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How to attach camera to Olympus BH2?

Posted: Tue Apr 02, 2019 8:02 am
by cooperplace
I've inherited a BH2 with a trinoc head. The trinoc head has an Olympus part U-PMTVC on it, which has a c-mount. There's an objective in it, marked
"NFK 3.3xL
125"

I'd like to take still color photos with this microscope. Is there a quick, easy way I can attach a 35mm digital camera body to this?
thanks

Re: How to attach camera to Olympus BH2?

Posted: Tue Apr 02, 2019 8:09 am
by MichaelG.
Alan Wood has all the information you are likely to need
... This is a good 'landing page'
http://alanwood.net/photography/olympus ... scope.html

MichaelG.

Re: How to attach camera to Olympus BH2?

Posted: Tue Apr 02, 2019 9:06 am
by cooperplace
thanks, yes I saw that. It doesn't answer the question: can a c-mount be used to satisfactorily attach a 35mm camera?

Re: How to attach camera to Olympus BH2?

Posted: Tue Apr 02, 2019 12:20 pm
by MichaelG.
cooperplace wrote:thanks, yes I saw that. It doesn't answer the question: can a c-mount be used to satisfactorily attach a 35mm camera?
A c-mount does not have the clear aperture to cover a 35mm frame, and its flange to image plane distance is shorter than of many 35mm cameras.
... So the short answer would be NO
[ depending, I suppose, on your definition of 'satifactorily attach' ]

A micro 4/3 camera would be a much more realistic proposition.

MichaelG.
.
P.S. What 35mm camera are you planning to use ?

Re: How to attach camera to Olympus BH2?

Posted: Tue Apr 02, 2019 12:25 pm
by MichaelG.
cooperplace wrote: There's an objective in it, marked
"NFK 3.3xL
125"
No, that's a projection eyepiece not an objective
... May I suggest that you look again at Alan Wood's site.

MichaelG.

Re: How to attach camera to Olympus BH2?

Posted: Tue Apr 02, 2019 3:39 pm
by Tom Jones
I use that very setup to project, essentially direct project as the NFK 3.3x and 0.3x lens in the U-PMTVC essentially cancel magnifications, onto the sensor of my Panasonic GH4 for 4K video. Since the GH4 is mirrorless, a C-mount adapter fits fine, and I get the necessary final corrections in the NFK eyepiece.

That is what I used to shoot this on a BHS: https://www.nikonsmallworld.com/galleri ... er-feeding

I used the same setup on a SZH stereo to shoot this: https://www.youtube.com/watch?v=OMNHuab9hKE

Mirrored cameras will need an Olympus Photomicro Adapter L, an easier to find Diagnostic Instruments PA1-10A, or another adapter of the same length and T-mount, along with a projection lens. Full frame takes an NFK 2.5x projection eyepiece, and APS-C sensors take the very pricey NFK 1.67x for optimal coverage. There are other adapters available, both with and without internal lenses that you can use to adapt the projection dimensions to your sensor. Understand each resolution on each sensor may have different dimensions. On my GH4 4K UHD and 4K DCI use different dimensions on the sensor. Look in your user guide to see the effects of different resolutions on the pixel dimensions used.

Tom

Re: How to attach camera to Olympus BH2?

Posted: Tue Apr 02, 2019 5:01 pm
by Scarodactyl
If you don't mind the look this is a very cheap and effective solution: viewtopic.php?f=12&t=7329
You'd want to get an nfk 2.5x eventually for full frame, but the 3.3 you already have would probably be just fine for the mean time it would just produce some cropping.

Re: How to attach camera to Olympus BH2?

Posted: Tue Apr 09, 2019 4:44 am
by georgetmacro
I have an Olympus CH with a BH-2 trinocular head. I have made a mount for Nikon F ( I use microscopy dedicated Nikon D200) but was not satisfied with it so have ordered one from an Ebay supplier in America, (newhopper (4872)). His price was US$59 with a 'make an offer' option. I got mine ordered for US$47 plus US$21 postage and ~US$12 customs. The total was AU$116. I thought this was OK because the supplier makes them up to suit the parfocal arrangement of the microscope. Although mine is probably not quite right given that it is a hybrid CH/BH-2.

Re: How to attach camera to Olympus BH2?

Posted: Sun Nov 10, 2019 7:44 pm
by DennyNY
Tom Jones wrote:
Tue Apr 02, 2019 3:39 pm
I use that very setup to project, essentially direct project as the NFK 3.3x and 0.3x lens in the U-PMTVC essentially cancel magnifications, onto the sensor of my Panasonic GH4 for 4K video. Since the GH4 is mirrorless, a C-mount adapter fits fine, and I get the necessary final corrections in the NFK eyepiece.
Hi Tom.
Is this setup parfocal?
I got old Lumix g3, looks like the same sensor size
I want to replicate yours setup.
Thank you.

Re: How to attach camera to Olympus BH2?

Posted: Sun Nov 10, 2019 9:48 pm
by Tom Jones
It can be. The U-PMTVC has screw threads that will allow you to adjust it's length a bit to make it parfocal. Adjust focus in the right eyepiece, match it with the left, then adjust the U-PMTVC (screw it in or out) until the camera focus matches what you see in the eyepieces. I use a -H focusing eyepiece on the right side to fine-tune it.

Tom

Re: How to attach camera to Olympus BH2?

Posted: Wed Nov 20, 2019 6:25 pm
by DennyNY
Tom Jones wrote:
Sun Nov 10, 2019 9:48 pm
It can be. The U-PMTVC has screw threads that will allow you to adjust it's length a bit to make it parfocal. Adjust focus in the right eyepiece, match it with the left, then adjust the U-PMTVC (screw it in or out) until the camera focus matches what you see in the eyepieces. I use a -H focusing eyepiece on the right side to fine-tune it.

Tom
Thank you Tom for your respond.
I got all setup but Im having problem on focusing part.
My U-PMTVC screwed all in and picture looks almost sharp. It looks like a little more in and it will be perfect, but i cant adjust any more signs U-PMTVC already all in.

Do i missing somthing or mine microscope defective? (I got it from Craigslist)

I have access to the lathe machine. I can lower NFK lens a little but not sure if will be helpful.
Thank you.

Re: How to attach camera to Olympus BH2?

Posted: Thu Nov 21, 2019 8:17 am
by Tom Jones
Are you saying you cannot get the camera by itself in focus, or cannot get the camera focus and eyepiece focus to match?

If the camera image won't come into focus, something is wrong.

Re: How to attach camera to Olympus BH2?

Posted: Thu Nov 21, 2019 3:45 pm
by Scarodactyl
The flange distance is probably too long on your camera. (Sensor is too far inside the camera).

Re: How to attach camera to Olympus BH2?

Posted: Thu Nov 21, 2019 5:25 pm
by Tom Jones
Some of the available micro 4/3 C-mount adapters don't like the flat top on the U-PMTVC and won't screw on completely before they bottom out. Mine just barely makes it.

That could make the adapter-camera sensor distance too long even with the adapter fully screwed together.

Re: How to attach camera to Olympus BH2?

Posted: Thu Nov 21, 2019 9:30 pm
by DennyNY
Tom Jones wrote:
Thu Nov 21, 2019 8:17 am
Are you saying you cannot get the camera by itself in focus, or cannot get the camera focus and eyepiece focus to match?

If the camera image won't come into focus, something is wrong.
Yes , I can't get focus match.
I guess its an adapter.

Re: How to attach camera to Olympus BH2?

Posted: Fri Nov 22, 2019 11:31 am
by jfiresto
Does your trinocular BH2 provide an intermediate ISO 38 mm photo port? I have seen references to a 38 mm clamp or dovetail, and was wondering if it is was one and the same.

If it is, I know a couple ISO to c-mount adapters that will (just) fully spin into most c-mount to micro four thirds thread adapters. (You have to bury the c-mount flange a little into the camera's to match its flange focal distance.) I also have one that won't.

Re: How to attach camera to Olympus BH2?

Posted: Fri Nov 22, 2019 7:59 pm
by DennyNY
jfiresto wrote:
Fri Nov 22, 2019 11:31 am
Does your trinocular BH2 provide an intermediate ISO 38 mm photo port? I have seen references to a 38 mm clamp or dovetail, and was wondering if it is was one and the same.

If it is, I know a couple ISO to c-mount adapters that will (just) fully spin into most c-mount to micro four thirds thread adapters. (You have to bury the c-mount flange a little into the camera's to match its flange focal distance.) I also have one that won't.
Yes i do have 38mm dovetail port.
Im working with CAD software applications and I'm planing to recreate dovetail post with lite adjustments in demention and print on 3D printer.

Re: How to attach camera to Olympus BH2?

Posted: Sat Nov 23, 2019 5:36 am
by DennyNY
Ok it works,
I make 3D printed version of dovetail with small modification.
I bring NFK lens lower by 5 millimeters and it allow me to adjust focus via U-PMTVC.
If anyone interested in 3d file let me know i will share.
Thank you everyone who try to help me.

Re: How to attach camera to Olympus BH2?

Posted: Sat Nov 23, 2019 7:05 am
by Scarodactyl
Changing the position of the nfk projective is likely going to have some sort of optical consequence--raising it certainly does anyway.

Re: How to attach camera to Olympus BH2?

Posted: Sat Nov 23, 2019 10:26 pm
by Tom Jones
I use this Fotodiox C-m4/3 adapter with the U-PMTVC for my BHS and SZH: https://www.adorama.com/fdcmft.html?gcl ... t4QAvD_BwE

It screws down flush against the PMTVC adapter, but works fine with the GH4. The adapter is even slightly unscrewed to adjust focus.

Re: How to attach camera to Olympus BH2?

Posted: Sun Jan 26, 2020 3:32 pm
by Bnh
The Olympus "Photomicro Adapter L" has a fixed aperture at the bottom. Please, can anyone tell me or measure me the diameter of the aperture and the distance from the base of the adapter to the aperture?

I am in the process of building a phototube for my BH2 microscope and I have a lathe for this purpose.

Re: How to attach camera to Olympus BH2?

Posted: Sun Jan 26, 2020 5:01 pm
by photomicro
Bnh wrote:
Sun Jan 26, 2020 3:32 pm
The Olympus "Photomicro Adapter L" has a fixed aperture at the bottom. Please, can anyone tell me or measure me the diameter of the aperture and the distance from the base of the adapter to the aperture?

I am in the process of building a phototube for my BH2 microscope and I have a lathe for this purpose.
10mm diameter.

Re: How to attach camera to Olympus BH2?

Posted: Mon Jan 27, 2020 10:23 am
by david_b
And 21mm from the base to the aperture

Re: How to attach camera to Olympus BH2?

Posted: Wed Jan 29, 2020 7:23 pm
by thomas.schwarz
This is perfect with Nikon D3300 also 100% parfocal. Thank to Boss at dealcorner.com for the right tube and adapter and testing with D3300...