An easy example is when shooting architecture or landscapes. For those, you often might want to be able to fit quite a wide perspective, or large angle of view, in the frame.

The reason I’ve singled Canon out as a special case here is that Canon’s APS-C sensors are just a smidgeon smaller than most other APS-C sensors.

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The practical angle of view of a lens varies based on the camera’s sensor size, so I’ve included some of the most common sensor sizes.

We all know how powerful the sense of sight is - but when we think of body health, we often don’t think about what our eyes need.

You might not have thought much about how glasses are made, but the care, science, and sheer technical expertise that goes into them really matters.

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An AR coating on your lenses can ease eye strain by reducing reflections to make your vision clearer. If you spend hours in front of a computer screen or on devices such as phones or iPads - particularly at night before bed - you may wish to choose an AR coating that also filters blue light.

Knowing the angle of view gives you a baseline reference for how wide a perspective you can fit in the frame. In a practical sense, I find it useful for choosing which lens is right for the job.

A larger angle of view corresponds to a wider lens, meaning you can fit more perspective within the frame. Conversely, a smaller angle of view gives you a narrow perspective, as you might get with a telephoto lens.

November Impact *Bupa Foundation will donate $5 AUD from every pair of prescription glasses or sunglasses, or packet of contact lens sold, online or in-store, between 6 and 30 November 2024 (donation period). The donation amount will be capped at $50,000 AUD. Donation does not apply to accessory or non-prescription glasses or sunglasses sales. Excludes all ADF contract sales. Customers are not eligible to claim any tax deduction or benefit. Eligible items that were purchased and then refunded or returned during the donation period will not be included in the final count to determine donation dollar amount. The final donation amount, as determined by the number of eligible items sold at $5 AUD per unit will be donated to The Brien Holden Vision Institute Foundation (ABN 86 081 872 586) within 90 days of the donation period ending. Chloe Jones Collection^From 6 November 2024, ongoing and until sold out (donation period), Bupa Foundation will donate $25 from every sale of glasses (prescription only) or sunglasses (prescription or non-prescription) from the Chloe Jones limited-edition range (1000 units available) to The Brien Holden Vision Institute Foundation (ABN 86 081 872 586) while stocks last. Donation does not apply to accessory or non-prescription glasses sales. Excludes all ADF contract sales. Customers are not eligible to claim any tax deduction or benefit. Eligible items that were purchased and then refunded or returned during the donation period will not be included in the final count to determine donation dollar amount. The final donation amount, as determined by the number of eligible items sold and will be donated to The Brien Holden Vision Institute Foundation (ABN 86 081 872 586) within 90 days of the donation period ending. Value Range*Offer available in-store and online at Bupa Optical. First complete pair(frame and single vision stock lens package) must be purchased from any ‘ValuePackage’ range (Range) at the first pair price for that Range. Second pair must be purchased in the same transaction or within 30 days of collection of an eligible first pair (in-store only). Second pair must be from the same or lower Range at the second pair price for that Range. Lens type upgrades and lens addons available on either pair at an additional cost and can differ between each pair. The prescription in each pair may also differ if both are clinically required by the customer. Frame only, may be purchased at the same amount as the frame & single vision stock lenses package price. Offer not available to goods supplied pursuant to any agreement between Bupa and any commonwealth government or associated entity. Members discount: 25% off Designer and sunglassesOffer available in-store and online at Bupa Optical. Bupa health insurance members buy any frames or sunglasses from the Designer range and receive 25% off the RRP on your first pair. Offer not available to goods supplied pursuant to any agreement between Bupa and any commonwealth government or associated entity. Bupa Optical Pty Ltd ABN 24 126 819 154.Members discount: 25% off Designer and sunglasses lenses & add-onsOffer available in-store and online at Bupa Optical. Bupa health insurance members buy any pair of prescription glasses or prescription sunglasses and receive 25% off RRP any lenses (excluding the value range), lens type upgrades and lens add-ons. Offer not available to goods supplied pursuant to any agreement between Bupa and any commonwealth government or associated entity. Bupa Optical Pty Ltd ABN 24 126 819 154.50% off 2nd pair Designer and sunglassesOffer available in-store and online at Bupa Optical. Buy any pair of prescription glasses or prescription sunglasses from the Designer range and receive 50% off RRP of any second prescription pair from the Designer range of equal or lesser value. You will also receive 50% off RRP for any lens type upgrades (not including lens add-ons) on the second pair from the Designer range. Alternatively, if you wish to purchase your second pair from the ‘Value Package’ range, you will only pay the 'Value Package' second pair price with 50% off lens type upgrades (not include lens add ons). Lens add-ons are always at an additional cost. Second pair in this offer must either be purchased in the same transaction, or if you are purchasing in-store it can also be within 30 days of collection of an eligible first pair. Offer not available to goods supplied pursuant to any agreement between Bupa and any commonwealth government or associated entity. Bupa Optical Pty Ltd ABN 24 126 819 15450% off lenses 2nd pair Value RangeOffer available in-store and online at Bupa Optical. Buy two pairs of prescription glasses from the Value range, received 50% off RRP lens type upgrades (does not include lens add ons) on the second pair. Lens add-ons are always at an additional cost. Second pair in this offer must either be purchased in the same transaction, or if you are purchasing in-store it can also be within 30 days of collection of an eligible first pair. Offer not available to goods supplied pursuant to any agreement between Bupa and any commonwealth government or associated entity. Bupa Optical Pty Ltd ABN 24 126 819 154Members discount: 20% off Contact LensesOffer available in-store and online at Bupa Optical. Bupa health insurance members receive 20% off the RRP on contact lenses. Offer not available to goods supplied pursuant to any agreement between Bupa and any commonwealth government or associated entity. Offer available instore and online by entering your Bupa member number at checkout on the Bupa Optical website Bupa Optical Pty Ltd ABN 24 126 819 154.EyeInspect and Microvascular Health Assessment

Have you ever had trouble sleeping after a night spent looking at your phone, your computer, your television and your tablet? This could be due to exposure to blue light.

Yes – everyone can benefit from anti-reflective lenses, particularly if you find yourself looking at your devices for long hours or driving regularly at night.

AR lenses these days are treated so they repel water - and they also resist water spots forming, which means you’ll spend less time removing those pesky smears and fingerprints. Just ensure you use lens cleaning products suitable for coated lenses, so you don’t damage the surface.

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You might not have thought much about how glasses are made, but the care, science, and sheer technical expertise that goes into them really matters.

Here’s a calculator for the angles of view from lenses on digital camera sensors, as well as angle of view charts for common focal lengths. And I’ve also included an explanation of why the diagonal angle of view matters more than you might think.

If you proceed with EyeInspect or Microvasular Health Assessment (MHA) (retinal screenings), Bupa Optical Pty Ltd ABN 24 126 819 154 (Bupa, we, us or our) will collect your personal information (PI) (your age, patient ID, gender and retinal images) from you for the purpose of conducting the retinal screening and reporting to you. The findings in your report will be based upon your retinal screening, but will not constitute a clinical diagnosis, recommended treatment or medication, nor be a substitute for advice from your eye health professional or other health care practitioner. We will disclose your PI to the providers of the retinal screening tool we use, Eyetelligence Pty Ltd, for the purpose of conducting the retinal screening and generating the retinal screening report. If you do not provide all of the PI requested, we may not be able to conduct the retinal screening or provide you with your retinal screening report. Bupa handles your PI in accordance with its Privacy Policy found at https://bupaoptical.bupa.com.au/pages/privacy-policy. This Privacy Policy lets you know how to access and correct your PI, how to make a complaint if you believe we have not complied with the Australian Privacy Principles and how we will handle your complaint. You can also contact us at Bupa Optical Head Office – Level 15, 33 Exhibition Street, Melbourne VIC 3000, or via email at feedback@bupaoptical.com.auMicrovascular Health Assessment: Free for Bupa members ^This offer is available for Bupa Health Insurance members between the ages of 40 and 80 to use at Bupa Optical for a free Microvascular Health Assessment (valued at $25). Microvascular Health Assessments are suitable for people between the ages of 40 and 80. Offer must be applied in a single transaction and is available in-store only. The offer may be redeemed once per person and once per transaction. This offer is not transferable and not available in conjunction with any other offer or discount, except Bupa Health Insurance member discounts. Any Bupa Health Insurance member discounts (if applicable) will be applied prior to the discount amount of this offer. Offer not available to goods supplied pursuant to any agreement between Bupa and any Commonwealth government or associated entity. Bupa Optical Pty Ltd ABN 24 126 819 154.Hearing~Available to customers 18 years and older.^Offer available on hearing aids from a higher technology level than the Hearing Services Program (HSP) range (Eligible Products). For HSP customers, 25% discount will apply to the balance owing on Eligible Products once any applicable HSP funding is applied. Offer available for the duration of the Bupa and Amplifon partnership. This offer cannot be used in conjunction with any other offer.^^Discount available on any in-store hearing offer at Bupa Optical & Hearing or Amplifon stores for the duration of the Bupa and Amplifon partnership.

Yes, this angle-of-view calculator works for zoom and prime lenses. You can enter any single, specific focal length along the zoom range. For instance, for a 24-70mm zoom lens, you can enter 55mm to see the angle of view at that point in the zoom range.

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Contact lenses are popular for a reason - they make life much easier for many people with vision issues. However, they might not be the right option for everyone.

When you’re taking photos, the angles of view horizontally or laterally across the frame or vertically up and down the frame are probably the ones you’re most focused on. But it’s actually the diagonal measurement that comes up more often.

To place an order with anti-reflective lens coating, when entering your prescription details select ‘anti-reflective’ on the lens coating page.

You may experience a ‘halo’ effect around street lights or car headlights when driving at night. An AR coating can help this problem by virtually eliminating the reflections from your lenses.

When you see that a lens has so-and-so degrees angle of view, it’s actually telling you it’s from one corner to the diagonally opposite corner. It’s not telling you the angle of view from side to side.

Please bring to your appointment:1) Your Medicare Card and Health Insurance Card (if applicable)2) Your previous spectacles (if any)3) Your previous contacts (if any)

By having a reference point you can compare lenses in an apples-to-apples kind of way. That can be very handy when choosing the right lens for the job.

Important InformationWe encourage arriving 10 minutes prior to your appointment time to ensure we can understand all of your vision needs.

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For 35mm film, that’s going to be functionally the same as using the full-frame option in the calculator above. I haven’t added other film sizes, but I might try to put together a separate calculator for that.

That’s because it’s the spec that lens manufacturers include in their spec sheets. So when you see that a lens has so-and-so degrees angle of view, it’s actually telling you it’s from one corner to the diagonally opposite corner. It’s not telling you the angle of view from side to side. In that respect, it’s a bit like the size spec that TV manufacturers use (i.e., a 55-inch TV is 55 inches from one corner to the diagonal corner, not from one side to the other side).

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Have you ever had trouble sleeping after a night spent looking at your phone, your computer, your television and your tablet? This could be due to exposure to blue light.

It’s also a fixed reference point if you’re using the same or similar focal lengths but on different-sized sensors. For instance, a 20mm lens will give you a wider angle of view on a full-frame camera than on a Micro Four Thirds camera.

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The data here is calculated. For more specific data that applies to a particular model of lens, check the manufacturer’s spec sheets for that lens. Sometimes there might be, say, a half degree of variation, but in general, these rounded numbers should get you very close. I’ve compared them with a number of lens spec sheets and found the data here to be quite accurate.

This is for full-frame digital cameras with a sensor that measures 36mm x 24mm, which is the convention for a full-frame sensor. It also applies to SLR cameras using 35mm film.

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These charts offer an alternative way of visualizing the calculated data above. It might be useful if you’re approaching it from the other direction and trying to find a lens that has a particular visual coverage that you’re after.

An AR coating will help to prevent sunlight from reflecting into your eyes when the sun is behind you. This can help if you tend to experience those annoying reflections or ‘ghost’ images when wearing sunglasses.

The same general principles apply for film, but instead of using the size of the sensor you’d use the size of the exposed film plane.

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Anti-reflective lenses have a coating (sometimes referred to as an AR coating, multicoat or anti-glare coating) which reduces the amount of light that reflects off your lenses. Essentially, it allows more light to pass through your lenses to your eye, giving you clearer vision.

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When you first have an eye test, your optometrist will get the lowdown on your eyes, vision, health and lifestyle in order to tailor the test to you.

Olympus and Panasonic Lumix are the most prominent manufacturers using this sensor format. In practice, there can be very slight variations in the dimensions of the sensors from model to model.