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The entrance pupil is the aperture stop as seen from the object side. It may not be identical to the physical aperture if there are lenses between the entrance and the aperture.

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The f-number of a lens is directly related to the maximum angles of output rays as obtained for parallel input rays: the tangent of that maximum angle is half the inverse f-number.

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Chromatic aberration is a kind of defect commonly found in simple lens systems caused by a variation in the index of refraction with wavelength. Different ...

These explain quite comprehensively a wide range of aspects, not only physical principles of operation, but also various practical issues.

At ReplaceALens, we have narrowed the array of progressive lenses available on the market to the best designs that excel in terms of function, durability, and affordability. Through 20 years of customer, laboratory, optician, and optometrist feedback and endless testing, the progressive lens offerings from ReplaceALens are designed to exceed your expectations. When selecting your lens material, you have several choices. The most important element in selecting the right lens material for your prescription is the thickness and weight of the lenses. These elements are affected by your prescription strength, the type of frames you choose (or already have), frame size, and your pupil location. Consult our user-friendly chart to find our recommendations for how to select the lens material that’s best for you based on those considerations.

The IR filters work by blocking light up to certain wavelengths and only passing light higher on the spectrum into infrared. The result is otherworldly ...

For photography of small objects over short distances with a substantial magnification (macro photography), the image brightness is substantially lower than one might expect from the f-number. It depends on the working f-number, which is larger (see above).

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Digital (HD) progressives are fully customized to your specific application using your prescription strength, frame type, lens material, and intended use to formulate a lens with wider fields of view and smoother vision. Traditional progressive lenses are still a great, functional choice, but for those who want the widest fields of view, the new Digital Progressive lenses are an improvement. HD progressive lenses feature custom lens designs allowing for the best possible peripheral vision, wide corridors, and smooth visual fields. Digital progressive lenses correct for every focal length including distance, intermediate, and reading.

The primary function of a microscope is to study biological specimens. A microscope solely functions on two concepts – magnification and resolution.

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Normally, the f-number of a photographic objective can be changed in certain steps, with typical values like 2, 2.8, 4, 5.6, 8, 11, 16 and 22, progressing roughly such that each step (“going up one stop”) reduces the aperture area by a factor of 2, which has two consequences:

Eyeglass Lens Replacement > Order Eyeglass Lenses > Progressive Eyeglass Lens Replacement > Digital (HD) Progressive Lenses

Some objectives offer only relatively large f-number values because image aberrations could not be properly compensated for lower values. Unfortunately, that limits their light gathering power, which for distant objects is determined by the f-number. Particularly for close objects, the light gathering power can be reduced substantially. That aspect is relevant for macro photography, where exposure times have to be increased accordingly.

What type of eyeglass lenses you choose is as important to your viewing comfort as the design of the frames are when it comes to your overall wearing comfort. At ReplaceALens, you can be certain your glasses are constructed from the best materials available, as all of our lenses are sourced from name brand manufacturers. If you have any further questions about our digital progressive lenses or need help in placing an order with us, please give us a call today at (800) 752-5572, email us at [email protected], send us a message using our online contact form, or stop by and visit us at 7800 East Iliff Avenue, Unit 1 in Denver, CO 80231.

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When imaging an object which is not at infinity, the output ray angles are smaller. One can define the working f-number based on that for given imaging conditions; it is correspondingly larger than the f-number.

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Optics began with the development of lenses by the ancient Egyptians and Mesopotamians, followed by theories on light and vision developed by ancient Greek ...

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Generally, the term lens speed is often used in the context of photographic objectives. Lenses with low f-number, which therefore allow for relatively short exposure times, are often called fast lenses, while those with high f-number are slow. The lens speed usually refers to the minimum possible f-number of an objective.

Most photographic objectives contain a diaphragm (an optical aperture) of variable diameter. It is common not to directly specify the used aperture diameter, but instead the f-number. This is defined as the ratio of focal length and the diameter of the entrance pupil. Specifications are often done in the format f/N, where N is the f-number. For example, f/5.6 means that the entrance pupil diameter is the focal length divided by 5.6. The notation f/# is also common.

Metric Hex Bolt Dimensions. Technical Menu Posted on July 2nd, 2015 by vapro. * All measurements in millimeters *. NOMINAL SIZE (D), BODY DIAMETER, HEAD ...

Three common uses for infrared waves are the following: Thermal imaging cameras for night-vision and security cameras. Remote controls use infrared sensors to ...

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industrial camerauEye CP GigE ... ... pre-processing and, thanks to the internal 120 MB image memory, is also perfectly suited for multi-camera systems. The ...

Also referred to as no-line bifocals and no-line trifocals, progressive eyeglass lenses look like single vision lenses, with a corridor of increasing power as you travel down the lens. When wearing standard progressive lenses, the peripheral vision can be somewhat compromised due to the construction of the lenses. Digital (High-Definition) lenses, also known as "free-form design," or “HD Lenses,” have recently seen an improvement in the technology behind their construction that has taken progressive lenses to a new level, producing lenses with a wider, lower-distortion viewing are. Traditional progressives are produced using pre-molded designs, meaning that the same design is used for every application.

Olympus SZX10 Stereomicroscope · Capabilities: · Cost: · Specifications: Microscope: Olympus SZX10. Light Source: LED Transmitted light source.