Bausch and Lomb 7801 vd microscope with a Budd base

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JCTyler
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Bausch and Lomb 7801 vd microscope with a Budd base

#1 Post by JCTyler » Thu Jun 02, 2022 1:37 am

I have a Bausch and Lomb 7801 vd microscope with a Budd base and additional Nikon assemblies. I want to use it but it seems to be missing parts and didn't come with a manual/instructions. Here are photos of what I have. Does anyone know how to setup the Nikon F adapter ? How am I supposed to light the subject? Is there a base to punt the Budd chassis to? Did this originally come with a stage that is missing; and if so can I make a substitute to replace it? The lens is a Gaertner 60 m/m EFL.

If anyone out there has any suggestions or tips, it would be greatly appreciated

Here's a link for the images

https://imgur.com/a/sDUOGXR

apochronaut
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Re: Bausch and Lomb 7801 vd microscope with a Budd base

#2 Post by apochronaut » Thu Jun 02, 2022 6:36 am

That 7801 VD is most likely a serial # not a model #. There isn't a lot of info. around for older industrial microscopes such as that. That one looks like an old Monozoom or Monozoom type of microscope. There are some more knowledgeable about B & L than I who might be able to help more.

BramHuntingNematodes
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Re: Bausch and Lomb 7801 vd microscope with a Budd base

#3 Post by BramHuntingNematodes » Thu Jun 02, 2022 11:10 am

This looks like a custom setup that uses an older b&l tubus as one component. The zoom optic is an eyepiece, similar to one made by Rolyn. I am unfamiliar with the objective but 60mm ef is about 4 or 5x. No cover glass would be warranted.

The Nikon F was an advanced camera system in the 1960s, but the housing may have been to hold a light, not sure exactly. The whole thing looks to be mounted in a swing arm to get around large immovable objects perhaps.
1942 Bausch and Lomb Series T Dynoptic, Custom Illumination

JCTyler
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Re: Bausch and Lomb 7801 vd microscope with a Budd base

#4 Post by JCTyler » Thu Jun 02, 2022 11:00 pm

I have a Nikon FG 20 so I'm familiar with the F mount. I ll see if there's a light that there in accessories on ebay or some nikon forums. Also what's a tubu?

BramHuntingNematodes
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Re: Bausch and Lomb 7801 vd microscope with a Budd base

#5 Post by BramHuntingNematodes » Fri Jun 03, 2022 12:56 am

The tubus is just the body tube. It looks like from a monocular scope.
1942 Bausch and Lomb Series T Dynoptic, Custom Illumination

JCTyler
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Re: Bausch and Lomb 7801 vd microscope with a Budd base

#6 Post by JCTyler » Fri Jun 03, 2022 4:31 am

If I'm missing a stage, what s the best way to light an object like a wasp sting or a cactus thorn? My magnification range is between 50x-200x.
Do I light from the top, bottom or side? Are the new modern LED ring lights something to look into for evenly lighting the subject? Is there a source for aftermarket stages;
should I build my own?

Greg Howald
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Re: Bausch and Lomb 7801 vd microscope with a Budd base

#7 Post by Greg Howald » Fri Jun 03, 2022 10:19 am

Regarding light from top, bottom, or side, the answer is yes.
And I would design my own stage using led lighting. One tip. When observing opaque specimens it is handy to have both a black and a white stage pad to put the specimen on. Some things look better with a black background while others look better with white. What a delightful project.
Enjoy. Greg

JCTyler
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Re: Bausch and Lomb 7801 vd microscope with a Budd base

#8 Post by JCTyler » Sat Jun 04, 2022 12:18 am

Is there significance to the angle of the base below the objective lens? It goes at an opposite angle to that of most stages I've seen.

Images linked below.

https://imgur.com/a/XhDagcs

JCTyler
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Re: Bausch and Lomb 7801 vd microscope with a Budd base

#9 Post by JCTyler » Tue Jun 07, 2022 2:39 am

Is there a calculator that converts mm to 4 or 5x ojective magnification? Also are Gaertner EFL lenses interchagable on the same microscope, if I wanted something with greater optical zoom? Would any other brands of lensese use the same mount?

BramHuntingNematodes
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Re: Bausch and Lomb 7801 vd microscope with a Budd base

#10 Post by BramHuntingNematodes » Tue Jun 07, 2022 3:53 am

Hmm 50mm is more like 2x now that I think about it.

https://vademecummicroscope.com/2015/03 ... ent-focus/
1942 Bausch and Lomb Series T Dynoptic, Custom Illumination

JCTyler
Posts: 18
Joined: Tue May 31, 2022 11:01 pm

Re: Bausch and Lomb 7801 vd microscope with a Budd base

#11 Post by JCTyler » Thu Jun 09, 2022 8:16 pm

Is there any way I can get specs on the bauch and lomb tubu I have? Is there any useful resource like electrotanya is for old electronics?

BramHuntingNematodes
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Re: Bausch and Lomb 7801 vd microscope with a Budd base

#12 Post by BramHuntingNematodes » Thu Jun 09, 2022 9:48 pm

You might try looking for some old catalogs .but the B&l part I can see is just a metal tube with a rack and pinion. The rest of this apparatus is a custom construction. I don't think the slanted part is a stage. I don't think this scope has or was meant.to.have a stage. It looks more like you move scope o er to the inspection site.
1942 Bausch and Lomb Series T Dynoptic, Custom Illumination

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