vivek iyer Posted June 28, 2005 Share Posted June 28, 2005 It is hard to find user experience/information on these. A unique auto focus 1.6X teleconverter from Nikon. Any user experiences, performance (optics, in particular), comparisons with other TCs will be much appreciated. TIA Vivek. Link to comment Share on other sites More sharing options...
ilkka_nissila Posted June 28, 2005 Share Posted June 28, 2005 It has a poor reputation. I haven't used it but I have never seen positive comments on its optical quality. Link to comment Share on other sites More sharing options...
User_1172872 Posted June 28, 2005 Share Posted June 28, 2005 It will not autofocus on all bodies; for example it was not activated by the N70 or F100. Worked fine on an N8008s and a N90s. I believe it won't function on any body the requires the aperture to be set on the body - it's lacking the second tab that convinces the body the lens is set to minimum aperture. Said to work only on lenses f3.5 or faster, mine works just fine with the [first version] 300mm f/4.0, and it worked fine on an even older 300 f/4.5! Generally center sharpness is very good but with some lenses (the 300 especially) the corners suffer and are a lot darker. Very limited autofocus range with a 300 tele. Mechanically excellent - unlike the Nikon TC 200 or 300 the front flange is identical to the one used on the camera body, and the combination is more rigid than any other TC (Kenko, Tamron, Sigma, TC 200 and 300) I have tried. Optically better than the [old, not "pro"] 1.5X Kenko I tried, and much better construction. Depending on condition, they seem to turn up at KEH for $ 60 to $ 90 regularly. On the other hand the current Sigma 1.4X "EX" version [cant' be used on all lenses due to the protruding front element] offers slightly less magnification but much more even illumination across the field with the 300 f/4.0.Hope this helps. Link to comment Share on other sites More sharing options...
john_n._wall Posted June 29, 2005 Share Posted June 29, 2005 The TC-16A is an outstanding TC but IF (and only IF) you understand how it works and why it was constructed. It is a bit more complicated to use than other AF TCs because of how it works. I do not have one now (switched to the KENKO Pro TCs which are great, esp. the 1.4x), but I found the one I had worked splendidly -- optically it was excellent (no reservations there) and mechanically it was a Nikon. The TC 16A was build in the early days of AF for Nikon to add AF capability to MF lenses; Nikon used this TC to encourage shooters to invest in Nikon AF bodies even when they had big investments in MF lenses. They stopped making it when they built up their AF lens range and no longer expected that new AF body buyers had a bag full of MF lenses. It provides 1.6x magnification. It also provides AF capability. This is provided by a moveable element in the TC itself, so it is limited by the range of movement in that element. AF capability varies from lens to lens, but in a set pattern. The wider the lens the greater the AF capability; the longer the lens, the less AF capability. I do not remember the specific details, but I think I remember that with a 35 mm lens (and wider), you can get full range AF capability, from close focus to infinity. As you use lenses longer than 35 mm, the range of the AF capability declines. What this means is, you need to understand how to use this TC with a telephoto lens to get full benefit from it. With a tele lens, you focus manually with the lens to approximate focus, then touch the shutter button (as with any AF lens) and the TC 16A will bring your lens into sharp focus. You watch the electronic rangefinder and bingo, the light turns green. There is of course some light loss (about 1 stop) as with any TC. You can use the TC 16A with an AF lens, but the AF lens becomes an MF lens; in other words, the only AF getting done will be done by the TC with this set-up. I think this TC is a bargain Nikon item, given its optical quality and compatibility with Nikkor glass. You get at least some AF capability with this TC without paying the vast sums required to buy Nikon's AF TCs and the lenses that go with them. You also get to use a piece of arcane Nikon history. PS do not confuse this TC with the TC 16, which was a TC designed, if memory serves, to be used with the short-lived F3 AF model. Link to comment Share on other sites More sharing options...
david_h._hartman Posted June 29, 2005 Share Posted June 29, 2005 The reputation of the TC-16A is sharp in the corner and softat the edges. I found it better than cropping TX with my 300/4.5ED-IF even though that lens is not noted as a good lens for usewith TC(s). The contrast did seem off some. <br><br>You can use the TC-16A on manual focus cameras by setting theoptical group to the infinity position. In this way the TC-16Aworks just fine with a Nikon FE2 or FM2n.<br><br>Ive done limited tests of the TC-16A with a 400/5.6 ED AIon the D2H. There is CA that needs cleaning up with Panorama,Correct. This setup gives one a 640/9.0 lens. The cropfactor makes it handle like a 990/9.0 lens so its apain to use and requires a heavy tripod.<br><br>The TC-16A is similar to a TC-14A (as I understand). Since a DXcamera only uses the center of the image the TC-16A may be wortha second look. I really do not know as yet.<br><br>Regards,<br><br>Dave Hartman.<br><br>---<br><br>When looking for CA in a lens on my D2H I look at 200% and 400%but if its not noticeable at 100% I dont consider ita problem. On charts I often see color moir頡t the smallestpartly resolved chart. When testing lenses on Tech Pan as acontinuous tone film I used to see astigmatism at the limit ofresolution. All lenses have aberration so at some level ofinspection youll find everything provided your test arestringent enough. If these aberrations do not effect your imagesas you use them then it doesnt matter. If they do then itdoes.<br><br>In the case of the 400/5.6 on the TC-16A and with a 20/2.8 AIS (onits own) I see some image sharpening as well as reduction orcorrection of CA when using Panorama Correct. The images arequite useable once corrected but it would be a pain to have tocorrect a large group of images as in events photography.<br><br>Im seeing very clean images with my 55/2.8 Micro, 85/2.0,105/2.5 and 135/2.8 (all AIS, the 135/2.8 has Super IC). CAproblems are most common with wide angle lenses on the D2H. Thisisnt a manual focus v. auto focus problem as the AF 20/2.8Dhas the same optical formula as the 20/2.8 AIS. Its a lensby lens issue. Digital isnt a panacea. We trade grain forCA and to a lessor extent noise. <br><br>Any events photographer should just go out an buy a lens like theAF-S 17~55/2.8G ED-IF. Its a boring zoom range but veryuseful. Its a bread and butter lens. I wish I had one. Ialso wish I owned a AF-S 28~70/2.8D ED-IF for film. The onlyreason to buy these lenses is the fine image quality. Link to comment Share on other sites More sharing options...
vivek iyer Posted June 29, 2005 Author Share Posted June 29, 2005 Thanks for your user experiences folks! I wonder why Nikon does not offer an AF/VR Teleconverter now? Should be possible (and hence will eliminate most problems of producing long lenses with VR) and easier to incorporate VR is a TC. --------------------------- David, On the CA issue with digicams- yes, it is a lens specific thing. I find the following lenses with no CA (or very little CA) on my D70: 16mm f/3.5, 20mm f/3.5 (AIS), 25-50mm f/4, 50-135mm f/3.5, 75-150mm f/3.5, 50-300 f/4.5 (up to 280 or so) ED, 105mm f/4 Micronikkor. 200mm f/3.5 ED Nikkor- almost neglible CA (bluish), unlike the 180mm f/2.8 ED. Regards, Vivek. Link to comment Share on other sites More sharing options...
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