Question About Film Scanning Resolution

I recently purchased a film scanner (Pacific Image PF3650Pro3) which has a
maximum "Optical Resolution" of 3600 ppi.
When I scan at that resolution I end up with image files whose property
sheets say that they are 5148 x 3420. I would like to know how it is that I
appear to be getting higher resolution than the scanner is capable of
delivering.
Is my film scanner creating scans equal to 17.6 MP (5148 x 3420)????
I thought that my images would be 3600 x 2400, based on a 3:2 aspect ratio.
So how am I getting 50% more ppi than that?
If someone could help me understand these numbers I'd appreciate it.

Norman Nescio

Re: Question About Film Scanning Resolution

In article <1161533416.258681.75330@m73g2000cwd.googlegroups.com>,
LOL. And I thought that it was something like cable or electrical
connections. Thanks for answering my silly question.


THO

Re: Question About Film Scanning Resolution

you were
Well just to be clear this is what Alan said
"To get high res from film, the original image has to be from high
quality, sharp glass, perfectly focused, at the sharpest aperture, high
shutter speed, perfectly isolated camera, mirror lockup, in high
contrast lighting (preferably flash) with a sharp, highly detailed
subject. "
Now clearly all of these items that he is saying you have to have to
get high res from film don't seem to be needed with a digital sensor.
So the questin is why are they needed for film by not digital?
Scott


Scott W

Re: Question About Film Scanning Resolution

Umm, that isn't what Alan said, but it did sound like it was what you were
saying (even if, as we surely hope, you didn't mean to). This thread seems
to have got very badly lost in the woods somewhere.
Peter


Bandicoot

Re: Question About Film Scanning Resolution

It's significant that the truck driver was careful to avoid the fire
hydrant........:^)


William Graham

Re: Question About Film Scanning Resolution

Almost identical to ours.
--
-- r.p.e.35mm user resource: http://www.aliasimages.com/rpe35mmur.htm
-- r.p.d.slr-systems: http://www.aliasimages.com/rpdslrsysur.htm
-- [SI] gallery & rulz: http://www.pbase.com/shootin
-- e-meil: Remove FreeLunch.


Alan Browne

Re: Question About Film Scanning Resolution

Nope, and this is what they look like when they are backed into, in
this case by a cement truck.
http://www.pbase.com/konascott/image/68978430
This is the power box
http://www.pbase.com/konascott/image/68978610
Note it is shifted a few inches after the earthquake.
Scott


Scott W

Re: Question About Film Scanning Resolution

I thought they would at least contain junction boxes for underground
power, phone, cable access...
--
-- r.p.e.35mm user resource: http://www.aliasimages.com/rpe35mmur.htm
-- r.p.d.slr-systems: http://www.aliasimages.com/rpdslrsysur.htm
-- [SI] gallery & rulz: http://www.pbase.com/shootin
-- e-meil: Remove FreeLunch.


Alan Browne

Re: Question About Film Scanning Resolution

Those are the house numbers. He reason to put them up on boxes like
that is to give people something to back over with their cars.
Scott


Scott W

Re: Question About Film Scanning Resolution

Just to make this a bit easier there is an image from a 0.25 inch
square of my sensor.
http://www.pbase.com/konascott/image/68975516
BTW this was taken when it was sunny.
This is a square that is 989 pixels on a size, about 2% smaller then
what a 4000 ppi film scan would be for the same area.
This is a useful size because it can be compared to a set of scan
samples that Rafe B. has on his site.
http://www.terrapinphoto.com/jmdavis/
The lens I am using is the Canon 50mm f/1.8, a lens that fits my film
camera just fine.
The question is if the only way to get a sharp image with film is to
take the step you gave then how is it that this image is sharp and yet
it was hand held with no mirror lock up and a used a very cheap lens?
Why is it that hand holding a camera will ruin a film shot but not a
digital?
Scott


Scott W

Re: Question About Film Scanning Resolution

In article <1161465226.316901.303650@f16g2000cwb.googlegroups.com>,
Ok, so I'm going to ask a silly off-topic question ... what are those
white boxes at the driveway of every house? I've also seen them in other
photos of recently-built Hawaiian housing.


THO

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