#Varifocal Lenses

[reglazemyspex]

Essilor x Design

Varilux X Design varifocal lenses are the most advanced progressive lenses available in the market today and are for customers who want the latest technologies.

[karingottschalk]

Leitz Auction: Leica Vario-Elmar-M 3.5-5.6/28-75mm Aspheric Prototype – Commentary

[needlesandnilbogs]

Everything I learn about American healthcare makes it worse lmao - insurance only covers the lenses? You're meant to what, hold them up to your eyes in your fuckin hands?

(Here, at least at the big chain opticians, we have to pay for our frames (though there may be exceptions if you're on certain benefits, can't remember); the lens is packaged in with that unless you want special treatment for them that makes them clearer/less flare-prone etc, or you have varifocals. There are usually like two frame options that are very cheap, £15 or so, and a couple more under £50, but if you're up for spending £70 you get 2 for 1. So I do that. Because I have a delicate baby head that can't deal with wearing the same pair of glasses for more than four hours or so. Also my mum always gets two and I've seen her be glad of it often enough to want to follow suit.)

this is about the glasses poll? I have really bad glasses insurance and my whole family has terrible eyes (I’m at -8 diopters, mom’s -4 and has the best eyes, dad’s at -10 or more, 2’s at -8 also, 3’s only ten and is at -4.5 or something), I know some people have better options because we’re on the absolute cheapest eye insurance from dad’s work. We get a $200 frame allowance or something every two years and a new pair of lenses every year, but have to pay for antiglare or blue screen light stuff or transition sunglasses lenses or whatever

it would be cheaper and more possible to get frames from Costco or something, but we all just have terrible eyes that nobody will make our lenses except the optometrist office so we need to get stuff through there.

[jess-the-reckless]

Brain is finally on board with my new varifocal lenses, and I am so happy to be back on my bullshit. My eyes got significantly worse during Covid, perhaps due to my habit of cross-stitching like a maniac throughout lockdowns. This one has been on the frame for a while, a six panel world map done in an olde worlde 'here be monsters' style. Coarser aida than I've worked with before, but I'm hoping to smooth some of the blockiness with overstitching when it's done. There's a lot of backstitching that's going to go into this one.

...and I can't help thinking these borders would look good with a gold thread running around the inner edges. Have a lot of metallic threads lying around spare, and while they're a swine to work with they do look so, so pretty.

[soniabigcheese]

Well ... eyes and feet test today

Wish me luck, although they shouldn't find anything untoward just yet. I look after my feet and eyes

I just hope that the weather remains murky and overcast as I don't have my sunglasses with me - not that they'll help any,I can't see out if them. Because they're just that. Sunglasses with no special varifocal lenses.

[cursedvibes]

Your comment about Sukuna's eyes not likely being fully functional was both enlightening and also reminded me how my own eyes each have a very distinct prescription from the other. So now I'm visualizing Sukuna wearing prescription glasses and having his mind blown because he can now see everything in HD from all directions and also his head is not in constant pain. Image each eye having a distinct prescription with one nearsighted and the set farsighted.

He gets an invasive eye surgery from Kenjaku and Tengen and is definitely not happy being their test subject again, but holy shit he can actually see now and doesn't just have to rely on his senses!

Honestly, I wonder how custom-made glasses for him would even look. For the left side you're probably good with just bigger regular glasses/monocle, maybe varifocals if there's a big difference between the big and the smaller eye, but the ones on his right side would need a custom made contraption. Maybe something you tie on like an eyepatch.

The mindfuck over getting glasses for the first time is relatable though. My eyesight isn't even that bad, but that's exactly why I thought for the longest time I don't need them. I can't read signs on the other side of the street, but pssh that's normal, nothing bad. Then we went to an optician for new glasses for my father and the assistant there was like "no, you'd definitely benefit from having glasses". He gave me his glasses because they were close to my strength and I lost my mind when I realised how far regular people can see. Had completely forgotten that used to be normal for me too. Still don't wear glasses or contact lenses most of the time unless I'm travelling...because I'm too lazy

[pers-books]

Had an eye test a couple of weeks ago and found I need some new glasses, even though I only had new ones last year. £261 for new varifocals with photochromatic lenses and a 'free' (not really 'cos I have to pay £60 extra for 'em) pair of prescription sunglasses which I really need 'cos the photochromatic lenses aren't cutting it when we do get sunshine at this time of year.

I went in to make a partial payment on them (since I can't afford to take £261 out of my £1060 Universal Credit payment along with my £700 rent and also bills and food) and got told if I didn't make the full payment by July 31 I'd have to pay the other £70 that they gave me off the price via an NHS voucher.

So there went my plan to pay it off over 3 months (I get my UC payments on the 5th of the month)! And now I guess I'll be eating a lot of toast and drinking a lot of water and not much else for the rest of June and all of July.

Anyway, the Tories are fucking cheapskates who are only in politics so they can line their own pockets. They're saying they'll cut off people's UC if they're out of work for more than a year, regardless of the reasons why AND they want to cut the disability benefit, too, if they get back in, so please, PLEASE, fucking vote them out on July 4th!

[nooneelsecomesclose17]

£236 just to be able to see properly.

Thank goodness I only get varifocal lenses in one side!!

[biffybobs]

hi excuse me i have a very important werewolf question!! does Wolfgang wear a glasses chain so he doesn’t lose his prescription lenses when he transforms? 🤓

Well of course, those varifocal lenses aren’t cheap you know. And he can’t use contacts with those claws 😬

[bubbleeyecareuk]

Easy and Accurate At-Home Eye Tests in Lancaster

We carry out thorough Eye Test at Home Lancaster, using the latest portable optical equipment. We will look for eye health conditions like glaucoma, macular degeneration, and cataracts. An optician can also detect underlying health conditions such as Diabetes and High blood pressure. You will be given as much time necessary, so we can give you the best possible care and advice.We will bring a variety of spectacles, from full rimmed to rimless, so everyone can find the perfect pair. We offer single vision lenses, bifocals, and different varifocal designs to suit your requirements.We personally hand deliver glasses and adjust them to fit correctly, ensuring you have the clearest vision possible.

[reglazemyspex]

What are Varifocal Lenses?

Varifocal lenses are a multifocal lens, also sometimes called progressives, Varis, or Multi-Focals. They contain a progression of focal power to help you see at different distances.

[seccamsla]

📷💡 From Fish-Eye to Floodlight | Choosing the Right Security Camera Lens for Your Needs 💡📷

When it comes to selecting the perfect security camera, it's not just about the features – it's also about the lens. At Digital Surveillance CCTV Installer, we understand that choosing the right lens can make all the difference in capturing clear, detailed footage of your property. Here's a breakdown of the different lens types and their ideal usage scenarios:

Wide-Angle Lens: 🌐

Ideal for capturing a broad field of view, wide-angle lenses are perfect for monitoring large areas such as parking lots, warehouses, or outdoor spaces. With a wide-angle lens, you can keep an eye on expansive areas with just a single camera, minimizing blind spots and maximizing coverage.

Varifocal Lens: 🔄

Offering versatility and flexibility, varifocal lenses allow you to adjust the focal length manually to zoom in or out on specific areas of interest. Whether you need to focus on a distant object or capture detailed footage of a specific area, varifocal lenses give you the freedom to customize your surveillance needs on the fly.

Zoom Lens: 🔍

For capturing fine details from a distance, zoom lenses are the go-to choice. Whether you're monitoring a cash register, license plates, or facial features, zoom lenses allow you to zoom in and capture clear, crisp footage with precision and accuracy, even from afar.

At Digital Surveillance CCTV Installer, we offer a wide range of security cameras with different lens options to suit your specific needs. Whether you need wide-angle coverage for expansive areas or zoom capabilities for detailed surveillance, we've got you covered.

Ready to find the perfect lens for your security camera? Contact Digital Surveillance CCTV Installer today to learn more about our camera options and take your surveillance game to the next level. Let's focus on your security needs, one lens at a time. 🎥🔎

[speclens]

Seeing Clearly with Transformative Lens Replacement for Old Frames

SPecLens UK invites you to experience visual clarity and convenience with our range of Varifocal Glasses Lenses and the innovative option to get new lenses in your existing frames. We understand that your eyewear is a personal statement, and our commitment to optical excellence ensures that you not only see well but look great too.

Our Varifocal Glasses Lenses are designed to cater to the dynamic needs of individuals requiring both near and distance vision correction. Say goodbye to the inconvenience of switching between multiple pairs of glasses. SPecLens UK's varifocal lenses seamlessly blend prescriptions, providing a smooth transition between focal points, allowing you to enjoy clear vision at any distance without sacrificing style.

For those who have a favorite pair of frames but need updated lenses, SPecLens UK offers the perfect solution. Our lens replacement service allows you to keep the frames you love while enjoying the benefits of new and improved lenses. Whether you need a new prescription, different coatings, or simply want to refresh your eyewear, SPecLens UK ensures a hassle-free and cost-effective lens replacement process.

Experience the clarity of vision and the flexibility to update your eyewear effortlessly with SPecLens UK. From Varifocal Glasses Lenses to giving new life to old frames, our commitment to quality optics and customer satisfaction is at the heart of our optical services. See clearly and stylishly with SPecLens UK.

[superiorcctv]

Unveiling the Vision: A Closer Look at CCTV Lens Manufacturers in China

In the ever-evolving landscape of security technology, the eyes and lenses behind surveillance cameras play a pivotal role in ensuring safety and monitoring. In this blog, we unravel the intricate craftsmanship and cutting-edge technology that contribute to the efficiency of security camera systems.

Understanding the Importance of Quality CCTV Lenses

Security camera lenses are the some of the main tools of surveillance systems. They determine the clarity, depth, and precision of the images captured, making them an integral component of any security setup. As we look to explore, CCTV lens manufacturers in China have been at the forefront of this industry, producing lenses that meet the highest standards of quality and reliability.

The Rise of CCTV Lens Manufacturers in China

China has emerged as a global hub for manufacturing high-quality security camera lenses. The country's technological prowess and manufacturing capabilities have positioned it as a leader in the security industry. Leveraging on advanced optics technology, production of lenses that cater to diverse surveillance needs has increased, starting from basic monitoring to high-end security applications.

Technological Advancements in CCTV Lenses

The rapid evolution of surveillance technology has led to significant advancements in CCTV lenses. From traditional fixed lenses to more sophisticated varifocal and motorized zoom lenses, manufacturers pushing the boundaries of innovations. These lenses are designed to capture high-resolution images, adapt to varying lighting conditions, and provide optimal performance in challenging environments.

Quality Control and Certification

Maintaining stringent quality control measures is crucial in the manufacturing of CCTV lenses. Reputable manufacturers in China adhere to international standards and certifications to ensure their products meet the highest benchmarks for performance and durability. This commitment to quality reassures customers that they can rely on these lenses for critical security applications.

The commitment to innovation, quality, and technological excellence positions manufacturing at the forefront of surveillance technology. As security needs continue to evolve, the manufacturers will undoubtedly play a crucial role in shaping the future of surveillance systems around the world.

[menzelrobovision-blog]

Choosing the Right Machine Vision Lens: A Comprehensive Guide

Machine vision technology has rapidly evolved, and selecting the appropriate lens for your application is now more critical than ever. With the wide variety of lenses available, choosing the right one can be a daunting task. However, by considering a few key factors, you can make an informed decision that will significantly impact the performance and image quality of your machine vision system. In this comprehensive guide, we will delve into the various aspects of selecting the perfect machine vision lens to meet your specific needs.

Fixed, Varifocal, or Zoom:

The first decision to make when choosing a machine vision lens is whether you need a fixed, varifocal, or zoom lens. Each of these options has its own set of advantages and is suited for different applications.

Fixed Lenses: Fixed lenses are an excellent choice when you have a consistent working distance and require sharp, high-quality images. These lenses have a fixed focal length, meaning they do not offer the flexibility to adjust the zoom or focus. If your application involves stationary objects or a controlled environment where the working distance remains constant, a fixed lens is a cost-effective and reliable choice.

Varifocal Lenses: Varifocal lenses are designed for situations where the subject is in motion or may require frequent refocusing. These lenses offer the flexibility to adjust the focal length and focus, making them ideal for applications that involve objects at varying distances. Varifocal lenses can save time and effort by allowing you to adapt to changing conditions without replacing the lens.

Zoom Lenses: Zoom lenses are the most versatile of the three options. They can adapt to distant subjects by changing the focal length, providing you with the ability to zoom in or out as needed. This adaptability is particularly valuable in applications where the working distance is not constant, or when you need to capture fine details in both nearby and faraway subjects. While zoom lenses offer flexibility, they are typically larger and more complex, which can result in a higher cost.

Focal Length and Focus:

The focal length of a machine vision lens plays a crucial role in determining the field of view (FOV) and the magnification of the image. Understanding how to choose the right focal length is essential for capturing the desired image.

Field of View (FOV): The focal length directly affects the FOV. A longer focal length will provide a narrower FOV, which means the lens will capture a smaller area with greater detail. Conversely, a shorter focal length lens will result in a broader FOV, allowing you to capture a larger area but with less magnification. When selecting the focal length, consider the size of the objects or areas you need to capture in your application.

Magnification: In addition to FOV, the focal length also determines the magnification of the image. Longer focal lengths result in greater magnification, making them suitable for applications where fine details are essential. Shorter focal lengths, on the other hand, provide lower magnification but are ideal for applications where capturing a larger area is a priority.

To choose the right focal length for your machine vision lens, you need to have a clear understanding of your application's requirements and objectives. Analyze the size and details of the objects you are inspecting to determine the optimal focal length for your specific case.

Aperture and Lighting:

The relationship between aperture and lighting is critical for achieving the desired depth of field and image quality in machine vision applications.

Aperture: The aperture of a lens controls the amount of light that enters the camera sensor. It is typically represented by an f-number (e.g., f/2.8). A smaller f-number indicates a wider aperture, allowing more light to enter, while a larger f-number means a narrower aperture, which restricts the amount of light. Selecting the right aperture is essential to achieve the desired depth of field.

Depth of Field (DOF): The depth of field is the range within which objects appear acceptably sharp in an image. It is influenced by the aperture size, with wider apertures producing a shallower DOF and narrower apertures providing a deeper DOF. The choice of aperture depends on your application's requirements. If you need to capture fine details in a specific focal plane, a narrow aperture might be suitable. For situations where multiple objects at varying distances must be in focus, a wider aperture may be preferable.

Consider the lighting conditions of your environment, the specific requirements of your application, and the depth of field you need to achieve when selecting the aperture for your machine vision lens.

Resolution and Accuracy:

When it comes to machine vision, resolution and accuracy are paramount. To ensure the best results, you must find a lens that offers the highest resolution for your subject or operation. Consider various factors, including image clarity, application demands, available options, and cost-benefit analysis.

Resolution: Resolution refers to the lens's ability to capture fine details in an image. Higher resolution lenses produce sharper and more detailed images, which can be crucial for applications that require precision, such as quality control and measurements.

Application: The specific application of your machine vision system will dictate the level of resolution required. If you are inspecting small electronic components, you will need a lens with exceptional resolution to detect defects. On the other hand, if your application involves monitoring large industrial processes, a lower resolution lens may suffice.

Cost-Benefit Analysis: While higher resolution lenses offer superior image quality, they can be more expensive. Therefore, it's essential to perform a cost-benefit analysis to determine the optimal balance between resolution and cost for your application.

By carefully considering these factors, you can select a machine vision lens that provides the resolution and accuracy required for your specific needs.

Working Distance:

Selecting the correct working distance is crucial when choosing a machine vision lens. Designers calculate the needed working distance using various factors, including focal length, the length of the inspected object, sensor size, and the size of the objects being observed.

Focal Length and Working Distance: The focal length of the lens plays a significant role in determining the working distance. A longer focal length results in a greater working distance, while a shorter focal length is associated with a shorter working distance. To ensure that the lens can effectively capture the desired field of view, it is essential to match the focal length to the working distance required for your application.

Object Size: Another factor to consider is the size of the objects you are inspecting. If your application involves large objects, you may need a lens with a longer working distance to maintain a suitable field of view.

By carefully calculating the working distance based on the focal length, object size, and other parameters, you can ensure that the lens you choose is perfectly suited to your application's requirements.

Sensor Compatibility:

Different sensors require different lenses, and it's crucial to select a lens that is compatible with your camera's sensor type and size. Sensor compatibility directly affects the image quality and the lens's ability to cover the desired field of view.

Sensor Size: The size of the camera sensor influences the field of view. Smaller pixel sensors require higher resolution lenses to achieve better image quality, as they capture more detail in a smaller area. In contrast, larger sensors require larger lenses to cover the same field of view.

Sensor Type: The type of sensor, whether it's a CCD or CMOS sensor, also plays a role in sensor compatibility. Different sensors have varying sensitivity to light and may require adjustments in the lens to optimize image quality.

When selecting a machine vision lens, consider the sensor size and type of your camera to ensure that the lens can effectively cover the desired field of view and produce high-quality images. Matching the lens to the sensor is essential for achieving the best results in your machine vision application.

Camera, Mount, and Location:

Compatibility with your camera and its physical location is another critical aspect of choosing the right machine vision lens. Ensuring that the lens aligns with the camera's sensor type and mount is essential for seamless integration.

Camera Sensor Type: Confirm that the lens is compatible with the sensor type of your camera, whether it's a CCD or CMOS sensor. Mismatched sensors and lenses can result in reduced image quality and potential compatibility issues.

Lens Mount: Different cameras use various lens mounts, such as C-mount or CS-mount. Ensure that your lens choice matches the camera's lens mount to facilitate easy installation. An incompatible mount can lead to alignment problems and may require additional adapters or adjustments.

Camera Location: Consider the physical location of the camera in your machine vision system. If the camera is difficult to access, you may want to opt for a lens with remote focus, iris, and zoom control capabilities. For instance, the LensConnect Series offers power and control through USB, allowing you to remotely adjust focus, zoom (in the case of varifocal lenses), and iris. This feature can simplify camera setup and maintenance, particularly in industrial or hard-to-reach environments.

Choosing a lens that seamlessly integrates with your camera and its location is essential for ensuring the optimal performance of your machine vision system.

Conclusion:

Selecting the right machine vision lens is a crucial decision that directly impacts the performance and image quality of your vision system. Before making your choice, consider the following key factors:

Fixed, Varifocal, or Zoom: Determine whether your application requires a fixed, varifocal, or zoom lens based on the working distance and subject characteristics.

Focal Length and Focus: Choose the focal length that aligns with your field of view and magnification requirements.

Aperture and Lighting: Select the appropriate aperture to achieve the desired depth of field and image quality based on your lighting conditions.

Resolution and Accuracy: Consider the application's demands and perform a cost-benefit analysis to determine the required resolution for your lens.

Working Distance: Calculate the working distance based on focal length, object size, and other factors to ensure the lens effectively captures the desired field of view.

Sensor Compatibility: Match the lens to your camera's sensor type and size to optimize image quality.

Camera, Mount, and Location: Ensure compatibility between the lens and your camera's sensor type, lens mount, and the camera's physical location.

By thoroughly evaluating these factors and understanding your specific application's needs, you can make an informed decision and select the best machine vision lens to achieve exceptional results in your machine vision system . Information flows from the lens first, so choosing the right lens is a fundamental step in the success of your machine vision project. To Know More About Machine Vision Lens Visit:http://mvrpl.com/index.html