[Rockhounds] achieving depth of field w digicam?

[J Bryan Kramer]

Here is a macro DOF calculator, use 22.5 as the sensor width for a Canon
crop frame camera like yours. At f/45 on a 30 mm object the most DOF you
could get is 5mm and you would suffer loss of resolution at that f/stop.
You'd need very bright lights too. At a more reasonable f/16 you drop back
to 1.7mm DOF.

BK

On Wed, Apr 16, 2008 at 7:59 PM, Kreigh Tomaszewski <Kreigh at tomaszewski.net>
wrote:

> Tim,
>
> The classic trick might work. More light and a higher f stop to get more
> depth of field.
>
> Kreigh
>
>
>
> Tim Jokela Jr. wrote:
> >
> > This one goes out to the digital photography gurus out there.
> >
> > I was talking to a buddy last night about macrophotography of small
> fossils,
> > 1-3cm stuff, and how capturing any depth of field continues to be the
> major
> > challenge. He suggested three ways of doing it: buy the $25,000 camera
> > system made to do the job, take the picture 3 meters away from the
> specimen
> > and blow up the image, or take multiple shots, focusing on different
> areas,
> > and stitch them together with Helicon, Combine-Z, or the expensive new
> > version of PhotoShop.
> >
> > All are basically horrible options.
> >
> > So, is there anything new and interesting in the world of digital
> > photography that's giving depth of field to macrophotography in a
> simple,
> > affordable manner? (My weapon of choice atm is a Canon Digital Rebel
> with a
> > 50mm macro lens.)
> >
> > Many thanks for any info!
> >
> > Tim Jokela Jr., tjokela at execulink.com
> > Business: http://www.element51.com
> > Pleasure: http://www.ontariominerals.com
> >
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-- 
"Photography, as we all know, is not real at all. It is an illusion of
reality with which we create our own private world."
Arnold Newman


J Bryan Kramer
North Florida, USA
photos at:
http://pbase.com/photoburner


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