nikon BD vs M objectives

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viktor j nilsson
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Location: Lund, Sweden

Re: nikon BD vs M objectives

Post by viktor j nilsson »

https://www.ebay.co.uk/itm/185198149499

Pretty decent images here.

Scarodactyl
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Re: nikon BD vs M objectives

Post by Scarodactyl »

https://www.ebay.com/itm/185675736298?m ... media=COPY
Nice setup just appeared on ebay with 4 bd plans, nikon coarse/fine post stand and illuminated semprex base. Needs an illuminator and trinoc head, plus dic nosepiece if desired, but it's a great setup for larger subjects a traditional scope can't handle without going too nuts with a measurescope. Not sure what you already have but this might be a good starting point, the one downside being how hard it is to find a loose illuminator with a rotating polarizer.

phansen39
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Location: Chicago USA

Re: nikon BD vs M objectives

Post by phansen39 »

Have a mostly working setup. Need to complete the lighting and camera 3d printed part.
My 3d printed rotatable sliders work fine for polorization. Am now looking the the dic setup.
The camera is a bit blurry just took the pic of the monitor with the phone. Camera 0.3 reducer lens needs to go in farther. It won't quite focus when the eyepieces are in focus.
Image
Image

phansen39
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Joined: Sat Oct 15, 2022 8:06 pm
Location: Chicago USA

Re: nikon BD vs M objectives

Post by phansen39 »

I tried a couple led lights not working great. So ordered 2 different spot point led modules. Will be here in a couple days.
https://www.digikey.com/en/products/det ... 1/14306822
https://www.digikey.com/en/products/det ... 01/6677124

The camera the chimney needs to be turned down and the inner part Needs to be opened up. so the reducing lens will fit.

phansen39
Posts: 30
Joined: Sat Oct 15, 2022 8:06 pm
Location: Chicago USA

Re: nikon BD vs M objectives

Post by phansen39 »

Quick work with a lathe.
Image

And some cad for the 3d printed parts for the camera and light.

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blekenbleu
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Rotating analyzer

Post by blekenbleu »

phansen39 wrote:
Mon Nov 28, 2022 5:55 pm
Have a mostly working setup. Need to complete the lighting and camera 3d printed part.
My 3d printed rotatable sliders work fine for polarization.
That vertical illuminator has in front a slot for analyzer A slider just below the head;
I have only ever seen fixed circular polarizer analyzer A sliders:
Image
... a rotating analyzer in that slot could be handy and something others (e.g. myself) would covet.
Quick work with a lathe.
Supposing that its thread might match e.g. 50mm filter,
I tried and failed to unscrew the top part of that trinocular 'T' phototube
using heat gun to unseize thread-locking compound;
perhaps some solvent and/or torch would work...?
Metaphot, Optiphot 1, 66; AO 10, 120, and EPIStar 2571
https://blekenbleu.github.io/microscope

phansen39
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Joined: Sat Oct 15, 2022 8:06 pm
Location: Chicago USA

Re: nikon BD vs M objectives

Post by phansen39 »

This is my current version of the polarizer and analyzer.
If the analyser could use a smaller lens say 18mm it could be made rotatable.
Any thoughts of using a 18 mm lens? Thinking it would be too small and may obscure some light.
I suppose we could do the cad if there is an interest.
Image

blekenbleu
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Re: nikon BD vs M objectives

Post by blekenbleu »

phansen39 wrote:
Tue Nov 29, 2022 6:34 am
If the analyser could use a smaller lens say 18mm it could be made rotatable.
Any thoughts of using a 18 mm lens? Thinking it would be too small and may obscure some light.
Optiphot's fixed analyzer A has 18mm polarizer opening;
A rotating 18mm filter might allow a 17mm polarizer opening, and I often crop images;
forfeiting 10% of possible field area seems IMO a tolerable trade-off for rotating analyzer convenience,
given that outer 6% of objectives' radius are often less ideal.

FWiW, given top and bottom holding things together,
perhaps teeth on rotating filter mount could be exposed on slider sides...
... but sourcing 19mm o.d. polarizing might be problematic,
and fitting a rotating 20mm o.d. filter in a 23mm wide slider seems a big ask.
Metaphot, Optiphot 1, 66; AO 10, 120, and EPIStar 2571
https://blekenbleu.github.io/microscope

phansen39
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Location: Chicago USA

Re: nikon BD vs M objectives

Post by phansen39 »

tech2020 on ebay has the 18 mm

phansen39
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Joined: Sat Oct 15, 2022 8:06 pm
Location: Chicago USA

Re: nikon BD vs M objectives

Post by phansen39 »

17 mm clear. 3d printed wil be about 16.8

https://www.thingiverse.com/thing:5667953

Image

Scarodactyl
Posts: 1617
Joined: Sat Apr 14, 2018 10:26 am

Re: nikon BD vs M objectives

Post by Scarodactyl »

Just as a general note the quality of the polarizer matters a fair bit. On my setup I was using an empty slider someone had glued a polarizer into (allegedly a nikon rep using it for demonstration) which had good but not perfect extinction, and when I finally got a real Nikon one it made a noticeable difference. Xpol is much snappier and DIC can get deeper blacks.

blekenbleu
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Re: nikon BD vs M objectives

Post by blekenbleu »

phansen39 wrote:
Tue Nov 29, 2022 4:35 pm
17 mm clear. 3d printed will be about 16.8
https://www.thingiverse.com/thing:5667953
Nice, knowing nearly nothing about 3D printing,
surprised that analyzer/EPI STL files are larger than those for stackable slider.
Now, to sort getting them printed...
Metaphot, Optiphot 1, 66; AO 10, 120, and EPIStar 2571
https://blekenbleu.github.io/microscope

phansen39
Posts: 30
Joined: Sat Oct 15, 2022 8:06 pm
Location: Chicago USA

Re: nikon BD vs M objectives

Post by phansen39 »

Dont print them yet. needs to be test fitted etc.
I will post when its good.
The thickness is for the plastic polarizer about 1 mm not the glass one. Don't know how thick they are.

Uploaded the stackable to the latest.

phansen39
Posts: 30
Joined: Sat Oct 15, 2022 8:06 pm
Location: Chicago USA

Re: nikon BD vs M objectives

Post by phansen39 »

The glass polarizer is 2.7 mm thick. does not leave much room
The analyzer has just enough room for the glass.
Image

phansen39
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Location: Chicago USA

Re: nikon BD vs M objectives

Post by phansen39 »

Files updated on thingiverse.
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