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[filmscanners] RE: Re:digitising slides



Very interesting bit of information Jack.

Unfortunately, as I read it, it make take as long to copy the slides with a
digital camera using this techniques as it would to scan them using a
scanner when all is said and done between taking the three exposures and
piecing them together in PS - not to mention the equipment and space
requirements to set up the copy setup ( e.g. tripods, Beseler colorhead or
other source of controlable diffuse projected light source, remote shutter
release, etc.)  Unless one has the equipment already and the space, it might
be cheaper to get a good film scanner.

I know the statment says:
        I piece the three exposures together in a PS script to get a density 
range
        that would make a drum scanner blush.  Scans as fast as you can hit the
        shutter release 3 times.
However, it is unclear first how long it takes to devise and establish the
correct PS script for piecing the three exposures together, second if the
same script is appropriate for all slides no matter what their original
nature and density ranges are, and third the amount of time it takes to
export the three exposures to PS and place them one the appropriate leayers
that are to be pieced together.  This is not a criticism per se; but it is
only meant to say that it may not be as simple and quick as the statement
implies - "Scans as fast as you hit the shutter release 3 times."

It is also unclear how the paragraph on the relationship of exposures to
layers relates to the PS script since the rest of the statement talks about
3 exposures but this talkes about as many as 17 layers.

I would be interested in hearing any additional elaborations on this.

-----Original Message-----
From: filmscanners_owner@halftone.co.uk
[mailto:filmscanners_owner@halftone.co.uk]On Behalf Of Jack Phipps
Sent: Friday, April 25, 2003 9:41 AM
To: laurie@advancenet.net
Subject: [filmscanners] RE: Re:digitising slides


Guten Tag Rob!
As a matter of fact our chief scientist has done just that.

Here is an excerpt from someone asking a similar question on another forum:

If the exposures are equal, you want to average them equally.  In layers
this means the bottom should be 100% and the next 50%.  Now the third should
be 33% so that you see 1/3 of that layer, and 2/3 of half of each below, do
the math, exactly 1/3 of all three.  Fourth layer should be 1/4 or 25%,
fifth should be 1/5...  17th should be 1/17.

Be very careful.  I use a "big'ol" tripod, set the D100 to pre-mirror-up
with time delay, and a remote shutter release and even then it is VERY hard
to hold sub-pixel alignment.  Don't try this with a telephoto lens or
outside in the wind.

I use this to scan slides.  I have the D100 set to bracket three exposures
at the widest range, and a Bessler colorhead with diffuse illumination.  I
piece the three exposures together in a PS script to get a density range
that would make a drum scanner blush.  Scans as fast as you can hit the
shutter release 3 times.  Use this technique when you need to capture a
brightness range outside the ability of your digital camera.

End of excerpt.

As you can see, he takes three pictures of each slide to give him the
quality he wants.

I hope this helps!

Jack Phipps
Applied Science Fiction

-----Original Message-----
From: Op's

has anyone done a comparison on copying a slide with a digital camera
say Nikon D100 60mm macro lens (6Mp 17M tiff file) with scanning it to a
file with a film scanner?

I was thinking of putting all my old slides to CD and a film scanner
would take too long

has anyone used this method and how do the results compare?

Thanks

rob

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