This filter allows you to select a camera by the resolution (megapixels) of the camera.
Unless you are doing high quality printing, additional resolution over 3 megapixels may be wasted since most computer monitors have maximum resolution of approximately 2 megapixels.
Also, higher resolution typically involves slower refresh rates and, therefore, less effective live imaging.
Different color light passes through curved glass (a lens) at different angles. Achromatic lenses 'correct' for this 'spherical aberration' in order to bring the light rays into focus on the same plane.
The better the lens, the greater is the amount of correction or 'flat field'. There are three common achromatic lenses:
Achromatic - Standard on most microscopes with 65% flat field .
Semi-Plan - Better quality with 80% flat field
Plan - Premium lenses with 95% flat field
Most applications only require standard achromatic lenses. Semi-plan and plan lenses are typically for professional use.
Please note that Semi Plan and Plan filters also include E-Plan, S-Plan and U-Plan objectives.
Brightfield microscopes use transmitted (illuminated from below) white light that is absorbed by denser (darker) areas of the specimen to create contrast.
Darkfield microscopes improve the contrast in unstained, transparent specimens. They use scattered light that is not collected by the objective lens and so the light will not form part of the image. As a result, the specimen is illuminated against a dark background.
Epi-Fluorescence microscopes use the phenomena of fluorescent and phosphorescent light instead of, or in addition to, reflection and absorption.
are used to view specimens that require more working space than a slide. For example, specimens in containers such as petri dishes. They are also used for polished metal specimens where reflected light is required. The objectives are located below the stage while the light source and condenser are above the stage.
Metallurgical microscopes are a form of inverted microscope. They are designed for opaque or polished metal specimens that require high magnifications, but with reflected illumination (more typical in a stereo microscope).
Phase Contrast microscopes enable greater contrast in transparent specimens (protozoa etc) without the use of stains. Invented by Fritz Zernike, they convert small phase shifts in the light passing through the specimen into changes in contrast.
Polarizing microscopes employ polarized light that show changes in internal structure and composition of material not discernible with ordinary light.
Portable microscopes employ rechargeable LED batteries so they can be used outside in the field.
Teaching microscopes employ two or more microscope heads so that teacher and students can view the specimen, simultaneously.
CMOS (complementary metal oxide semiconductor) and CCD (charge coupled device) image sensors are two different technologies for capturing images digitally. Each has unique strengths and weaknesses, although there are no clear dividing lines.
CCD cameras have traditionally provided the highest image quality at the expense of system size and cost. This is beginning to change with the advent of S-CMOS sensors.
CMOS cameras offer more functions on the chip with lower power dissipation, but they have often required tradeoffs between image quality and cost.
As a result, most standard applications currently employ CMOS sensors with lower prices. More advanced applications, where highest image quality is essential, employ CCD sensors.
A high power or compound microscope achieves higher levels of magnification than a
stereo or low power microscope. It is used to view smaller specimens such as cell structures
which cannot be seen at lower levels of magnification.
A low power or stereo microscope typically employs objective lenses of 50x or less. It is used to view specimens that are visible to the naked eye such as insects, crystals, circuit boards and coins.
A stereo microscope has three key parts: