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Thomas 1100100500531 Siedentopf Binocular Compound Microscope, WF10x Eyepieces, 40x-1000x Magnification, Plan Objective, Achromatic Objectives, Brightfield, Halogen Illumination, Abbe Condenser, Iris Diaphragm, Mechanical Stage, 110V


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The Thomas 1100100500531 Siedentopf Binocular Compound Microscope has a pair of 10x widefield eyepieces, a reverse-mounted nosepiece with one plan objective and three achromatic objectives, halogen illumination, nested coarse and fine focus, a 1.25 NA Abbe condenser with iris diaphragm, and a mechanical stage. The Siedentopf binocular head has a pair of eyepieces with interpupillary adjustment, a fixed inclination to reduce eye and neck strain, and rotation capability to provide a more comprehensive view and enable sharing. A Siedentopf binocular head enables the viewer to change the interpupillary distance without changing the tube length, eliminating the need to refocus the image. A reverse-mounted nosepiece keeps objectives out of the way to prevent damage and contamination, and to enable more secure slide handling. The 4x objective is a plan objective that provides improved focus over the entire range of the viewing field. The other objectives are achromatic objectives that provide color correction of magnified images. The 40xS and 100xS objectives are retractable and spring-loaded to prevent damage to the slide or objective when focusing. The 100xS objective is also an oil objective that provides increased resolution over a standard objective. A compound microscope is used for inspection and dissection of specimens when two-dimensional images are desired.

The microscope has lower (diascopic) brightfield illumination that transmits light up through the specimen for enhanced visibility of translucent and transparent objects. Brightfield (BF) illumination allows the specimen to absorb light, resulting in a dark image on a light background. The halogen light source provides bright light in a concentrated path, and a rheostat controls the amount of light emanating from the lamp. The Abbe condenser can be adjusted to control the distance of the light from the stage and has an iris diaphragm to optimize the amount of light illuminating the specimen. The mechanical stage locks the slide into place and provides precise slide manipulation along the X- and Y-axes. Coaxial coarse and fine focus knobs are nested to speed focusing for left-and right-handed viewers.

Microscope Head and Optics Specifications
HeadBinocular, Siedentopf
Magnification range40x-1000x
Head inclination30 degrees
Eyepieces (18mm)WF10x
NosepieceQuadruple, reverse-mounted
Objective, plan4x
Objectives, achromatic10x, 40xS, 100xS (oil)

Microscope Illumination and Stage Specifications
Focus typeCoaxial nested coarse and fine
Condenser1.25 NA Abbe
Light sourceHalogen with rheostat, 12V/20W
DiaphragmIris
Illumination typeBrightfield
Stage typeMechanical
Stage dimensions140 x 135mm (W x D)
Stage travel range78 x 50mm (X-direction x Y-direction)
Power110V

W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back.

Microscopes are instruments used to enhance the resolution of an object or image. Types include compound, stereo, or digital. Compound microscopes use a compound optical system with an objective lens and an eyepiece. Stereo microscopes show object depth in a three-dimensional image. Digital microscopes are used to display an image on a monitor, rather than looking through a lens. Microscopes can have monocular (one), binocular (two), or trinocular (three) eyepieces, with varying magnification abilities. Magnification ability refers to the size of an image. Resolution, also known as resolvant power, refers to the clarity of the image. The interaction between field of view (FOV), numerical aperture (NA), and working distance (WD) determines resolution. Microscopes can control magnification through a fixed focus, or through a range of adjustments. They can also utilize LED, fluorescent, and mirror light sources to help control viewing capabilities. Microscopes are widely used in education, lab research, biology, metallurgy, engineering, chemistry, manufacturing, and in the medical, forensic science, and veterinary industries.

Thomas Scientific manufactures instruments, equipment, supplies, and chemicals for laboratory and scientific applications. The company, founded in 1900, is headquartered in Swedesboro, NJ. 

What's in the Box?

  • Thomas 1100100500531 Siedentopf Binocular Compound Microscope
  • (2) WF10x eyepieces, 18mm
  • 4x plan objective
  • 10x achromatic objective
  • 40xS achromatic objective
  • 100xs (oil) achromatic objective
  • Compound microscope provides high magnification for biological use and educational applications

  • Siedentopf binocular head with a pair of 18mm 10x widefield eyepieces, interpupillary adjustment, fixed 30-degree vertical inclination to reduce eye and neck strain, and 360-degree rotation capability to provide a more comprehensive view and enable sharing

  • Reverse-mounted nosepiece with a 4x plan objective that provides improved focus over the entire range of the viewing field, and 10x, 40xS, and 100xS (oil) achromatic objectives that provide color correction of magnified images

  • Brightfield, halogen illumination with rheostat and 1.25 NA Abbe condenser with iris diaphragm for clear examination and light control

  • Mechanical stage locks slide into place and provides precise slide manipulation along the X- and Y-axes, and coaxial nested coarse and fine focus knobs speed focusing

Product Information   Specifications for Thomas 1100100500531 Siedentopf Binocular Compound Microscope, WF10x Eyepieces, 40x-1000x Magnification, Plan Objective, Achromatic Objectives, Brightfield, Halogen Illumination, Abbe Condenser, Iris Diaphragm, Mechanical Stage, 110V Below:

Manufacturer Thomas Scientific
Brand Thomas
Model 1235B85EA
Item Weight 0.04 pounds
Package Weight 17.9 pounds
Package Size 11.6 x 9.3 x 9.3 inches
Units in Package 1

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