Looking for a 2x TC for my 400/5.6 ED-IF AIS. It handles a 1.4XTC (TC14B) quite well, but was wondering if I would be better off modifying my TC20EIII (remove the tab) or getting a TC301.
Anyone used both of these on the 400/5.6?
I'd like to know before filing off the tab of the 20EIII.
Also, I have the 14EII, would that one be worth filing off the tab to use instead of the TC14B?
John, are the mounting rings the same layout on the TC14B and the TC20EIII. Can you swap them over and try the TC20 without filing it's tab? Same goes for the TC14EII. I've done this between the TC-14EII, TC-17EII, and TC20E(II and III) to try them out on lenses without filing any more tabs.
Not questioning your intent, just a heads-up.
The AiS 400mm need f8 to produce great results on a D7000.
Adding a 2x TC gets you into f16 diffraction territory.
AndreasE wrote:
Not questioning your intent, just a heads-up.
The AiS 400mm need f8 to produce great results on a D7000.
Adding a 2x TC gets you into f16 diffraction territory.
I've used my 400/5.6 AIS with the TC14B quite well on my D300, but now I have a D700 (not a D7K) that gives quite excellent images wide open and with the TC14B, so I was just seeing how far I can push things when I need extra reach. If my TC20EIII does better than a TC301, then that might be an acceptable answer. It the TC301 does better than the TC20EIII with this lens, then I'd have to lay out some $$ to get a TC301.
AndreasE wrote:
Not questioning your intent, just a heads-up.
The AiS 400mm need f8 to produce great results on a D7000.
Adding a 2x TC gets you into f16 diffraction territory.
Thinking out loud and a little OT. As you stop down a lens the edges of the diaphragm blades disperser light and because it is stopped down that dispersed light represents a greater proportion of the light getting through to the sensor. The dispersed light negatively impacts image quality. However, a TC does not have diaphragm blades and does not physically change the diaphragm opening. Is the effective f/8 that one achieves with a TC + lens the same as f/8 from a physical aperture change? I know the angle of light will change with the TC, but is it really the same, i.e., have the same affect on image sharpness?
I've used my 400/5.6 AIS with the TC14B quite well on my D300, but now I have a D700 (not a D7K) that gives quite excellent images wide open and with the TC14B, so I was just seeing how far I can push things when I need extra reach. If my TC20EIII does better than a TC301, then that might be an acceptable answer. It the TC301 does better than the TC20EIII with this lens, then I'd have to lay out some $$ to get a TC301.
John
You could just get a used Kenko 2x TC which should work on MF glass also.
galenapass wrote:
Thinking out loud and a little OT. As you stop down a lens the edges of the diaphragm blades disperser light and because it is stopped down that dispersed light represents a greater proportion of the light getting through to the sensor. The dispersed light negatively impacts image quality. However, a TC does not have diaphragm blades and does not physically change the diaphragm opening. Is the effective f/8 that one achieves with a TC + lens the same as f/8 from a physical aperture change? I know the angle of light will change with the TC, but is it really the same, i.e., have the same affect on image sharpness?...Show more →
I think the responses to your questions is yes, you are correct.
I have experimented with the new TC20EIII + the old 800mm f/5.6 EDIF AIS, and at two stops (f/11 = f22 with TC) I have the best sharpness with no diffraction at f/22 (in fact f11).
New TC20EIII on an old Nikkor 800mm f/5.6 AI-S EDIF.
D300, ISO 200, 1/50s at f/22(=11), tripod, MLU during 20 s, cable release.
Spot metering, -0.33 EV.
As the 800mm is a f/5.6 lens like the 400mm, perhaps the results would be similar, but only experiemnt shots can confirm or not that.
I have had a chance to use my TC20EIII with my 80-200/2.8 AFS and compare it to my 400/5.6 ED-IF AIS and I found the prime to be significantly better than the 2X TC + zoom at any distance and aperture.
Wanting to know if my new TC was at fault this morning I stopped by the place where I bought the TC and used my TC20EIII with a new 70-200/2.8 AFS VRII and my 80-200AFS.
The TC20EIII + 70-200 VRII was way better than my 80-200AFS with the same TC, so the TC seems to be working fine (I was impressed with the results with the new zoom).
I had read reports that the 80-200AFS did not pair well with the TC20EIII and this confirmed this. When I use the TC14E with my 80-200AFS I think the results are excellent.
One of the reasons I got the TC20EIII was to use it with my 80-200AFS as well as with 400/5.6 ED-IF AIS, now I will have to rethink things before filing off the tab.
I may suck it up and replace my beloved 80-200AFS with a 70-200AFS VRII (ouch!).
BTW - I am having a 400/5.6 ED (non-IF) delivered tomorrow from KEH and we'll be able to compare the IF and non-IF versions directly.
I'll report back on what I do with the TC and the 400/5.6 ED (IF or not).
