Re: My finanl Report: Artefacts in digital photographic images. (Coolpix-problem)

The "famous" Coolpix series is discontinued. Also the 4500 are only sold out
of inventory. Nikon does not produce them since quite some time now. This
could explain why you did not receive any response. It seems that Nikon does
not worry too much about discontinued product lines. This company is
currently fighting an uphill battle against Canon.

Nevertheless, your report seems to overemphasize this problem. I have a
Nikon 990, which barely shows this artifact. Even while taking images from
blood cells or diatoms in brightfield using 100 oil immersion I can't see
these blobs or rings. However, when closing the condenser's aperture
diaphragm too much, the ring artifact can be made visible. But they show up
with SONY cameras as well. It's just a simple problem with zoom lenses on
these cameras. As you are pointing out correctly in your report, these zoom
lens artifacts get more clearly emphasized when using microscope objectives
with greater depth of focus (such as with a 100 oil with NA 1.40).

Gregor

"Klaus Henkel" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> Hello Micro-Friends!
>
> Having finished my report report on my investigations about the
> artefacts in digital photograpic images caused by Nikon Coolpix
> cameras some months ago I nevertheless waited for a feedback from
> Nikon, but I finally gave up now. There were no signs of response or
> cooperation. But then an interesting statement from Nikonbios
> department came to my knowledge. And now everything fits to my findings.
>
> If you still are interested in this Coolpix-matter, just click on the
> following LINK for reading my detailed REPORT:
>
> http://www.weihenstephan.org/~fsrklauhenk/coolpix-artefact-report.pdf
>