Tag Archives: bald eagle

Nikon TC-14E III

The Nikon TC-14E III teleconverter increases a lens' effective focal length by 40 percent. (Bill Ferris)

The Nikon TC-14E III teleconverter increases a lens’ effective focal length by 40 percent. (Bill Ferris)

Teleconverters have a long and complex history in photography. In 1833 – six years before Louis Daguerre invented the daguerreotype process that launched a worldwide fascination with a new artistic medium, photography – Peter Barlow invented a negative lens that, when fitted to a telescopic eyepiece, extended the effective focal length of the telescope in which Mr. Barlow’s lens was used. In so doing, the magnification of the lens and the image scale of the subject were also increased. Known simply as the Barlow lens, this optical accessory is widely used by amateur astronomers. Commonly available in 2x and 3x versions, the modern Barlow is especially popular with lunar and planetary observers.

Nearly sixty years later in 1891, Thomas Dallmeyer and Adophe Miethe simultaneously developed nearly identical optical designs for photographic telephoto lenses. Both designs featured a front achromat doublet lens system and a rear achromat triplet grouping. The rear lens grouping acted much as Barlow’s negative lens, increasing the effective focal length of the front imaging elements. Dallmeyer and Miethe had independently invented the first photographic teleconverters.

Today’s modern teleconverters are also quite popular though not without their critics. No optical lens system is perfect and the teleconverter is certainly no exception. In addition to magnifying the subject of a photograph, a teleconverter also magnifies optical aberrations, making them more readily apparent. Commonly found in 1.4x, 1.7x and 2.0x versions, teleconverters typically magnify by as little as 40% (1.4x) and as much as 200% (2x). The biggest cost of this increased magnification is a loss of image brightness. By increasing the effective focal length of the lens while keeping the lens’ physical aperture constant, the maximum focal ratio of the lens increases by an amount proportional to the increase in effective focal length. For example, a 1.4x teleconverter increases focal length and focal ratio by 40%. A 200mm f/4 lens becomes a 280mm, f/5.6 lens. The teleconverter results in a loss of one stop of light.

A teleconverter attaches to both the lens and the camera as an intermediary lens within a photographic optical system. The TC-14E III is an f-mount design that is compatible with all Nikon film cameras and DSLR cameras. Nikon teleconverters are generally compatible with longer focal length telephoto and telephoto zoom lenses. (Bill Ferris)

A teleconverter attaches to both the lens and the camera as an intermediary lens within a photographic optical system. The TC-14E III is an f-mount design that is compatible with all Nikon film cameras and DSLR cameras. Nikon teleconverters are generally compatible with longer focal length telephoto and telephoto zoom lenses. (Bill Ferris)

This increase in focal ratio has a couple of potentially significant drawbacks. Compared to an f/4 lens, an f/5.6 lens will require an exposure twice as long to render a properly exposed image. Another option would be to increase the ISO (in-camera exposure brightening) or increase the brightness of the exposure during post-processing. Either approach will introduce some additional noise into the final image.

Another potential issue that results from an increase in focal ratio, is that of compromised autofocus performance. The brighter the image falling on the sensor, the faster and more accurate the camera’s autofocus system tends to be. As the f-stop used to make an image increases and image brightness on the sensor decreases, the camera eventually will not have enough light for reliable autofocus performance.

Because the function of a teleconverter (TC) is to extend the reach of a lens, to bring a photographer nearer the subject without having to physically move closer to the subject, it is a popular accessory for wildlife and bird photographers. With my growing interest in this type of photography and the recent purchase of a Nikkor 200-500mm f/5.6E VR telephoto zoom lens, I decided to give the Nikon TC-14E III 1.4x teleconverter a try. Attached to the new lens, the TC-14E III would have the effect of extending its zoom range to 280-700mm. The TC-14E III also facilitates communicates between the lens and camera, including effective focal length, f/-stop, shutter speed, AF mode, burst mode…the full suite of functionality one would expect of a Nikkor lens mounted to a Nikon camera body,

The main price to be paid for the extended reach achieved with a TC is an increase of the lens’s maximum f-stop. In the case of the 200-500mm f/5.6E, the focal ratio increases from f/5.6 to f/8. At f/8, the zoom would be operating at the very threshold of my Nikon D610’s ability to autofocus. This raised two issues of concern: would the lens be sharp at 700mm and would the f/8 maximum focal ratio allow for adequate autofocus performance?

A juvenile bald eagle soars over Lake Mary on a mid-winter northern Arizona day. (Nikon D610 w/ Nikkor 200-500mm f/5.6E and TC-14E III at 700mm, f/11, ISO 2500, 1/2000-second)

A juvenile bald eagle soars over Lake Mary on a mid-winter northern Arizona day. (Nikon D610 w/ Nikkor 200-500mm f/5.6E and TC-14E III at 700mm, f/11, ISO 2500, 1/2000-second)

One of the biggest technical challenges of bird and wildlife photography is capturing birds in flight. It is this aspect that makes bird photography so appealing to me, the challenge of mastering my equipment and expanding my knowledge of the animals to make good photographs. Bird photography also gives me an excuse to get out in nature and to be near these magnificent creatures. When the TC-14E III arrived, I couldn’t wait to run it through its paces by photographing the eagles, hawks and other birds found during winter in northern Arizona.

The above photograph of a juvenile bald eagle in flight illustrates the challenges I’ve been working to overcome. As you can see, the photo was made on a bright, sunny day. I used a shutter speed of 1/2000-second to freeze the action. The 200-500mm is at full zoom, which produces an effective focal length of 700mm with the 1.4x teleconverter attached. The maximum f-stop is f/8 but I chose to work at f/11 to produce an image with greater sharpness. In the photo’s caption, you’ll notice an ISO of 2500 for this exposure. That’s very high for a bright, sunny day. Now, if the above were a full 6,000 by 4,000 pixel image, the level of noise at that ISO would be quite acceptable. However, even at 700mm focal length, the raptor only covers about 1/5 the surface area of the D610’s sensor. The above image represents roughly a 2500 by 1700 pixel crop, which makes the noise more noticeable. In fact, I would judge the level of noise to be at the very threshold of what I consider, acceptable.

Canada geese cruise the northern Arizona sky near Mormon Lake on a mid-winter's day. (Nikon D610 w/ Nikkor 200-500mm f/5.6E and TC-14E III at 700mm, f/9, ISO 720, 1/2000-second)

Canada geese cruise the northern Arizona sky near Mormon Lake on a mid-winter’s day. (Nikon D610 w/ Nikkor 200-500mm f/5.6E and TC-14E III at 700mm, f/9, ISO 720, 1/2000-second)

The above photo of Canada geese flying through northern Arizona’s winter sky is a roughly 1500 by 1500 square aspect crop. Notice the shutter speed is the same 1/2000-second exposure as used to make the previous image of a bird in flight. Also, please note the f-stop and ISO. The f-stop is f/9 or 2/3-stop brighter than the first image. As a result, the ISO is much lower. This was another bright, sunny day in northern Arizona so, lower the f-stop (increasing the aperture) allowed me to make an image with much less post-exposure brightening. At ISO 720, I was able to do an even more significant crop but without the noise penalty of the first image.

ISO, is the central issue when using a teleconverter with a moderately fast lens. Pro telephoto lenses offer maximum f-stops in the f/2.8 to f/4 range. The large apertures of these long lenses collect and deliver a lot of light to the sensor. As a result, even with a 1.4x TC in the mix, they still operate at f/4 or f/5.6, delivering enough light to the sensor to allow a camera’s AF system to be snappy and accurate. Using the TC-14E III with a lens such as the 200-500mm f/5.6E, a modestly slow zoom, immediately puts you right at the brink of acceptable performance.

The 200-500’s maximum f-stop (with the TC) is f/8. At f/8, the optical system captures images with noticeable softness and chromatic aberration. Closing down the aperture just by 1/3-stop to f/9 largely compensates for these aberrations and allows the lens to deliver crisp, true color images to the sensor. At f/9, the lens is operating outside Nikon’s official boundary for full AF performance. At f/9, you’ll no longer be able to work in AF-C, 3D mode. That option isn’t even available in the D610’s menu at f/9. However, I’ve been able to get good AF performance in AF-C, 9-point mode, my preferred autofocus setting for dynamic bird and wildlife situations.

A western bluebird sits perched atop a common mullein near the windswept waters of lower Lake Mary in northern Arizona. (Nikon D610 w/ Nikkor200-500mm f/5.6E at 700mm, f/8, ISO 1600, 1/2000-second)

A western bluebird sits perched atop a common mullein near the windswept waters of lower Lake Mary in northern Arizona. (Nikon D610 w/ Nikkor200-500mm f/5.6E and TC-14E III at 700mm, f/8, ISO 1600, 1/2000-second)

The above photo illustrates the price one pays when losing focus even for a moment while doing photography with an f/5.6 (or slower) telephoto and a teleconverter. Again, this photo was made on a bright and sunny afternoon. I shot with the 200-500 and 1.4x TC combo wide open at f/8. Why? It was late in the afternoon. The sun was about an hour from setting, low on the western horizon and not quite as bright as during a midday exposure. Notice the shutter speed of 1/2000-second. That’s for a photo of a perched bird. OK, the bluebirds were flitting from plant-to-plant and not spending more than a few seconds on any one perch. However, when they’re perched, the birds aren’t moving…at least, not nearly as much as when in flight. By shooting at 1/2000-second in late day light, the ISO was jacked up to 1600. I probably could have used a shutter speed of 1/800-to-1/1000-second, which would have cut the ISO to 800 or less.

What saved this exposure was the fact that I’d noticed the western bluebirds flitting about from stalk to stalk and had pre-focused on this stalk, ahead of time. It’s still a cropped final image but at approximately 3350 by 2240 pixels, there’s enough real estate on the camera sensor to mitigate the noise. If this was shot with a 500mm f/4 telephoto and the Nikon 1.4x TC, I could have shot at f/5.6 and kept every other setting the same with the camera selecting and ISO of 800 or lower. Being a professional quality optic, the 500mm f/4 would probably be very sharp even wide open with a TC. With a consumer, telephoto zoom such as the 200-500, the margin for error is much more narrow. You’ve got to pay attention to the details and look for every opportunity to balance that f-stop/shutter speed/ISO triangle in your favor.

A red-tailed hawk launches from atop a Ponderosa Pine along Lake Mary Rd near Flagstaff, Arizona. (Nikon D610 w/ Nikkor 200-500mm f/5.6E at 700mm, f/9, ISO 720, 1/1600-second)

A red-tailed hawk launches from atop a Ponderosa Pine along Lake Mary Rd near Flagstaff, Arizona. (Nikon D610 w/ Nikkor 200-500mm f/5.6E and TC-14E III at 700mm, f/9, ISO 720, 1/1600-second)

Here’s an image that’s a product of a collection of lessons learned during my first few weeks of ownership of the TC-14E III 1.4x teleconverter. It’s a photo that was made in good light on a  clear day. The red-tailed hawk was perched atop a Ponderosa pine scanning the nearby shallow water lake. Anticipating the bird would launch within a few minutes (at most) of my arrival, I had selected a shutter speed of 1/1600-second…fast enough to mostly freeze the action of wings flapping but slow enough to catch a bit of motion and convey a hint of the dynamic action. I chose an f-stop of f/9 to noticeably sharpen the resulting image while still putting a bright image on sensor. The combination of these choices resulted in an exposure where the D610 chose an ISO of 720. In my experience, keeping ISO at or below 1000 is essential to producing noise-free images in exposures that will likely be significantly cropped.

After shooting with the TC-14E III on the Nikkor 200-500mm f/5.6E VR zoom lens for several weeks, I’ve learned the following:

  • The TC-14E III is sharp. Comparing exposures made with the bare 200-500 and exposures made with the combo of the 200-500 and TC at equivalent focal lengths, any differences in image quality are subtle, at most, and only discernible at the pixel level.
  • When shooting at 700mm, I prefer to stop down the combo to f/9. Even the 1/3-stop closure is enough to noticeably improve image quality. Beyond that, IQ does improve up to about f/11. However, the gain is so marginal as to be not worth (in my opinion) the associated loss of quality that comes from using a higher ISO or (for BIF) a slower shutter speed.
  • For best image quality when photographing BIF (a scenario where significant cropping of the resulting image is likely), I target a shutter speed of 1/2000-second but will slow the shutter shutter speed to 1/1000 in low light and will slow the shutter speed to 1/500 for perched birds.
  • I need to continue experimenting with shutter speed. At 1/1000-to-1/1600, the wing motion blur helps convey the dynamic action of flight. It’s not unlike prop blur in photographs of piston engine planes in flight. The prop blur conveys the power of the plane. Wing blur with a sharply focused face communicates the dynamic nature of the bird.
A juvenile bald eagle gazes intently in search of a distant opportunity for a meal or an approaching threat. (Nikon D610 w/ Nikkor 200-500mm f/5.6E and TC-14E III at 700mm, f/11, ISO 450, 1/800-second)

A juvenile bald eagle gazes intently in search of a distant opportunity for a meal or an approaching threat. (Nikon D610 w/ Nikkor 200-500mm f/5.6E and TC-14E III at 700mm, f/11, ISO 450, 1/800-second)

I’ll leave you with one last sample image. The 200-500/teleconverter combo is great for perched birds. In good light, I can close the aperture to ensure tack sharp detail, make exposures at relatively slow shutter speeds (under 1/1000-second), and still keep ISO under 1000. These settings deliver excellent detail in a properly focused image.

With all that potential awaiting you, there’s no excuse. Get out and shoot.

Bill Ferris | March 2016

The Big Fix

Photo made with Nikon D610 and Nikkor 200-500mm f/5.6E at 500mm, f/16, ISO 100, 1/250-second

Photo made with Nikon D610 and Nikkor 200-500mm f/5.6E at 500mm, f/16, ISO 100, 1/250-second

I can clearly recall the exact moment when I realized there was a problem with my Nikon 200-500mm, f/5.6E telephoto zoom lens. It was on the afternoon of Wednesday, November 11, 2015. I had the day off from work and was setting up in the backyard to make some test photos demonstrating the effectiveness of the new lens’s vibration reduction (VR) feature. It was the above photo that caught my eye and started me down a challenging, sometimes frustrating road that would take nearly six weeks to complete. I’m some respects, I’m still on that road.

The above image caught my attention because it is so obviously overexposed. It was also totally unexpected. I had been using a hula dancer toy as a photographic subject to test the vibration VR of the 200-500mm lens. Reviewing the rest of the images in the sequence, the image shot at f/5.6 appeared to be properly exposed but the images made at f/8 and higher were overexposed. It also appeared that the degree of overexposure increased in proportion to the increase in f-stop setting used. The above image was made with a setting of f/16 and is about 2 stops overexposed.

In a nutshell, what I had discovered was that my Nikon D610 camera body was not able to control the electromagnetic diaphragm of the 200-500mm lens. The diaphragm determines the aperture of the lens, which controls the amount of light hitting the sensor. Lens aperture (f-stop) along with ISO and shutter speed form what is commonly referred to as the exposure triangle. A compatible trio of settings produces a properly-exposed image. If one of the settings is off, the resulting image will look either over- or underexposed.

That same day, I called Nikon USA’s service and support line and spoke with a call center agent. I described the problem and, ultimately, was advised to send in the lens for evaluation. Just a month earlier in October 2015, I had shipped the lens to Nikon for a firmware upgrade. The shipping and upgrade were covered under warranty for that service center visit. The UPS charge for this shipment would come out of my pocket.

The lens went out via UPS on Wednesday, November 11 and arrived at Nikon’s Los Angeles service center on Friday, November 13. (I chose not to take that as an omen.) The following Monday, November 16, I received an email from Nikon with an estimate for service to the lens. Nikon intended to address the problem with a firmware upgrade, which would be covered under warranty. After reading this, I contacted Nikon via their online service and support site, asking if this was the same firmware upgrade which had already been performed, a month earlier. The email reply to my query read, “Thank you for contacting Nikon. This is covered under warranty and this is the appropriate firmware update. If you have questions or concerns, please call or e-mail us.”

Well, OK then.

The upgrade was done and the lens shipped back at Nikon’s expense, arriving via UPS on November 23. It didn’t take more than a couple of minutes to confirm that the firmware upgrade had done nothing to correct the problem. To more fully document this issue, I made a series of exposures of my favorite test subject to demonstrate the increasing degree of overexposure at larger f-stop settings. Below, are several of the images I uploaded to the Nikon USA service center site for a technician to review.

Photo made with Nikon D610 and Nikkor 200-500mm f/5.6E at 300mm, f/5.6, ISO 100, 1/640-second

Photo made with Nikon D610 and Nikkor 200-500mm f/5.6E at 300mm, f/5.6, ISO 100, 1/640-second

Photo made with Nikon D610 and Nikkor 200-500mm f/5.6E at 300mm, f/8, ISO 100, 1/400-second

Photo made with Nikon D610 and Nikkor 200-500mm f/5.6E at 300mm, f/8, ISO 100, 1/400-second

Photo made with Nikon D610 and Nikkor 200-500mm f/5.6E at 300mm, f/11, ISO 100, 1/200-second

Photo made with Nikon D610 and Nikkor 200-500mm f/5.6E at 300mm, f/11, ISO 100, 1/200-second

Photo made with Nikon D610 and Nikkor 200-500mm f/5.6E at 300mm, f/16, ISO 100, 1/100-second

Photo made with Nikon D610 and Nikkor 200-500mm f/5.6E at 300mm, f/16, ISO 100, 1/100-second

Tuesday, November 24, I had another phone conversation with a call center agent. I again described the problem and explained that it appeared my Nikon D610 camera was unable to control the lens’s electromagnetic diaphragm. I also shared that I’d made test exposures with four other F-mount lenses: the Nikkor 16-35mm f/4, Tamron 24-70mm f/2.8 VC, Tamron 70-200mm f/2.8 VC and Nikkor 70-300mm f/4.5-5.6. There was no overexposure problem with these lenses and it appeared the problem was isolated just to the 200-500mm f/5.6E lens.

The day before Thanksgiving, November 25, I received an email from a Nikon technician who’d reviewed the above images. In his message, the technician asked that I ship both the D610 camera and the 200-500mm lens for evaluation and possible service. A UPS shipping label was attached. As reluctant as I was to be without my primary camera and the new lens, I wanted to get the problem resolved as quickly as possible. So, I boxed up the D610 and lens, drove to the nearest UPS shipping center and sent my babies off to LA for some TLC.

December was a long month. I had the privilege of serving on a jury for a criminal trial the first week of the month. Several major work projects were due for completion over the next two weeks and I would be traveling with family for the holidays, beginning December 22. Needless to say, I was anxious to have the camera and lens back, both in good working order, in time for the family trip to California. The month was further disrupted when I received news that a close high school friend had passed away. Travel to the Midwest for the funeral took out of town for several days.

I arrived home the afternoon of Sunday, December 20 to find two packages from Nikon sitting on the dining room table. One, was my D610 camera. The other, was my 200-500mm lens. After unpacking my suitcase and getting settled, I fetched a cutting tool from our kitchen utility drawer and opened the packages. A few minutes later, the 200-500 was firmly affixed to the D610 and ready to make images.

To my great relief, the camera and lens made properly-exposed images at a range of apertures. It appeared that Nikon had successfully repaired the problem. What repairs did they make? It’s not entirely clear but, according to the packing slip accompanying the lens, Nikon did the following work:

  • Repaired aperture operation
  • Replaced diaphragm and ring
  • Replaced a lens group
  • Adjusted aperture operation
  • Checked focus and VR operation.
  • Did a general exam and cleaning of the lens

My D610 camera body was also evaluated and found to be in good working order. It was checked and cleaned before return shipment.

Since receiving the repaired lens back from Nikon and during trips to California and New Mexico, I’ve made nearly 3,500 exposures at a range of apertures from f/5.6 to f/16. All appear to be correctly exposed. Below, are a few samples.

White-tailed Kite. Photo made with Nikon D610 and Nikkor 200-500mm f/5.6E at 500mm, f/8, ISO 500, 1/2000-second

White-tailed Kite. Photo made with Nikon D610 and Nikkor 200-500mm f/5.6E at 500mm, f/8, ISO 500, 1/2000-second

Alcatraz. Panoramic stitch made with Nikon D610 and Nikkor 200-500mm f/5.6E at 500mm, f/10, ISO 800, 1/2000-second

Alcatraz. Panoramic stitch made with Nikon D610 and Nikkor 200-500mm f/5.6E at 200mm, f/10, ISO 800, 1/2000-second

Javelina on parade. Photo made with Nikon D610 and Nikkor 200-500mm f/5.6E at 500mm, f/13, ISO 4500, 1/200-second

Javelina on parade. Photo made with Nikon D610 and Nikkor 200-500mm f/5.6E at 500mm, f/13, ISO 4500, 1/200-second

Eagles on ice. Photo made with Nikon D610 and Nikkor 200-500mm f/5.6E at 500mm, f/16, ISO 640, 1/250-second

Eagles on ice. Photo made with Nikon D610 and Nikkor 200-500mm f/5.6E at 500mm, f/16, ISO 640, 1/250-second

I am, of course, thrilled to have my lens back in good working order. Though some additional time is needed before I’ll have full confidence that the repair to the lens completely resolves the diaphragm-control problem, I have been extremely satisfied with the lens’s performance over the last several weeks. I also understand that equipment sometimes fails. That’s what warranties are for. I don’t fault Nikon for the mechanical failure to their product and am genuinely grateful that they addressed the problem in a forthright and timely manner.

I would like to take this opportunity to share some advice I’ve offered Nikon through email communication. In a nutshell, I’ve recommended Nikon update their service and support system to provide…

  • customers email updates about the status of their repair and estimated time of completion.
  • customers access to a Nikon technician who can explain in plain language the problem being addressed.
  • call center staff access to a customer database with detailed information about past and ongoing product service and repairs.

While I am satisfied with the outcome of this service and repair experience, there were times during those six weeks when the lack of information and the inability to communicate with a technically-proficient Nikon employee added to my level of frustration. The experience could have been made less stressful if I’d been provided regular updates on the status of my repair, had the opportunity to communicate by phone or instant messaging with a technician about the symptoms I was experiencing, and if I had not needed to explain the problem to four different call center staff members, none of whom appeared to have access to a detailed history of this particular repair.

I love using and doing photography with Nikon products and welcome the opportunity to remain a Nikon customer for many years to come. That said, their customer support could use some work. Whether you’re a Nikon employee, a fellow photographer or a friend, please take this blog entry in the spirit in which it is offered: an objective recounting of a recent customer service experience and an effort to provide constructive feedback to a company whose products I truly enjoy using.

Well, I’ve been rambling on about this far too long. It’s time for me to get out and shoot!

January 2016 | Bill Ferris