytes of data.
On a good day with a favourable breeze it seems you can squeeze at
least 20Mega bytes of data out of a 35mm frame. If thats not enough
you can shoot 60 x 70 mm medium format film.
60 x 70 = 4200 sq mm of sensor area.
How many of the digital cameras stack their photo sensors on top of
each other to capture three or four colours at once the way film does?
Does this mean I divide the number of megapixels by three or four to
get the effective colour resolution?
How many digital cameras have effective 22 megapixel resolution at
full colour?
I look forward to the day when I can buy a 25 megapixel camera for
$500.
:) Peter
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