The illumination system of the standard optical microscope is designed to transmit light through a translucent object for viewing. In a modern microscope it consists of a light source, such as an electric lamp or a light-emitting diode, and a … Continue reading →

You will see more of an object on low power. The depth of focus is greatest on the lowest power objective. Each time you switch to a higher power, the depth of focus is reduced. Therefore a smaller part of … Continue reading →

10 Best Blue Cut Lenses & Blue Light Blocking Glasses 2021 Feiyold Blue Light Blocking Glasses. Anrri Blue Light Blocking Glasses. K Kenzhou Blue Light Blocking Computer Glasses. Aosm Blue Light Blocking Glasses. Lifeart Blue Light Blocking Glasses. Uvex Ultra-Spec … Continue reading →

By law, decorative contact lenses , whether they correct vision or not, require a prescription and proper fitting from an eye doctor. Any type of contact lens that can be purchased without a prescription is being sold illegally—and can pose … Continue reading →

A: No, if you have astigmatism, it’s essential that you wear specialized contact lenses because your condition can worsen if not. Can you wear astigmatism contacts without astigmatism? Rigid Gas Permeable (RGP) Contact Lenses Oftentimes, these lenses can correct astigmatism … Continue reading →

A standard lens, also known as a “normal lens”, is one which produces an image that roughly matches what the human eye sees, and which looks natural to the viewer. It sits between the telephoto lens and the wide angle … Continue reading →

When photographers use the words “long” and “short” to describe a lens, they’re talking about the magnification the lens provides. A longer lens provides more subject magnification–so you can stand farther from your subject and not have the subject appear … Continue reading →

The Rokinon lenses are a more digitized version, while the Samyang lens has a manual aperture and has great modifications especially in auto-focus features and electrical zoom. Many top Camera products like Canon, Nikon, Samsung, and Olympus have mounts with … Continue reading →

A D-type lens relays subject-to-camera-distance information to Nikon DSLRs that feature 3D Color Matrix Metering (all versions), 3D Matrix Metering, 3D Multi-Sensor Balanced Fill-Flash and i-TTL Balanced Fill-Flash. What does G and D mean on Nikon lenses? G: The lens … Continue reading →

The Leica M lenses are still smaller because of the lack of anything more than glass and a focusing mount in the lens, and because Leica expends a huge amount of effort in designing them to image well on both … Continue reading →

1988. The Nikon F4 was introduced to the world, in 1988, as a replacement for the workhorse F3, which had been brought to market eight years earlier. How much was the Nikon F4 new? The Nikon F4 debuted exactly thirty … Continue reading →

Now, there are presently three categories – LEICA DC lenses for compact cameras, LEICA DG lenses for the LUMIX G, and LEICA D lenses for digital SRLs. They are manufactured by Panasonic using measurement instruments and a strict quality assurance … Continue reading →

What are varifocal/multi-focal glasses? Unlike bifocal glasses lenses, varifocal glasses (or multifocal glasses) change prescription seamlessly throughout the lens – there is no definitive line between them like bifocals or trifocals. Are bifocals better than varifocals? Bifocals or varifocals may … Continue reading →

Canon’s EOS VR System begins with the RF5. 2mm F2. 8 L Dual Fisheye Lens which is Canon’s optical solution to the many challenges that have troubled VR image makers for years. Are VR lenses worth it? Yes. It works … Continue reading →

Use the condenser diaphragm to reduce the amount of light and increase the contrast of the image. Condenser Focusing Knob – This control is used to precisely adjust the vertical height of the condenser. Condenser Lens – This lens system … Continue reading →