Odd apearence in the microscope.
Odd apearence in the microscope.
(OP)
Hello !
This is not about materials, but hopefully some of you have seen this before when looking into microscopes.
Here where I am an intern we have an old Carl Zeiss Jena microscope that im using regularly.
Out of nowhere, yesterday, some dark shades appeared over the screen. I have tried to localize where they come from and from what makes sense its from the glass where the view is split into the ocular and the camera and to right before the magnification lenses.
I have tried to lighty dust of any possible glass/filters from the bulb to the magnification lenses but they still apear and it is like they form a "filter" over all images and magnifications.
I have attached 1 photo where you can see the dark shades, and a seconond one where i tried to focus on the shades. To me it looks like cracks.


Anyone who can come with an input about this ?
This is not about materials, but hopefully some of you have seen this before when looking into microscopes.
Here where I am an intern we have an old Carl Zeiss Jena microscope that im using regularly.
Out of nowhere, yesterday, some dark shades appeared over the screen. I have tried to localize where they come from and from what makes sense its from the glass where the view is split into the ocular and the camera and to right before the magnification lenses.
I have tried to lighty dust of any possible glass/filters from the bulb to the magnification lenses but they still apear and it is like they form a "filter" over all images and magnifications.
I have attached 1 photo where you can see the dark shades, and a seconond one where i tried to focus on the shades. To me it looks like cracks.


Anyone who can come with an input about this ?





RE: Odd apearence in the microscope.
I had a similar issue before, and when I block the light that hits on oculars the effect was cleared.
It also looks like wave interference pattern.
RE: Odd apearence in the microscope.
TTFN
I can do absolutely anything. I'm an expert!
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers
RE: Odd apearence in the microscope.
But do try in a dark room first, and also look into alignment of the light and mirrors.
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P.E. Metallurgy, Plymouth Tube
RE: Odd apearence in the microscope.
@IRstuff. Yes i was trying to catch the best picture of the "flaw" but even when i turn up the light its still there. We have recently changed the buld to a un original bulb. It worked fine until yesterday, but it might be the bulb.
@EdStainless. Sounds logic with what im thinking looking at the microscope. It is an old lady so im leaning towards something in the lane. I will try later in dark and see what happens.
Thank for your quick respons !
RE: Odd apearence in the microscope.
We have a winner!
The location of the bulb in the housing can be very important. Usually, there is an adjustment so the bulb can be moved forward, backward, up, and down. You need to adjust the bulb so the filament is "out of focus" with respect to the focal plane of the microscope lenses.
This happened to me the first time I replaced the bulb in a metallograph. It was doing just fine, but I noticed similar shadows on the photographs. I discovered that by moving the bulb, the shadows moved. From there, it was easy to determine how I had to move the bulb to eliminate the shadows.
RE: Odd apearence in the microscope.
TTFN
I can do absolutely anything. I'm an expert!
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers
RE: Odd apearence in the microscope.
@IRstuff, Im not so familiar with dark field microscopy but i dont think it is ? i just had the light turned down a bit to make the flaw stand out
RE: Odd apearence in the microscope.
TTFN
I can do absolutely anything. I'm an expert!
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers
RE: Odd apearence in the microscope.
TTFN
I can do absolutely anything. I'm an expert!
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers
RE: Odd apearence in the microscope.
= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube
RE: Odd apearence in the microscope.
The bulb was faulty, there was nothing to see on the bulb visually but another one made the "scratches" go away. We also found that some of the dark spot was spots on one of the deep internal lenses, we have been able to clean it a bit but some of the spots are almost burned into the glass.
But thanks to you all for your help, its useable for now.