Unexpected problems - Olympus 2,5 X NFK and 10 X Splan Apo
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Unexpected problems - Olympus 2,5 X NFK and 10 X Splan Apo
A couple months ago I purchased my new FF camera Pentax K-1.
What was surprised when I took my first micrographs. On almost every image appeared light ring. See image below.
I was searching the source of that light ring in various places of my BH-2.
I looked inside the trinocular head, to the condenser, lamp house ect. It was very frustracing. But yestarday I had an idea that the source of the problem (round gleam of light) can be just in my Olympus 2,5 X NFK. I made thin black paper ring and inserted it next to lower lens of the 2,5 X NFK. It works !!! Hurra !
When I was using my Pentax K-5 with its APS-C sensor the ring of light was simply outside the sensor. When I used full frame sensor the light ring appeared on the camera sensor.
But I do not understand why the light gleam has appeared. As far as I know the 2,5 X NFK was cornstructed to cooperate with 24 x 36 mm frame. What is wrong ?
The second problem concerns my Olympus 10 X Splan Apo. Some day its rear big lens simply felt out The objective was never broken, newer felt from the table on the floor ect. What happened ?! I would not ever expect such case with so quality microscope objective. Does anybody know such case ? Now I have to look for the new objective. I tried to insert the lens to the objective but the obtained images were poor quality (not so sharp and small contrast). The objective doesn't fit for using
I hope my experience, at least with 2,5 X NFK, will be helpful for others who had similar problem with FF camera. Any remarks will be very appreciated.
Marek
What was surprised when I took my first micrographs. On almost every image appeared light ring. See image below.
I was searching the source of that light ring in various places of my BH-2.
I looked inside the trinocular head, to the condenser, lamp house ect. It was very frustracing. But yestarday I had an idea that the source of the problem (round gleam of light) can be just in my Olympus 2,5 X NFK. I made thin black paper ring and inserted it next to lower lens of the 2,5 X NFK. It works !!! Hurra !
When I was using my Pentax K-5 with its APS-C sensor the ring of light was simply outside the sensor. When I used full frame sensor the light ring appeared on the camera sensor.
But I do not understand why the light gleam has appeared. As far as I know the 2,5 X NFK was cornstructed to cooperate with 24 x 36 mm frame. What is wrong ?
The second problem concerns my Olympus 10 X Splan Apo. Some day its rear big lens simply felt out The objective was never broken, newer felt from the table on the floor ect. What happened ?! I would not ever expect such case with so quality microscope objective. Does anybody know such case ? Now I have to look for the new objective. I tried to insert the lens to the objective but the obtained images were poor quality (not so sharp and small contrast). The objective doesn't fit for using
I hope my experience, at least with 2,5 X NFK, will be helpful for others who had similar problem with FF camera. Any remarks will be very appreciated.
Marek
Last edited by Marek Mis on Wed Sep 13, 2017 12:03 am, edited 1 time in total.
Olympus BH-2 with 10x SPlan Apo objective, 2.5x NFK photo eyepiece and full-frame Canon EOS 5D Mark II is my favourite combination. Lovely images, and definitely no light ring.
Do you see a light ring with all of your objectives?
Are you using the Photomicro Adapter L or something else?
My set-up is here:
http://www.alanwood.net/photography/oly ... scope.html
Alan Wood
Do you see a light ring with all of your objectives?
Are you using the Photomicro Adapter L or something else?
My set-up is here:
http://www.alanwood.net/photography/oly ... scope.html
Alan Wood
Re: Unexpected problems - Olympus 2,5 X NFK and 10 X Splan A
Yes, the rear lens is bonded on to the lens cell, not precision fit into a cell.Marek Mis wrote:
The second problem concerns my Olympus 10 X Splan Apo. Some day its rear big lens simply felt out The objective was never broken, newer felt from the table on the floor ect. What happened ?! I would not ever expect such case with so quality microscope objective. Does anybody know such case ?
Marek
A cost cutting measure at odds with the term "quality"
I am not young enough to know everything.
The only exception is 4 X objective. In the rest of my objectives (S plan achromats and S Plan Apochromats) the problem exists.Alan Wood wrote:Olympus BH-2 with 10x SPlan Apo objective, 2.5x NFK photo eyepiece and full-frame Canon EOS 5D Mark II is my favourite combination. Lovely images, and definitely no light ring.
Do you see a light ring with all of your objectives?
Are you using the Photomicro Adapter L or something else?
My set-up is here:
http://www.alanwood.net/photography/oly ... scope.html
Alan Wood
The width (not the diameter) of the light ring changes due to opening or closing condenser diaphragm (aperture). It is thinner and better visible (sharper) when the condenser aperture is small. The problem disappear when I insert black paper ring into the NFK.
I think that can be another reason of the light ring. Perhaps the distance of my camera to the NFK is too short and the diameter of the light ring is enough small to fit FF sensor in my K-1. Perhaps in your set this distance is much longer so your FF Canon sensor is not able to see it.
I am not sure what distance should be propper. I am enclosing image with the way of connecting my camera with to microscope with detailed description.
Last edited by Marek Mis on Thu Sep 14, 2017 2:10 am, edited 1 time in total.
Re: Unexpected problems - Olympus 2,5 X NFK and 10 X Splan A
Unfortunately my English is not excellent so I would like you to write the second sentence in other words ?Choronzon wrote:Yes, the rear lens is bonded on to the lens cell, not precision fit into a cell.Marek Mis wrote:
The second problem concerns my Olympus 10 X Splan Apo. Some day its rear big lens simply felt out The objective was never broken, newer felt from the table on the floor ect. What happened ?! I would not ever expect such case with so quality microscope objective. Does anybody know such case ?
Marek
A cost cutting measure at odds with the term "quality"
Re: Unexpected problems - Olympus 2,5 X NFK and 10 X Splan A
If a microscope objective is truly a quality one, lenses don't simply fall out.Marek Mis wrote:Unfortunately my English is not excellent so I would like you to write the second sentence in other words ?Choronzon wrote:Yes, the rear lens is bonded on to the lens cell, not precision fit into a cell.Marek Mis wrote:
The second problem concerns my Olympus 10 X Splan Apo. Some day its rear big lens simply felt out The objective was never broken, newer felt from the table on the floor ect. What happened ?! I would not ever expect such case with so quality microscope objective. Does anybody know such case ?
Marek
A cost cutting measure at odds with the term "quality"
I am not young enough to know everything.
The Photomicro Adapter L has a baffle just above the top of the photo eyepiece. It is recessed too far for me to measure accurately, but the central hole is about 9 mm diameter.
It's function could be to reduce stray light.
The distance from the sensor to the ledge on which the top section of the photo eyepiece rests should be 150.0 mm.
The figure of 125 that Olympus uses seems to be measured from the sensor to the exit pupil of the photo eyepiece.
I don't get a light ring with any objectives, and I have used from 2x to 100x.
Alan Wood
It's function could be to reduce stray light.
The distance from the sensor to the ledge on which the top section of the photo eyepiece rests should be 150.0 mm.
The figure of 125 that Olympus uses seems to be measured from the sensor to the exit pupil of the photo eyepiece.
I don't get a light ring with any objectives, and I have used from 2x to 100x.
Alan Wood