Levenhuk 850B Biological Binocular Microscope

Magnification: 40–1000x. Infinity plan achromatic objectives, light source – LED 3W, stage with two specimen holders, Köhler illumination

Binocular

The microscope head is a core element of the microscope that you look through to see a magnified sample

40 — 1000

How much the size of a sample increases when you observe it through a microscope

Laboratory/medical

Application and use of the microscope

Availability

Product ID	24611
Brand	Levenhuk, Inc., USA
Warranty	lifetime
EAN	5905555004464
Package size (LxWxH)	20.5x15.4x12.6
Shipping Weight	19.6

Description

The Levenhuk 850B is a binocular biological microscope with plan achromatic optics for brightfield observations in transmitted light. It is used in various types of medical centers for urological, dermatological, biological, biochemical, anatomopathological, cytological, and general clinical laboratory research.

The microscope is equipped with a 360º rotatable binocular head with a 30º inclination angle and a 4-objective revolving nosepiece. The revolving nosepiece with objectives is oriented toward the interior – the user can see the objective inserted into the optical path, and the space above the stage is free. The interpupillary distance is adjustable over a wide range. 10x eyepieces with a 22mm field of view are included in the set, which allows you to view a large area of the specimen.

The focusing of the microscope is adjusted by coarse and fine focusing knobs. The focusing knobs move the stage in the vertical plane and also move it horizontally along two mutually perpendicular axes. The stage does not have a positioning rack. The low positioned stage knob enhances the user experience. The specimen holder is designed for two samples. Thanks to the soft focusing adjustment and stage movement mechanism, it is moved smoothly and effortlessly.

The use of an LED light source increases the resolution of the microscope. The LED is mounted in the base, it is brightness-adjustable, and it lasts a long time before needing a replacement. The aperture and field diaphragms allow for the Köhler illumination method. The illuminator is powered by an AC power supply (220V power cord is included).

Key features:

Binocular head, digital camera mounted in one of the eyepiece tubes
Magnification range: 40–1000x, plan aromatic optics
Abbe condenser, aperture and field diaphragms, Köhler illumination
Stage without a positioning rack and with two specimen holders
Coaxial coarse and fine focusing mechanism
LED illumination (transmitted light) with brightness adjustment
Retractable collector for easy LED replacement
AC power supply

The kit includes:

Microscope base, revolving nosepiece, condenser, stage, built-in transmitted light illuminator, and power supply
Binocular head
Plan achromatic objectives: 4x, 10x, 40xs, 100xs (oil)
Eyepiece WF10x/22mm (2 pcs.)
Blue filter
Bottle of the immersion oil
AC adapter
Dust cover
User manual and warranty card

Caution: Please refer to the specifications table for the correct mains voltage and never attempt to plug a 110V device into 220V outlet and vice versa without using a converter. Remember that mains voltage in the U.S. and Canada is 110V and 220–240V in most European countries.

Some things you can see under a microscope:

The photo shows slides from Levenhuk ready-made specimen kits.

The Levenhuk 850B microscope is compatible with Levenhuk digital cameras (not included). Levenhuk cameras are installed in the eyepiece tube instead of an eyepiece.

specifications

Product ID	24611
Brand	Levenhuk, Inc., USA
Warranty	lifetime
EAN	5905555004464
Package size (LxWxH)	20.5x15.4x12.6
Shipping Weight	19.6
Type	biological, light/optical
Head	binocular
Optics material	optical glass
Nozzle	360 ° rotatable
Head inclination angle	30 °
Magnification, x	40 — 1000
Eyepiece tube diameter, in	0.9
Eyepieces	WF10x/22mm (2 pcs.)
Revolving nosepiece	for 4 objectives
Interpupillary distance, in	1.9 — 3
Stage, mm	210x150
Stage moving range, mm	75/55
Stage features	mechanical double-layer, with specimen holders, two-axis mechanical stage, without a positioning rack
Eyepiece diopter adjustment, diopters	±5
Condenser	N.A. 1.25
Diaphragm	built-in aperture and field
Focus	coaxial, coarse (24mm) and fine (0.002mm)
Body	metal
Illumination	LED
Brightness adjustment	✓
Power supply	110–220V
Light source type	3W LED
Light filters	blue
User level	experienced users
Assembly and installation difficulty level	easy
Application	laboratory/medical
Illumination location	lower
Research method	bright field
Pouch/case/bag in set	dust cover

References
and downloads

User manual: Levenhuk 800 microscopes (pdf)

(PDF, 29.16 Mb)

High-resolution images (zip)

(ZIP, 78.4 Mb)

click to
download

Questions and Answers

Cory Laframboise (2018.12.05)

Why is buying a trinocular microscope the best choice when it comes to microphotography?

Customer service:

Dear Cory, thank you for interest in Levenhuk products. Because the camera can be connected to the third eyepiece. Levenhuk trinocular microscopes have a rotatable head with tree objectives. Basically only two eyepieces are used to observe the specimen and the third connects to a digital camera. Is there any additional information you might need?

Radek (2018.09.27)

I own 850B model and it is fantastic. I would like to upgrade it with camera. Is it possible to buy separately trinocular head (I guess it's exchangable) or only option would be to buy camera and install it on existing binocular eyepiece? Thanks.

Customer service:

Hi Radek,
Thanks for your question!
The only option would be to purchase camera separately and install it into one of the eyepieces.
Thank you!

Matthew Sanchez (2018.01.29)

does the microscope have a dark-field condenser? the manual doesn‘t have a word about it. some comments below confirm my conjectures, and so do the photos…

Customer service:

Levenhuk 850B Microscope is equipped with a built-in dark-field condenser. It can be used when the Abbe condenser is lifted up. To start observations in dark field mode, turn the illumination ring counterclockwise, and to return to the bright field, turn the ring clockwise.

Emily Lane (2017.06.22)

We need a microscope for hematological studies at home. We decided to get 850B model, is this microscope phase-contrast (we were advised to get a phase-contrast one). How does this feature facilitate research?

Customer service:

Levenhuk 850B binocular microscope is suitable for haematological studies, but it is not phase-contrast.

Dennis Cook (2017.05.12)

Are the eyepieces equipped with a measuring ruler? Is the object-micrometer for calibration included in the set?

Customer service:

The eyepieces of Levenhuk 850B binocular microscope are not equipped with a measuring ruler. An object-micrometre for the dimension calibration is not included in the set.

Alex Chandeller (2017.03.22)

Where can I buy a dark field condenser for this microscope

Customer service:

The Levenhuk 850B Biological Binocular Microscope has a built-in dark field condenser.

jonathan (2017.02.23)

Can with microscope come with LED light bulb

Customer service:

Hello! The microscope’s illumination system includes a halogen lamp 6V/20W

Ted Avery (2015.06.23)

Hello, is this model suitable for metallographic studies?

Customer service:

Unfortunately, Levenhuk 850B Biological Binocular Microscope is not suitable for this purpose as it allows observing only transparent objects.

John Snyder (2014.12.10)

No. Thank you.

Customer service:

John, please do not hesitate to contact us if you need any assistance.

John Snyder (2014.12.09)

Thank you for your answer. I have seen some other microscope specs (other brand) with working distance twice as much. That's why I asked.

Customer service:

Dear John, thank you for your reply. I double checked with our experts and they confirmed that it will be enough working distance. Is there any additional information you might need?

John Snyder (2014.12.06)

Hello! Specifications of 850B looks great. However user manual for 850B says that working distance for 100x objective is only 0.158mm (0.006in). But this is typical thickness of cover slips. Does is mean that one must buy ultra-thin cover slips for this microscope to have some room for focusing on the sample under the slip?

Customer service:

Dear John, thank you for interest in Levenhuk products! Yes, it is a standard working distance for 100x objectives. You will be able to use a standard cover slips. Is there any additional information you might need?

Jessie Rivers (2014.04.10)

Hello!
The first question for you... Is there specimen holder? I'm pretty sure that there is... but you haven't mention it in the description, but on the picture I can see something like that.
And the second question... I'm choosing between this microscope and Levenhuk 670T. Levenhuk 670T has a trinocular head and I'm going to purchase a digital camera soon any way... but this model has dark field condenser and objectives must be better... I have no idea what to choose... But this darkfield method is quite interesting and useful... I can observe transparent microorganisms in liquids...

Customer service:

Yes Levenhuk 850B model has a specimen holder. Due to its built-in dark field condenser this model will be preferable. Also, take a look at Levenhuk D870T Digital Trinocular Microscope - http://www.levenhuk.com/catalogue/microscopes/levenhuk-d870t-8m-digital-trinocular-microscope/

Anthony (2013.11.29)

I can't adjust eyepieces, the image splits in two. Could it be a factory defect?

Customer service:

First of all, try to relax your eyes when you look in both eyepieces, change interpupillary distance until you get desired image. Diopter adjustment should will be useful. If nothing works then you should contact our Service Center, telephone numbers and addresses you can find in your warranty, or just call us: 800-342-1706.

Quron Keith (2013.10.27)

What a great microscope!
Wonderful gift!

Customer service:

Thank you for your feedback on Levenhuk 850B Biological Binocular Microscope!

George (2013.09.16)

How much is Levenhuk 870?

Customer service:

The price of the Levenhuk 870T Biological Trinocular Microscope is $899.95.

Anthony Henderson (2013.08.21)

The dark field condenser for what magnification is required, dry or wet?

Customer service:

Dark field condenser is required for work with 100x oil immersion objective.

Leo Martin (2013.08.05)

Great microscope! The best holiday gift ever!

Customer service:

Thank you for you comment on the Levenhuk 850B Biological Binocular Microscope!

Joi Leitner (2013.08.02)

The package arrived yesterday. What a wonderful thing! And yesterday I got tonsillitis. So I wanted to ask 1) Can I see virus or bacteria in the source of inflammation? 2) Where should I drop this oil? A) between glasses b) between the objective lens and the cover glass?
3) do you have a set with gloves, forceps, dyes?

Customer service:

1. Microbes can be seen only with a special preparation and the sample must be stained.
2. Immersion oil should be placed between the cover glass and the objective lens .
3. No, unfortunately, we do not have such a set in our range of products.

Tim Wheeler (2013.07.24)

Is it possible to set a phase-contrast device on this microscope? How much will it cost for this microscope? what manufacturers?

Customer service:

Phase contrast installation, unfortunately, is not possible.

Andrew Bridges (2013.07.04)

got this microscope and in the kit comes a bottle of oil. Tell me, is it immersion oil? And one more question.
This microscope has white and black rings on one objective (others have only one), so it means that it's possible to use both oil and water with this microscope?

Customer service:

Yes, it is immersion oil, it is used with 100x objective. You can't use water with objectives.

Samantha Wilson (2013.06.01)

If I want to set a camera I have to install it in place of one eyepiece? With a camera can I measure a size?

Customer service:

1. Yes, digital camera is installed instead of one of eyepieces.
2. Yes, it's possible to conduct measurements by using digital camera.

Matthew (2013.05.28)

Can I place a scale for measurements of cubital index on this microscope? It should be placed on both eyepieces? Is it difficult to measure this way?

Customer service:

Unfortunately, the accessory you are interested in is not available in our online store, there is no possibility to provide you with accurate specifications. As an alternative model for measurement, we can offer the Levenhuk M35 BASE Digital Camera: http://www.levenhuk.com/catalogue/accessories/microscope-accessories/microscope-digital-cameras/levenhuk-m35-base-digital-camera/

Matthew (2013.05.27)

and this camera? How's the quality?

Customer service:

We guarantee assembly reliability and exceptional quality of the optics.

Matthew (2013.05.27)

Can you clarify - where should I place the drop of immersion oil (on the condenser lens itself - between the condenser and the slide; or between the objective lens and the cover glass?)

Customer service:

You should place a drop of immersion oil on the cover glass and then lower the objective so it can touch the drop. Oil works as a binding medium between the cover glass and the objective lens and thus increases the resolution of produced images.

Matthew (2013.05.27)

For what the dark field condenser is required?

Customer service:

Dark-field study is required in cases when it cannot be conducted using bright field method, for example dark-field method is used for blood cell examination.

Matthew (2013.05.27)

The dark field condenser is so expensive? Can I set a camera on this microscope if it has a binocular head?

Customer service:

1. Yes. dark field condenser isn't cheap.
2. Yes, you can attach a camera to the Levenhuk 850B Biological Binocular Microscope.

Scott (2013.05.26)

Does this camera have a good picture quality? Are there any templates?

Customer service:

Please specify the model of the digital camera that you are interested in.

Claire Veltri (2013.05.11)

Good afternoon! Is it possible to set Levenhuk C130 and Levenhuk C310 on this microscope? Thanks in advance!

Customer service:

Yes, it is possible to attach these cameras to the Levenhuk 850B Biological Binocular Microscope.

Bob Mutel (2013.04.16)

1. Are objectives 4x, 10x, 40x, 100x PLAN 4X-40X achromatic or plan? It is specified that only 100x is plan while the eyepieces all have the abbreviation'plan'. If achromatic, then are there separate plan and super plan objectives 10x and 4x? 2. Is there only lower lighting? Can I get this result (on the pic) using dark field method (completely black background, but the object is perfectly visible) or it was done with the help of something else? {{ {{ http://upload.wikimedia.org/wikipedia/commons/thumb/c/c5/Mysis2kils.jpg/220px-Mysis2kils.jpg.link.link }} }}
can I buy a camera separately and use it with this microscope? or should I buy trinocular? is there adapters for this microscope for digital cameras such as Nikon

Customer service:

1. PLAN objectives, suitable objectives and eyepieces, as separate accessories, are not available at the moment.
2. Yes, there is only lower lighting. Yes, theoretically it's possible.
3. Yes, it's possible, direct your attention to these models: http://www.levenhuk.com/catalogue/accessories/microscope-accessories/microscope-digital-cameras/ . The best choice will be a trinocular microscope. Unfortunately, adapters are not available at the moment.

George Bugher (2013.03.16)

5. Are the objectives parfocal, is focus needed while changing the eyepiece?
6. What filters come in the kit?
7. Is there any case for transporting the instrument?

Customer service:

5. The focus is required.
6. This model currently comes with 3 filters (blue, green, orange)
7. The dust cover is included in the kit.

George Bugher (2013.03.16)

Questions:
1. What objectives are included in the kit (achromatic, apochromatic); 2.
what'PLAN'means in 100x objective; 3. what cameras can be used with it; 4. if I use the camera MVV3000 (the description says that it should be installed in place of the eyepiece), then will it reduce the magnification?

Customer service:

1. The Levenhuk 850B Biological Binocular Microscope is equipped with Plan achromatic objectives.
2. "PLAN" mark at the end of the line means that all objectives are plan-achromats.
3. We recommend Levenhuk digital cameras for microscopes: http://www.levenhuk.com/catalogue/accessories/microscope-accessories/microscope-digital-cameras/ .
4. The increase is calculated according to the fact that the camera itself has 10x magnification.

Walter Miller (2013.03.05)

Hello, can I use the digital camera C310 with Levenhuk 850B.

Customer service:

Yes, you can.

David Lewis (2013.03.02)

1. Why do we need two pairs of eyepieces? 2. how can I adjust the diopter and why there's only one diopter adjustment ring. 3. where is the black field condenser and when I need to use it. 4. Where, in what cases and what filters I need to insert?

Customer service:

1. For obtaining different magnification power.
2. The diopter adjustment is done by rotating the right eyepiece. One eye adapts to another, it's enough to adjust only one eye. 3. The condenser is situated under the stage, there are objects that should be studied only in dark field. 4. Filters should be inserted also under the stage, there is a special recess for installation. Different studies require different contrast. Can you clarify what exactly are you going to study?

David Lewis (2013.03.01)

I don't quite understand. I will specify my previous question. Why can't I just use one filter (blue or yellow, for example). What's the difference between them? Or different specimens require different color filter?

Customer service:

You can observe with or without filters. Some objects can be seen better with blue filter; some of them with yellow.

Kate Murphy (2013.02.25)

Why do I need filters of different colors?

Customer service:

Coloured filters are required for contrast enhancement while observing thin and transparent objects.

Kate Murphy (2013.02.24)

What's the difference of using filters of different colors?

Customer service:

In contrast enhancement while observing thin and transparent objects.

Kate Murphy (2013.02.24)

1. In what cases I can use immersion oil? 2. For observing what kinds of slides the dark field condenser is needed? 3. Can I purchase separately filters for this microscope, if something happens to them?

Customer service:

1. You will need immersion oil while using 100x objective.
2. Thin and transparent.
3. Unfortunately, we don't sell these filters separately.

Kate Murphy (2013.02.22)

Can you give me advice? What experimental kit will be the best addition to this microscope, in case I want to buy the most complete and high-quality set that you have.

Customer service:

Consider Levenhuk N80 NG "See all" Slides Set: http://www.levenhuk.com/catalogue/accessories/microscope-accessories/prepared-microscope-slides/levenhuk-n80-ng-see-it-all-slides-set/

Kate Murphy (2013.02.22)

Thank you so much for the link. great full instructions for this type of microscope. But, unfortunately, I haven't found the answer to my question.

Customer service:

In the kit you will find: 2 eyepieces (WF 10x, 20x), 4 objectives (4x; 10x; 40x; 100x PLAN), adapter, built-in dark field condenser, microscope.

Kate Murphy (2013.02.22)

Is this microscope equipped with a filter holder? Are filters included in the kit? If the answer is yes, then what are they exactly?

Customer service:

Yes, it is equipped with a filter holder.
3 filters (yellow, green and blue) are included in the kit.

Kate Murphy (2013.02.22)

What comes with the Levenhuk 850B in the kit?

Customer service:

You can find this information here: https://loc.levenhuk.com/upload/uf/250/gin2a1m925y8wm9skbxwtiuyaita19er/lvh-microscopes-800-um-ml.pdf

Kate Murphy (2013.02.21)

1. For what studies I need filters and a dark field condenser? 2. Is there any chance of sample damaging while using 40 and 100 objectives?

Customer service:

1. Filter is used, for example, for hematoxylin and eosin staining. The dark field condenser is crucial for observing live unstained microorganisms (examination of bacteria mobility, that are not visible in bright field) 2. No, objectives can't damage the sample.

Kate Murphy (2013.02.20)

I use set of slides Levenhuk N80 NG See all!

Customer service:

For studying Levenhuk N80 NG "See all" Prepared Slides Set there's no need for any additional accessories.

Ronald T. (2013.02.19)

Can I use filters with this model?

Customer service:

Yes, you can use filters with the Levenhuk 850B Biological Binocular Microscope.

Kate Murphy (2013.02.11)

Please, tell me, how can I prepare samples? And what's the difference between glass slides and cover slips?

Customer service:

This information can be found in microbiology textbooks and on the Internet. The glass slide - that's where you put the sample, the cover slip covers it. Consider Levenhuk K50 Experiment Kit which has everything you need to prepare microscope slides yourself.

Kate Murphy (2013.02.10)

Can I prepare live bacteria or blood samples by myself at home?

Customer service:

Yes, it is possible. Take a look at the Levenhuk K50 Experiment Kit http://www.levenhuk.com/catalogue/accessories/microscope-accessories/microscope-experiment-sets/levenhuk-k50-experiment-kit/ .

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