The TC-20eIII is optically better than the TC-17e, which is MUCH better than the TC-20eII. The III has a new aspheric optical formula that is MUCH better than previous 2x TCs. Of course, as with any TC, the more powerful the TC, the more light you lose.
_____ Brian... a bicoastal Nikonian and Team Member
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Most people think sharpness wise there is no difference between the 1.7TCII and the 2.0TCIII. There is a difference in focus speed and aperture that may make a difference to you. I have found that the 2.0TCIII does not work nearly as well on the 70-200 f2.8 VRI as it does on a prime like the 300 f2.8 VRI. I would be reluctant to use a 2.0TC on a zoom lens, I think the IQ would suffer enough to find another option if I needed the longer reach.
>I have found that the 2.0TCIII does not work nearly as >well on the 70-200 f2.8 VRI as it does on a prime...
I have found the TC-20E III to work better on the newer "II" version of the 70-200mm f/2.8 than on the original version. One does - inevitably - lose something in image quality as well as focusing speed, but on those occasions when I need 400mm and don't want to carry a bigger prime, the combination does the job
I am going to Alaska in September ..I plan to take a helicopter ride to photograph Mount McKinley ...I have 18-300 Nikor lens and wonder about using a 1.7 or 2.0 TC? I also have 35mm,50mm, 85mm prime lenses and does anyone use a TC with them? In landscape ..maybe 300mm is enough to get crisp images .. any thoughts would be appreciated .. thanks ....this is my first post
I am going to Alaska in September ..I plan to take a helicopter ride to photograph Mount McKinley ...I have 18-300 Nikor lens and wonder about using a 1.7 or 2.0 TC? I also have 35mm,50mm, 85mm prime lenses and does anyone use a TC with them? In landscape ..maybe 300mm is enough to get crisp images ..
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None of those lenses are compatible with Nikon's current line of teleconverters. While one of the Kenko DG teleconverter will probably work with your 50mm and 85mm primes, Kenko states that their teleconverters "are are designed specifically to be used with prime telephoto lenses of 100mm or above ... and work best with telephoto lenses of 200mm to 500mm."
Kenko "does not recommend them for zoom lenses that have a range starting under 50 mm," which excludes the 18-300mm. Personally, I'd be worried that the rear element of that zoom lens could come in contact with the front element of the teleconverter, with disastrous results.
I'd suggest calling the tour operator and asking for suggestions on which focal lengths to use. Especially with a DX camera, I'd expect 300mm to be more than enough reach for such a flight.
"There is no real magic in photography, just the sloppy intersection of physics and art." — Kirk Tuck
Thanks very much for saving me money and frustration. The camera is a D600 and I enjoy very much it's range "wide open" with the primes. The zoom was purchased primarily for the reach ... I am trying to train myself to not become addicted to convenience of them. Thanks again.
well I just got the 70-200 via UPS. the last thing i want to do is add a TCnow that i realise how heavy this thing is.
on the flip side, i realise that as the 7100 is a DX i have the crop factor of 1.4, which makes this thing a focal equivalent of a 280. the crop mode of the 7100 is another factor of 1.3 IIRC, so in thory i should have a lens equivalent in the 350-360 range, correct?
I have used the 70-200/2.8 VR1 quite extensively with the 1.7 TC but have no experience with the 2.0 TC. To get acceptable IQ with the 1.7 TC, one has to stop down from f/4.8 to at least f/5.6. It is also advisable to zoom not beyond about 190 mm. If you are using a high resolution camera, you might do better by cropping than by using a TC. With the D800, I have all but given up using the 70-200 with a TC, you lose the fast AF and the f/2.8 aperture.
You should also take into account that all the converters do not have VR,I personally only use a 1·4 on my 300 f2·8, the 1·7 was the main converter I use on the 70-200f2·8, handheld, but you do need good light for the focus to be quick.