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TC Guide II 200/2.8 + 1.4X 1.7X 2X Tests

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Miranda F View Drop Down
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Joined: 11 January 2014
Country: United Kingdom
Location: Bristol
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Post Options Post Options   Quote Miranda F Quote  Post ReplyReply Direct Link To This Post Posted: 26 January 2014 at 21:04
Originally posted by jrfarrar jrfarrar wrote:

Clearly the matched converter outperformed but I was surprised how much difference in color between them.

Yes, it's not just about resolution, is it?

I've tried quite a few TCs over the years and mostly found them a great disappointment for slide or colour print film - especially with zoom lenses - not merely for the reduction in resolution which could be more or less obvious, but for the loss in contrast which on a dull day would kill the picture entirely. So I basically stopped using TCs and wouldn't consider mating one with a zoom.

But I did some tests the other day to see how well my old 400mm Soligor compared to (A) the Tamron 80-210 (at 200mm) plus TC and (B) the cheap Sony 55-200mm zoom plus clearview zoom, chiefly to see which gave the best resolution & contrast. Sure, none of the lenses are top-grade.

But the TC was the tamron 2x SP 6-element converter (though in adaptall mount) and I was very surprised how good the results were on the tamron zoom lens. I guess part of the reason is the quality of the TC, but I'm wondering if the fact that they were both Tamron and well-matched helped. In the tests I did the IQ appeared to be hardly degraded at all compared with the 80-210 on its own, even at full aperture.

Miranda F & Sensorex, Sony A7Rii, A58, Nex-6, Dynax 4, 5, 60, 500si/600si/700si/800si, various Sony & Minolta lenses, several Tamrons, lots of MF primes and *far* too many old film cameras ...

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Kaishi View Drop Down
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Joined: 28 December 2007
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Post Options Post Options   Quote Kaishi Quote  Post ReplyReply Direct Link To This Post Posted: 29 December 2014 at 23:00
Could someone with a Sony or Minolta G/APO teleconverter measure the width clearance on the lens-mating side?

I ask because I have the suspicion that the Tamron SP 150-600mm USM will work with it, at least dimensionally. Electronically is a whole different question.

Thanks in advance :)
α900/VG, α77ii/VG, A7rII/VG, AF 28-70 F2.8 G, 16-50 F2.8 SSM, Σ 105 F2.8 EX DG OS HSM MACRO, SP 150-600 F5-6.3 Di USD;Gallery
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TomV View Drop Down

Joined: 29 September 2015
Country: United States
Location: Annapolis MD
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Post Options Post Options   Quote TomV Quote  Post ReplyReply Direct Link To This Post Posted: 29 September 2015 at 04:23
The lens surface on the Minolta 1.4X APO (I have versions I and II)is nearly flush to the housing flange. I would not use it on the Tamron unless the Tamron converter for the lens is of the same measurement. I just got myself a Kenko MC4 DGX 1.4X and its lens is much deeper than the Minolta.

The pictures about the teleconverters on this website are accurate. The Kenko is a Generic since the depth from lens to housing flange is about 8 mm. That should work for you. I also bought the Kenko because I read that it can autofocus with the Sony SAL70-400G. This I verified today. I cannot speak about the image quality yet but have not heard any negatives about it.
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