Re: Inexpensive 3 Megapixel USB color digital cameras
- From: "Graybald" <r911g@xxxxxxxxx>
- Date: 6 Feb 2007 12:38:33 -0800
On Feb 5, 4:21 pm, "GTO" <grego...@xxxxxxxxxxxxxxx> wrote:
Most likely, your Periplan ocular was made for the Leitz scopes using a
170mm mechancial tube length and your tried to use it on Zeiss and Olympus
scopes that use a 160mm mechancial tube length.
The reason why then the Leitz Periplan does not work well enough with
Olympus and Zeiss is the fact that the mechanical tube length for Leitz was
170mm and its optical tube length was 152mm, which is way different from the
160mm mechanical tube length and 150mm optical tube length of the Olympus
and Zeiss. Remember, good quality objectives are less forgiving to changes
in optical tube length and in order to make a Periplan ocular work on a
Zeiss or Olympus requires either significant refocusing (very bad!) or you
need to add 10mm spacer to your photoport. With a 10mm spacer added to your
photoport, your older Leitz Periplan ocular should work just fine, even with
expensive Olympus gears.
If you used a Leitz ocular for 160mm mechnical tube length, there might be
yet another reason why you were not sucessful using it on an Olympus.
Cheers,
Gregor
"Tom" <joe@.com> wrote in message
news:8oxxh.31557$uW.3086@xxxxxxxxxxxxxxxxxxxxxxxxx
Lower cost lenses usually have ghost images. The Ghost images appear as
lines that seem to float around. I don't think one camera and lens can
work with all microscopes. Different microscope manufacturers have more
correction in the eyepiece or the objective depending on the manufacturer.
I've had good luck mounting my leitz periplan 28mm threaded eypiece to my
Nikon Coolpix 995 camera. It works perfectly with my Leitz microscope but
not to well with my Olympus, Nikon, Wild and Zeiss microscopes.
"Graybald" <r...@xxxxxxxxx> wrote in message
news:1170448071.304315.169490@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
There are some 3 megapixel USB 2.0 color digital microscope cameras
being listed on eBay for much less than I would have thought
possible.
For example, see:
http://cgi.ebay.com/3-0M-PIXELS-MICROSCOPE-COLOR-DIGITAL-CAMERA-2-0-U...
or
http://cgi.ebay.com/3-0-MEGAPIXEL-MICROSCOPE-COLOR-DIGITAL-CAMERA-USB...
Does anyone have experience with these cameras?
I am considering one for a brightfield reflected light (metallurgical)
microscope or on a stereo microscope. Therefore low light capability
is not an issue.
Graybald- Hide quoted text -
- Show quoted text -
----------
Thank you all for your comments.
Kevin Cunningham and Beats:
I was hoping that someone might recognize this product. My guess was
that it could have begun as an astronomy camera but then was
repurposed.
Heinrich:
I had not looked at the Canon Powershot cameras since I already had a
Nikon Coolpix 995. However, the Canons are apparently easier to
remote control. Are you using Canon software or the Breeze PSR Remote
software?(http://www.breezesys.com/index.htm
Gregor and Tom:
Tube length differences are not the only reason why photo eyepieces
from another manufacturer may not produce excellent results when used
on a microscope. Some microscope designs used compensating
eyepieces. Ted Clarke has discussed the topic in the July 2004 issue
of Microscopy Today in an article titled "Chromatic Aberration in
Digital Photomicrographs from Microscopes Requiring Compensating
Eyepieces". You can download the magazine issue (as a giant 15Mb .pdf
file) from the archive at http://www.microscopy-today.com/cgi-bin/
MTWWWListingSQL.plhttp://www.microscopy-today.com/cgi-bin/
MTWWWListingSQL.pl
(Scroll down below the cumulative index to find the back issues).
I have used a Nikon Coolpix 995 with a Mark Simmons eyepiece http://
www.perspectiveimage.com/index.php
The Coolpix 995 is known to have artifacts under certain conditions.
See Gordon Couger's discussion at
http://www.couger.com/microscope/shootout/shootout.html
My main gripes with the Coolpix is the inconvenience of swapping out
CF cards and of trying keep track of the actual magnification
including the zoom setting.
I am still looking for the digital equivalent of a Nikon F3 with a
DW-4 6X right angle viewfinder and M screen. That "universal
camera"setup would let me go from overall views of a subject to macro
and micro images, all with one camera. The closest digital equivalent
I have seen is the new Olympus Evolt E-330 DSLR with the Live View LCD
electronic viewfinder. The viewfinder apparently can be displayed
remotely and the camera controlled via a PC.
Graybald
.
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