Canon EF or EF-S mount — you need one set of extension tubes and here are details of configuration. With the following configuration, the variable extension needs to extend out about 4 mm.

It is rather difficult to place the Raynox add-on lenses EXACTLY by physically measuring the distance because of lack of precise parts available. However, it is rather easy to configure it optically — mounting it onto the camera and try to focus it to infinity. So the best way is to pick something very far away with a lot of texture, adjust the placement of Raynox lens until you get a sharp focus. Here is an example.

The above picture shows an example of setting it up for Canon EOS camera, for other cameras, simply use standard dumb extension tube for the camera. Since I have shown you how to put an infinite microscope objective on a standard extension tube (without electrical contacts), now it is important to determine how long the extension tube should be for different cameras.

- one 28-mm segments,- one 14-mm setments,- one MJKZZ-VLE,- one Nikon-M42,- one male lens mount and- one female lens mount.

The surface tarnish replaced the interface between air and glass with two new, air-tarnish and tarnish-glass interfaces. Due to the tarnish having a refractive index between glass and air, these two interfaces each exhibited less reflection than a clean air-glass interface. The total of these two interfaces’ reflections is, in fact, less than the reflection of a ‘naked’ interface between air and glass, which can be calculated via the Fresnel Equations.

Continually developing new coatings – many of which are designed specifically to meet client-specific requirements – Diamond Coatings uses state-of-the-art technology to vacuum deposit these coatings onto virtually any flat or shaped substrate, including injection-moulded parts. Learn more/discuss your AR coating requirements today by contacting our helpful, innovative team of experts now.

With focal length of 125 mm, the DCR-250 needs to be placed at 125 mm away from camera sensor (not from lens mount). Here are some example:

The first, and simplest, type of AR coating was discovered in 1886 by British Physicist and Nobel Prize Winner (physics, 1904) John William Strutt, 3rd Baron Rayleigh (Lord Rayleigh). Upon testing some old, tarnished glass pieces (chemical reactions between the environment and the optical glass of his time tended to cause surface tarnishing on glass as it aged), Lord Raleigh found that – to his surprise – these tarnished pieces transmitted more light than clean, new pieces.

anti-reflective coating是什么

Let’s take a closer look at electrically conductive plastics and explore how we utilise Indium Tin Oxide (ITO) coating technology to unlock their potential.

Same principle as with Raynox DCR-150, it must be placed at EXACTLY its focal length away from camera sensor which is 125 mm away. Since different camera has different flange distance, so extension tube length is dependent on camera type. Here is a table:

Ar coating

We know that an infinity corrected objective needs another optical piece, called tube lens, to project an image onto a surface, in our case image senor of our DSLR camera. Raynox close up lenses can do just that, projecting light rays onto camera sensor when positioned correctly and it has been proven the results are excellent, even for high end expensive APO objectives. Cool, right!

Mounting an objective on to a Canon EOS camera, for Nikon camera, standard dumb extension tube for Nikon camera can be used instead of the one for Canon

Anti-fingerprint coatings create a barrier against everyday marks, ensuring that your devices, and other surfaces, remain pristine and clear.

A list for the flange distance for nearly every camera model can be found on wikipedia: https://en.wikipedia.org/wiki/Flange_focal_distance

At Diamond Coatings, we take pride in being a leading TCO films supplier, specialising in the deposition of high-quality ITO.

For example, if a 10X objective requires 180mm focal length for tube lens (most Olympus RMS objectives), if it is mounted on to Raynox DCR-250 as tube lens, its real magnification is 10*125/180 = 6.94x

In 1904, a chemical method of producing AR coatings was developed by British inventor/optical designer Harold Dennis Taylor (Cooke Company), followed by the invention and development of:

- three 28-mm segments,- three 14-mm segments,- one MJKZZ-VLE,- one EOS-M42,- one male lens mount and- one female lens mount.

The Raynox 150 has a focal length of 208.33 mm. What his means is that we need to place it EXACTLY 208.33 mm away from the sensor. For Canon EOS camera with EF mount or EF-S mount, the registered distance is 44 mm (distance from the mount to the sensor plane), this means the total extension tube should be 208.33 – 44 = 164.33 mm in length. For Nikon camera, the registered distance is 46.5 mm, the extension tube length should be 208.33 – 46.5 = 161.83 mm. The same goes with other type of camera mounts.

With long focal length of 208.33mm, the DCR-150 needs long extension length for most camera mounts. Here are some example:

At Diamond Coatings, we’re passionate about pushing the boundaries of touch technology. We’re not just manufacturers – we’re innovators

One thing about standard extension tubes without electrical contacts is that they seem all come with three segments of 7 mm, 14 mm and 28 mm long and a 10 mm long female lens mount segment and 5-7 mm male lens mount segment. These segments can be screwed together to form longer length and this is very convenient.

Canon EF or EF-S mount — you need three sets of extension tubes and here are details of configuration. With the following configuration, the variable extension needs to extend out just a little bit.

Consisting of thin transparent film structures, many AR coatings have layers of alternating contrasting refractive indexes. The thickness of layers is selected to generate destructive interference within beams reflected from interfaces, as well as constructive interference within corresponding transmitted beams. Making the structure’s performance alter with incident angles and wavelengths, this frequently causes colour effects to appear at oblique angles.

Surface coating

Many people started out macro photography with close up add-on lenses, some are cheap and some are not so cheap. One set of well known and widely used add-on lenses are Raynox DC-150 and DC-250. These close up add-on lenses are very convenient to use, simply screw/clip it onto a (usually) telephoto (zoom) lens. The results can be stunning as evidenced by many beautiful images shot with them.

- three 28-mm segments,- three 14-mm segments,- three 7-mm segments,- one MJKZZ-VLE,- one EOS-M42,- one male lens mount and- one female lens mount.

Canon EF-M mount — you need two sets of extension tubes and here are details of configuration. With the following configuration, the variable extension needs to extend out about 2 mm.

- two 28-mm segments,- one 14-mm segments,- one MJKZZ-VLE,- one EOS-M42,- one male lens mount and- one female lens mount.

This is shot with Raynox DCR-150 focused onto a building pretty far away. Note, the actual image quality is very hazy, this image was dehazed in Adobe Lightroom. You can see a lot of details — meaning the DCR-150 is at right place from the sensor.

anti-glare什么意思

As the name suggests, anti reflective (AR) coatings are optical coatings applied to the surfaces of optical elements, lenses, etc. to reduce reflection. Improving the efficiency of typical imaging systems (reduced reflections means reduced loss of light), AR coatings also improve complex systems’ (microscopes, telescopes, etc.) contrast of images by eliminating stray light, which is particularly important for planetary astronomy.

Elimination of reflection is itself the primary benefit for many applications, including, for instance, coatings to reduce the glint from telescopic sights or the binoculars of covert viewers, and coatings on the lenses of eyeglasses.

Because Raynox add-on lenses are not designed for photographing alone, most of the time the image will be hazy, so it is better to use the digital zoom feature of your camera to help determining focus. It is also better to do this at night and aim at lights far away.

Optical coating

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Optical coating process

Of particular benefit is the large size of the parts that Diamond Coatings can apply AR coatings to. We can anti-reflect parts up to 1m x 1m, which is much larger than typical for the coating industry.

Canon EF-M mount — you need three sets of extension tubes and here are details of configuration. With the following configuration, the variable extension needs to extend out about 8 mm.

To summarize, the key point of using Raynox (or any other dioptor lens) as tube lens is to place it at right distance from camera sensor (not lens mount) using either bellow, extension tubes with variable extension, or any other means. And to determine the right distance is to focus the setup to infinity and obtain a sharp image. Different camera has different flange distance (distance from the sensor to lens mount), so it is not possible to have one set of extension for all cameras, variable extension is highly recommended.

Although it is necessary to specify wavelength ranges when designing/ordering anti reflective coatings, good performances can frequently be achieved for comparatively wide frequency ranges. Choices offered usually include IR (infra-red), visible and UV (ultra-violet). The question is, where did it all begin?

Both Raynox 150 and Raynox 250 have 49 mm female filter thread in front of it and 43 mm male thread at the end. In this blog, I am trying to find a generic solution so that this approach can be used for other type of cameras. I have mentioned that I personally like to use standard “dumb” extension tubes. These are without any electrical contacts for the type of camera we have and convert the extension tube to end with M42. So here is one way of assembling it together with a M42 male thread at the end.

- three 28-mm segments,- two 14-mm setments,- one 7-mm segments,- one MJKZZ-VLE,- one Nikon-M42,- one male lens mount and- one female lens mount.

Obviously, it is very hard to find an extension tube with such exact length, therefore, it is important to have a variable length extension tube. There is ONE important components in above picture: the MJKZZ VLE.

This component allows you to adjust total length of extension so that the Raynox is placed at right position to be used as tube lens — by changing how far the inner ring extends. This components allows you to vary total length between 20 mm to 30 mm, so there should be enough room for different camera mount and Raynox. Of course, it is highly recommended to keep this variable length as short as possible.

Nikon F mount — you need three sets of extension tubes and here are details of configuration. With the following configuration, the variable extension needs to extend out about 7 mm.

Nikon F mount — you need one set of extension tubes and here are details of configuration. With the following configuration, the variable extension needs to extend out about 1 mm.

antireflective coating中文

Before going into the history of AR coatings, allow us to begin by looking at what exactly an anti reflective coating is…

Even though Raynox DCR-250 has shorter focal length than most infinite objectives requires, it is often used as tube lens but with reduced magnification than designed for the infinite objective. The actual magnification is calculated as following:

Development of AR coatings continued over the coming decades and in 2002, Diamond Coatings established its first ITO and AR Coating manufacturing plant in the Midlands, UK. Operations were expanded to Arizona, USA in 2016 and today, Diamond Coatings is a leading supplier of AR & ITO coatings to world-wide industries including:

So theoretically the purpose of tube lens is to focus light beams coming out of microscope objectives onto our DSLR sensor, therefore, it is necessary to position the Raynox (as tube lens) at right position so that its focal plane coincides with the sensor plane. To do this, the Raynox must be placed at its focal length distance from the sensor. For Raynox DCR-150, the focal length is approximately 208.33mm and it should be placed at 208.33mm away from the sensor. Similarly, for Raynox 250, the focal length is 125mm, therefore it must be placed at 125mm away from the sensor plane.

The required tube lens focal length varies from different microscope objective manufacturers. Typically microscope objectives from same manufacturer usually require the same tube lens focal length. If you purchase a generic microscope objective, it is best practices to ask your vendor where you purchase it from. Here are some typical tube lens focal length from different manufacturer:

- one 28-mm segments,- one 14-mm segments,- one MJKZZ-VLE,- one EOS-M42,- one male lens mount and- one female lens mount.