Re: Nikon D70 DSLR on microscope: Update

From: GTO (gregor_o_at_NOSPAMyahoo.com)
Date: 12/29/04 

Date: Wed, 29 Dec 2004 07:29:09 GMT

The dynamic range of digital vs. film needs some clarification. A dedicated
microscopy camera with a 14 or even 16-bit A/D offers a comparable dynamic
range to the one of color negative film (up to 9 f-stops). The 12-bit A/D of
most digital cameras offers at least as much dynamic range as color slide
film (5 to 6 f-stops).

If an image feature causes bright reflections, proper episcopic illumination
with a polarizer can help a lot. I used a Nikon CF BD Plan 50x objective
with episcopic illumination to look at metal surfaces (such as coins)
without any problems even with a digital recording device with only 10-bit
A/D (http://geocities.com/gregor_o/USCoin03.jpg).

Gregor

"Richard J Kinch" <kinch@truetex.com> wrote in message
news:Xns95CEFCBA5E41someconundrum@216.196.97.131...
> KBob writes:
>
>> I'm trying to shoot the irregular
>> surface of a silver amalgam filling, and the specular highlights from
>> the mercury specks (or something) is making this task difficult.
>
> All digital cameras have very, very narrow dynamic range, compared to
> film.
> Highly dynamic scenes like yours are a problem. You have groups of
> entirely washed-out pixels, and surrounded by more pixels that are color-
> aberrated.
>
> This would seem to require some kind of non-linear optical filter to
> correct (does that exist?).

Relevant Pages

  • Re: How far...
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    (rec.photo.digital)
  • Re: DSLR vs P&S a replay of Film vs Digital?
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    (rec.photo.digital)
  • Re: Digital newbie looking for camera
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  • Re: DSLR vs P&S a replay of Film vs Digital?
    ... "A good match for 10-bit cameras" means that the two are ... and the film maybe even wins. ... fabrication. ... 3.0, or roughly about 631:1, for 56 dB of dynamic range. ...
    (rec.photo.digital)
  • Re: Megapixels and noise
    ... ISOs on current cameras, 16-bit A/Ds would help too for the ... A 14-bit A/D has a dynamic range of 84 dB. ... I don't know what the current crop of sensors looks like ...
    (rec.photo.digital.slr-systems)