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Posts Tagged ‘400mm’

Canon patents 400mm F5.6 catadioptric ‘mirror’ lens

16 Dec
This diagram of the light path through Canon’s newly-patented 400mm catadioptric lens shows how the mirrors help to ‘fold’ the light path and decrease the size of the lens.

A new Canon lens patent out of Japan has been raising eyebrows around the photo community this week. The patent describes a 400mm F5.6 lens, which wouldn’t necessarily be newsworthy… except that it’s a catadioptric lens (also known as a ‘mirror’ or ‘reflex’ lens).

Catadioptric lenses went ‘out of style’ so-to-speak many years ago, but for a time they offered economical and compact alternatives to standard long telephoto lenses. The optical design of these lenses use mirrors to both ‘fold’ the optical path and magnify the image coming in, allowing for a far more compact design.

Take, for example, this Vivitar Series 1 600mm F8 catadioptric lens:

Vivitar Series 1 600mm f/8 Solid Catadioptric Lens | Photo by pointnshoot (CC BY-SA 2.0)

Other advantages of a catadioptric lens design includes very nearly eliminating chromatic aberration and off-axis aberration; but, of course, this kind of lens design doesn’t come without its drawbacks.

There are two main issues, both of them caused by the central mirrors causing an obstruction in the middle of the lens.

The first of these is that you can’t use a standard diaphragm aperture system, a problem this Canon patent seems to ‘solve’ by using a variable density ‘electrochromic’ filter to ‘stop down’ the lens—although this will obviously not have any impact on depth of field.

The second problem is the donut-shaped bokeh produced by catadioptric lenses:

Donut Bokeh Example | Photo by Hustvedt (CC BY-SA 2.0)

In the end, it seems manufacturers (or consumers) decided that the drawbacks of catadioptric lenses were not worth the ultra-compact design. But as more and more photographers seek to lighten their kit, maybe Canon sees an opportunity to bring the ‘mirror lens’ back into public consciousness.

Articles: Digital Photography Review (dpreview.com)

 
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Sony patents 400mm F2.8 lens for a curved medium format sensor

21 Jul

It’s a great day for innovative patent news. Earlier today, we told you about a Nikon patent for a lens that was designed to work with a full-frame curved sensor camera. But that might not be the most innovative curved sensor patent you’ll hear about today. That title goes to Sony, and their 400mm F2.8 lens designed for a curved medium format sensor.

Sony Alpha Rumors first spotted the Japanese patent, which describes a lens designed for a curved 645 size sensor—that’s bigger than the sensors found in the Fuji GFX-50s and Hasselblad X1D-50c. The lens is “single focus” and “can be used as an interchangeable lens” reads the translated patent. It goes on to say that, thanks to the curved sensor design “High MTF can be obtained.”

Here’s are a couple of diagrams, in case you’re curious and know a thing or two about optical design. The lens seems exceptionally simple in design, possibly thanks to the benefits of a curved sensor:

As with all patents, there’s plenty of reason to doubt this exact diagram will materialize into a real product; however, it does mean Sony is thinking about medium format and curved sensors, and that should have anybody interested in digital camera innovations very excited.

Like we said earlier today, it’s not so much “will” someone bring this tech to photographers, but “when” and “who will get there first?” May the most innovative company win.

Articles: Digital Photography Review (dpreview.com)

 
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Video: Sony a9 falls short with Canon 300mm and 400mm lenses attached

24 Jun
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Sports shooters considering Sony’s speedy a9 have one major hurdle to overcome: glass. There’s a dearth of long, fast primes available to Sony FE shooters, and it seems like using off-brand glass while you wait for Sony to catch up just isn’t a great option.

In this video, photographer Dan Watson of Learning Cameras tried both the Sigma MC-11 and Metabones Mark IV lens adapters to test how well the a9 worked when attached to the Canon EF 300mm F2.8L IS II USM and Canon EF 400mm F2.8L IS II USM.

Watson mainly wanted to test the focusing capabilities, and unfortunately, the results were somewhat disappointing.

Before you dive into the video, it’s worth pointing a few things out. Our own Rishi Sanyal has tested the focus capability of the a9 with adapted lens, and points out a couple of caveats to Watson’s otherwise solid points:

First, the performance of far off-center AF points depends on the lens. While Watson is correct in pointing out that they don’t perform well with long lenses (despite working astonishingly fast with Sony’s own 100-400 F4.5-5.6), they do work well with shorter focal lengths (we’ve had success with a Sigma 85/1.4, Canon 35/1.4, 24-70/2.8, etc.). With these wider lenses, ‘Wide’ area mode will continue tracking subjects to the extremes of the frame.

Second, Sony A-mount lenses adapted with the LA-EA3 adapter do shoot at an impressive 10 fps with autofocus, something we confirmed with the 50/1.4 (as long as you’ve updated the firmware of the adapter).* With the Metabones and Sigma adapters though, as with all Sony FE bodies, only the L drive mode offers continuous focus. And it’s actually only 2.5 fps, not the 5 fps Watson mentions (technically L is 3 fps, but it slows to 2-3 fps with continuous focus).

With that out of the way, Watson’s video is a great resource for seeing how well (or not) the a9 performs when attached to the long, fast Canon primes sports shooters love. And while single-shot focus with central points is speedy and almost 100% accurate with long adapted lenses, the lack of true subject tracking (Lock-on AF modes) or continuous focus at speeds higher than ~2.5 fps (or in video) will probably be a deal breaker for many fast-action photographers.

Once you’ve lost the impressive high speed shooting advantages Sony baked into the a9, you might as well be shooting with any other camera. Moral of the story: stick to Sony glass and hope they keep churning out new lenses at break-neck pace.

You can watch the full demo for yourself up top. And if you’re considering jumping ship from Canon to Sony, keep this information in mind – like all previous Sony bodies, you’ll only have access to the a9’s slowest continuous drive mode when you’re adapting your own glass.


* We’ve not yet confirmed the performance of off-center points with long A-mount glass.

Articles: Digital Photography Review (dpreview.com)

 
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An array of Canon 400mm F2.8L II lenses is helping astronomers discover new galaxies

27 Oct
The Dragonfly Telephoto Array. Photo by Pieter van Dokkum

When Astronomer Pieter van Dokkum was looking for ways to study galaxies, he turned to the equipment he was familiar with as an amateur photographer. Thanks in part to some advanced optical coatings, he and his research team have been able to discover previously unseen galaxies.

In 2011, van Dokkum and fellow professor and astronomer Roberto Abraham, were discussing ways to find a way to get a better look into the very diffuse cosmic light that’s scattered by traditional telescopes like Hubble. Van Dokkum’s thoughts turned to his consumer imaging equipment, and some claims Canon was making about its then-recently-released 400mm F2.8L II. 

Introduced in August the previous year, the 400mm F2.8L II offers what Canon calls ‘a SubWavelength Structure Coating (SWC), which uses microscopic cone-shaped structures smaller than a wavelength of visible light’ to reduce internal reflections and scattered light. This kind of coating would theoretically help collect enough light to study galaxies with low ‘surface brightness’, and sure enough, it did. Says van Dokkum: ‘We compared their performance to those of the best reflecting telescopes, and found that they produce almost an order of magnitude better suppression of the wings of the point spread function – probably in part because of the SWC coatings.’ In short, the 400mm F2.8L II fit the bill.

More lenses were acquired and the Dragonfly Telephoto Array was born (clustering lenses allows researchers to increase the effective aperture of the system). Van Dokkum and Abraham started with eight lenses, and now operate two mounts with a total of 48 lenses.

Custom connectors, as well as off-the-shelf components like Intel Compute Sticks help drive Dragonfly. Photo by Pieter van Dokkum

You won’t find a Canon EOS 5DSR behind anywhere on the array, though. Each lens is attached to its own science-grade 8MP CCD camera, and has a custom astronomical filter slotted in. There’s a custom-built connector between each camera and the lens that can drive focus, and an Intel Compute Stick attached to each camera takes care of data recording and some processing. It’s all controlled by a central computer that can carry out commands like ‘auto-observe Mars’ and ‘expose 900 seconds’. 

The array has helped examine much-observed heavenly bodies like the Coma Cluster, where they’ve been able to identify what the research team has dubbed ‘ultradiffuse galaxies.’ They continue to discover more of these galaxies with the help of Dragonfly, and aim to keep learning about their variety and formation. 

Articles: Digital Photography Review (dpreview.com)

 
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Writer’s Favorite Lens – the Canon 400mm f/2.8

20 Mar

Being a sports photographer, covering things ranging from soccer (football) and rugby, to horse racing, I often have the Canon 400mm f/2.8L IS II USM on one of my camera bodies. It’s this lens’ focal length and fast aperture that is most helpful. I love this lens for its image quality and performance, but also its versatility.

Fig 12

Image courtesy of Canon.

So let’s have a look at the specs of this lens:

  • Focal length: 400mm (560mm APS-C approximate)
  • Maximum aperture: f/2.8
  • Maximum diameter x length: 163mm x 343mm (6.41 x 13.50″)
  • Weight: 3.85 kg (8.48 lbs)
  • Image stabilized? Yes, four stops
  • Minimum focusing distance: 2.7m (8.85′)
  • Weather sealed: Yes

PROS

Ideal Sports Lens

The 400mm focal length of this lens is ideal for many field based sports such as soccer (football) and rugby as it’s not too long, such as a 500mm for example, but at the same time it’s gives more pull than a 300mm. Its fast f/2.8 aperture is very handy when photographing in low-light situations, such as at night matches where the light is often quite low, as it allows me to use a lower ISO and still be able to maintain a shutter speed that is fast enough to freeze the action. This maximum aperture is also ideal to nicely isolate the subject from a busy background and make them pop more. Although I don’t always shoot at f/2.8 (generally hovering around f/3.5-f/4) having the ability to use f/2.8 is quite handy.

As far as focussing speed goes, this lens is blazingly quick and spot-on accurate, especially when coupled to a 1D X, for example. It easily locks on to a subject without any search or lag whatsoever.

In the following images, the 400mm focal length has been fantastic at pulling the subject in closer than what a 70-200 or 300mm for example, would be able to offer. These images have still been cropped, but not as much as would be needed if I had used a shorter focal length.

© Daniel Smith / Getty Images.

© Daniel Smith / Getty Images.

© Daniel Smith / Getty Images.

© Daniel Smith / Getty Images.

Versatility

Being quite heavy and long, with no zoom, you may think that this lens would only be suited to use on the sidelines of a sports field, attached to a monopod. However, this lens is much more versatile than that. Being the series two version of this lens, it is significantly lighter than its predecessor. This reduction in weight means that I am now able to use this lens hand-held (if I’m using it for extended period of time, I do use a monopod; it’s not that light!) which opens up more options. For example, I have photographed live concerts with this lens; a lens that is rarely used because of its long focal length. But it’s this focal length, coupled with an f/2.8 aperture, that I love. Photographing through the crowd is fantastic, as I am able to create abstract shapes through the silhouettes created by the audience, and use them to frame my subject.

The longer focal length can also be great when covering conferences, as I am able to photograph further back. This is especially helpful if the speakers are on a stage, as standing further back will reduce the angle in which you look up, and enable you to reduce the distortion that looking up can cause.

Fig 3

This was taken from further back. The speaker was on a stage. By standing back I was able to photograph the speaker and be closer to his level. The aperture also provided some great bokeh with the lights in the background.

Fig 1

400mm, 1/500sec, f/3.2 ISO 6400. The singer raising her hand is made stronger by the abstract hand being raised by the fans.

Fig 2

400mm, 1/500sec, f/3.5 ISO 6400. Shooting through the fans with their hands in the air adds some great foreground interest to this image.

In addition, its fast f/2.8 aperture lends itself to use with teleconverters if extra reach is needed. When adding one, you multiply the aperture and focal length by the strength of the teleconverter; so if you are using a 2x, it would make this lens an 800mm f/5.6. And because its image quality is so good, the degradation to image quality when using converters isn’t really noticeable with this lens. Its AF also does not really take much of a hit, either. So for the price of a couple of teleconverters, I potentially have three lenses in one:

  • A 400mm f/2.8 as it is
  • A 560 f/4 with a 1.4x teleconverter
  • a 800 f/5.6 with a 2x teleconverter

CONS

Cost

This lens is not the cheapest lens on the market; Amazon has it listed at $ 9,999 USD, so this lens is definitely not something many photographers would consider purchasing.

An alternative to this would be the Canon 400mm f/5.6L USM which sells for a much more affordable $ 1,199 USD. The biggest drawback with that lens, however, is its maximum aperture of f/5.6, which would not be very useful in low-light situations, where a wider aperture is much more beneficial.

Image courtesy of Canon.

Image courtesy of Canon.

Size

This isn’t the smallest lens either, and you will generally be very noticeable with it. Using this as a street photography lens would not be ideal, and would make you quite a target! You will also need quite a large bag to carry this in, although it does come with its own hard-case as seen here.

Weight

Even though this is the series two, and much lighter that its predecessor, at nearly 4kg (almost 8.5 pounds) this is definitely not a light lens! You will need a monopod with this lens if you intend to use if for long periods of time. Transporting it also requires quite a large bag; a roller bag being ideal as you don’t have to carry it. I transport all of my equipment in the one bag generally – a ThinkTank Photo Airport Security V2.0 roller bag. This makes carrying not only this lens, but all of my equipment much easier, and saves injuring my back.

ALTERNATIVES

This lens is not for everyone, primarily because of its high cost. If you would love to have one of these in your kit but don’t have the finances available, going second hand is an option. A used 400mm f/2.8L IS USM (non-Series II) is still a fantastic lens and can be found relatively (compared to the new version) cheaply at around $ 4,000-$ 5,000 USD.

If that’s still pushing the financial friendship a little consider these:

  • Canon 100-400mm f/4.5-5.6L IS II USM at $ 2,099 USD (or the original for $ 1389)
  • Canon 400mm f/5.6L USM at $ 1,149 USD
  • Or the many offerings from Sigma, Tamron and Tokina which have the 400mm focal length covered

CONCLUSION

While this is the heaviest lens it my kit, the image quality and performance from it is unmatched, and definitely make it worthwhile carting around. With a little practice using a prime super-telephoto, you can create some striking images that you just cannot achieve with shorter focal lengths. The large aperture and the bokeh it produces at 400mm is dreamy, too!

I really enjoy using this lens in areas that it typically would not be used. It doesn’t always work in those situations, but is a lot of fun nonetheless. Do you have a long telephoto lens? What do you shoot with it? Please share your thoughts in the comments below.

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The post Writer’s Favorite Lens – the Canon 400mm f/2.8 by Daniel Smith appeared first on Digital Photography School.


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Nikon announces updated 400mm F2.8 telephoto and 1.4x teleconverter

14 May

400e-news.png

Nikon has announced updated versions of its 400mm F2.8 telephoto lens and 1.4x teleconverter. The AF-S Nikkor 400mm f/2.8E FL ED VR promises improved autofocus, exposure accuracy and speed, while being 816g (nearly 2lb) lighter than its predecessor. Meanwhile the AF-S Teleconverter TC-14E III  features revised optics, and a redesigned barrel for increased moisture and dust resistance. Both will be available in August 2014, with RRPs of $ 11,999.95 and $ 499.95 respectively. Learn more

News: Digital Photography Review (dpreview.com)

 
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Lens reviews update: DxOMark data for 400mm telezooms compared

29 May

lensreview-thingsmall1.png

DxOMark has tested two recently-announced announced long telezooms, the Sony 70-400mm F4-5.6 G SSM II and the Nikon AF-S Nikkor 80-400mm f/4.5-5.6G ED VR, as well as the older AF Nikkor 80-400mm f/4.5-5.6D ED VR. As part of our ongoing collaboration we’ve added the test data to our lens comparison widget, and to add a little more context we’ve also included a couple of super-tele primes from Canon. Click through to see how these lenses compare, with links to view the results in our lens widget, and for the full data on DxOMark.

News: Digital Photography Review (dpreview.com)

 
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400mm LENS TEST | Canon 100-400 vs Tamron 200-400 vs Tokina 400mm | www.Budgetfilmmaker.co.uk

18 Jan

This is just a very quick overview and some test footage of 4x 200mm lenses. A full write-up with analysis and more in depth info on each lens can be found my here: www.budgetfilmmaker.co.uk I now have about 80 lenses to test, so if you like the idea of cheap lenses for video work, please SUBSCRIBE to make sure you don’t miss the upcoming test videos. Follow BF on tweeter for latest updates: twitter.com
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www.artoftheimage.com – Zoom H2 Mic Review – My Favourite Mic (DSLR Video D7000 D5100 T3i 600D T2i 550D 60D 7D 5D MkII)Check out the new Art of the Image Recommended Photography Gear List at http PS If you have kids or know someone with kids, check out my latest online book, “Diary of a Nerd King” at www.nerdkingdiary.com. It’s funny and it’s FREE! Please pass it along… thanks! PSS If you have toddlers or small children, check out http for my children’s ebooks for Kindle, iPad, iPod, iPhone, laptops, etc! Please pass it along… thanks!
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