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70-300/5.6G VR and extension question


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#1 Woodturner

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Posted 16 January 2011 - 07:31 PM

Here is my list of the stuff I am using........ D90 Tamron 2x AFd teleconverter 70-300 VR My question is, do they work well together? I put it all together and I can't get a clear shot. I was trying to shot the moon the other night and the body kept clicking like it can't focus. I don't seem to have this problem with my D50. Could it be the settings? Or is it me? Full moon coming up soon and would like to figure this out. Thanks, Laurie

#2 james23p

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Posted 17 January 2011 - 12:43 AM

No its not you a 5.6 lens will not AF properly if at all with a 2x teleconverter. My Nikkor 70-300G f4-5.6 VR will AF in good light with my Kenko 1.4x TC but as soon as the light starts to fade it will hunt and give up, with a 2x Manual Focus will be your only reliable option. Most 2x converters are designed to AF with f2.8 lens and 1.4x TC are designed to AF with f2.8 and f4 lens. Most modern DSLR's and SLR's AF systems require around f5.6 or better to AF, a 1.4x TC will add 1 stop and a 2x TC will add 2 stops so as you can see you will be way above the AF's ability to AF with a 2x TC on a 5.6 lens. Jim

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F100 w MB-15, N80, FM3a, FE2(Black and Silver) and EM.

Nikkor 24-85G ED AF-S VR, 70-300G ED AF-S VR, 28-105 3.5-4.5 AF-D, 50 1.8 AF-D

Nikon Series E lens, 28mm, 100mm, 135mm, 75-150mm, 70-210 f4.

MF Nikkor's 50 f2 Ai, 500 f4 ED Ai-P.

 

MF Rokinon 14mm f2.8 ED AE UMC(Ai-P)

MF Rokinon 85mm f1.4 ASP AE UMC(Ai-P)

 



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#3 JSwarce

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Posted 17 January 2011 - 08:15 AM

Good explaination, Jim. I find it odd that Laurie says she did not have that problem with her D50. Seems to me that it wouldn't matter what body she uses. The results with the lens/tc combo should be the same. Maybe she will chime in here and let us know. On a side (related) note, I have a Tamron 180mm f/3.5 macro lens. Would that benefit from the use of a teleconverter for wildlife shots? If I am losing a stop of light with a 1.4x tc, what is effective f/stop for that lens then? And for a 2x tc? I assume I would have to manually focus if I used a 2x tc... --John

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#4 james23p

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Posted 17 January 2011 - 09:58 AM

Good explaination, Jim. I find it odd that Laurie says she did not have that problem with her D50. Seems to me that it wouldn't matter what body she uses. The results with the lens/tc combo should be the same. Maybe she will chime in here and let us know.

On a side (related) note, I have a Tamron 180mm f/3.5 macro lens. Would that benefit from the use of a teleconverter for wildlife shots? If I am losing a stop of light with a 1.4x tc, what is effective f/stop for that lens then? And for a 2x tc? I assume I would have to manually focus if I used a 2x tc...

--John


I believe you would have an effective f stop of f5 with a 1.4TC and around a f7 with a 2x TC. With a f3.5 lens you maybe able to AF in good light with a 2x TC maybe, but MF would probably be more effective.

Jim

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Nikon P900 Nikon P330

F100 w MB-15, N80, FM3a, FE2(Black and Silver) and EM.

Nikkor 24-85G ED AF-S VR, 70-300G ED AF-S VR, 28-105 3.5-4.5 AF-D, 50 1.8 AF-D

Nikon Series E lens, 28mm, 100mm, 135mm, 75-150mm, 70-210 f4.

MF Nikkor's 50 f2 Ai, 500 f4 ED Ai-P.

 

MF Rokinon 14mm f2.8 ED AE UMC(Ai-P)

MF Rokinon 85mm f1.4 ASP AE UMC(Ai-P)

 



Pro Manfrotto 055XV with Markins M10 ,Sirui P-326 6-Section Carbon Fiber Monopod with Markins Q3 Emille, Manfrotto Compact MKC3-H01M with Combo Head, 3Pod PTT1H Table Top Tripod with Giottos MH1304 Ballhead.


#5 Woodturner

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Posted 17 January 2011 - 12:17 PM

Thanks for your replies, Jim, I think that where my other setup work is because I have another 70/300 that's not a VR with a smaller f stop but always had vibration problems. So I purchased a VR. I will try it manually and see what happen. Thank again for your help. You Planet people are great! :rolleyes: Laurie




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