I am going to the DDW medical conference, at the end of the month in Chicago.
Thought I might take a little time off, to see area, although I have spent time
doing a bit of sight-seeing there before.
Anybody got any favourite recomendations of things to do,places to go see
there?
thanks,
Tim Hughes
--- On Tue, 5/5/09, Tim Hughes <timhughes@xxxxxxxx> wrote:
> From: Tim Hughes <timhughes@xxxxxxxx>
> Subject: Re: [OM] clever use of available sensor real estate
> To: "Olympus Camera Discussion" <olympus@xxxxxxxxxxxxxxxxx>
> Date: Tuesday, May 5, 2009, 5:04 AM
> <Good to see you back, Tim. >
>
> Hi Chuck,
> thanks, I have not been checking this list much
> lately, although I had some off list correspondence with
> some people about a few things recently.
>
> I have been playing with a Mobilight 300J Studio flash at
> the moment, which was a keh non working unit. Fairly simple
> unit which comes with a battery pack too, so you can use it
> away from the studio, off line. They have a rather dangerous
> high voltage connector on it, which you can easily stick
> your fingers in , if not careful. Quite amazing in a modern
> unit to have such a dangerous setup. I am going to change
> the connector ,so I can use it with Quantum turbo style
> cables as well.
>
> Tim Hughes
>
> --- On Tue, 5/5/09, Chuck Norcutt
> <chucknorcutt@xxxxxxxxxxxxxxxx> wrote:
>
> > From: Chuck Norcutt
> <chucknorcutt@xxxxxxxxxxxxxxxx>
> > Subject: Re: [OM] clever use of available sensor real
> estate
> > To: "Olympus Camera Discussion"
> <olympus@xxxxxxxxxxxxxxxxx>
> > Date: Tuesday, May 5, 2009, 4:05 AM
> > Good to see you back, Tim. It's been a long time
> since
> > one of these
> > insightful posts.
> >
> > Chuck Norcutt
> >
> > Tim Hughes wrote:
> > > I read their position paper and I think some of
> the
> > claims are
> > > overblown and maybe in some cases specious:
> > >
> > >
> >
> http://www.fujifilm.com/photokina2008/pdf/release/super_ccd_exr_e.pdf
> > >
> > >
> > > It looks like when running in 6Mpixel modes there
> are
> > some advantages
> > > in some ways, but not really in 12 mpixel mode.
> The
> > mode with
> > > increased dynamic range is an example where it
> maybe a
> > fairly good
> > > tradeof, but you land up in a mode pretty close
> to
> > 6Mpixel rather
> > > than 12.
> > >
> > > For example it appears the traditional beyer
> pattern,
> > which is
> > > optimised for highest resolution in green, since
> this
> > is human eyes
> > > peak sensitivity and peak sunlight wavelength,
> will
> > have higher
> > > horizontal resolution than the new exp pattern.
> This
> > actually even
> > > adds a little more since the eye/brain aparently
> also
> > subjectively
> > > percieves it to be highest reolution if it has
> > greatest resolution in
> > > the horizontal direction.
> > >
> > > The new exp patern is quite strange in that the
> > highest resolution in
> > > green is on the left diagonal , with all other
> > directions being
> > > lower! This is non-optimal since horizontal is
> best
> > subjectively. The
> > > beyer has equal, but reduced by 45% resolution
> on
> > both
> > > diagonals,while the vertical and horizontal are
> the
> > the highest and
> > > equal.
> > >
> > > The exr horizontal green resolution, is lower
> than the
> > beyer, at
> > > 12Mpix because of diagonal pattern. Because of
> the
> > unsymetrical
> > > spacing of exp, it also aliases at even lower
> > resolution than you
> > > would normally imagine from that raw color pixel
> > count. If you
> > > photographed a thin curved line object like a
> hair
> > say, it would
> > > produce some additional low frequency aliasing
> because
> > sampling was
> > > more non-uniform ,at different angles than beyer.
> > (think: if a line
> > > pair is sampled by two close spaced pixels then
> they
> > get resolved,
> > > but the next pair of pixels in exp are now more
> widely
> > spaced, so the
> > > next adjacent line pair is not resolved)
> > >
> > > The wide dynamic range option which is really
> more
> > like 6mpixel,
> > > since it selects best exposure from two diagonal
> > pixels, then has
> > > uniform sampling, at least at a particular
> brightness
> > level.
> > >
> > > The claim that there is less aliasing from
> binning
> > diagonally left
> > > adjacent pixels in exr, rather than more widely
> > separated ones
> > > (bayer), is complex to analyse and is more
> orientation
> > dependent than
> > > beyer.
> > >
> > > However, because the beyer samples at a higher
> > horizontal frequency
> > > than the non-uniform exr, then binning two
> horizontal
> > (or vertical)
> > > pixels in beyer, still has lower aliasing, since
> the
> > actual sampling
> > > was done at a higher resolution (frequency) thus
> > having lowest
> > > aliasing.
> > >
> > > The s/n ratio improvement is exactly the same for
> > equal area
> > > photo-diodes in the two technologies. In this
> > comparison for the
> > > bayer at 6mpixels, the optimal bining for best
> > subjective and actual
> > > resolution, would be combining vertical pixels.
> > >
> > > Tim Hughes
> > >
> > >
> > >
> > >
> > > --- On Fri, 5/1/09, usher99@xxxxxxx
> > <usher99@xxxxxxx> wrote:
> > >
> > >> From: usher99@xxxxxxx <usher99@xxxxxxx>
> > Subject: [OM] clever use of
> > >> available sensor real estate To:
> > olympus@xxxxxxxxxxxxxxxxx Date:
> > >> Friday, May 1, 2009, 2:12 PM
> > >>
> >
> http://www.dpreview.com/reviews/fujifilmf200exr/page2.asp
> > >>
> > >> Moose might be amused that low light
> performance a
> > few generations
> > >> later still doesn't really exceed the
> > F30/31--the latter are still
> > >> expensive.
> > >>
> > >> Not many Moose sightings of late.
> > >>
> > >> A Trace Worried Mike --
> > >>
> >
> _________________________________________________________________
> >
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> > --
> >
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