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03-25-2019, 05:51 AM   #1
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Tamron 70-200 2.8 and kenkoo teleconverter

Hi all,
I just purchased a TAMRON 70-200 f2.8 DI LD (ID) MACRO to shoot theater dance with my K-5 II.
Since I'm planning a safari trip this summer, I would like to know if this lens works properly with kenkoo 2x teleconverter. I've read it works somewhere over the Web, and that would maybe avoid me buying a longer lens for the safari..

Cheers






03-25-2019, 07:11 AM   #2
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Which Kenko 2x teleconverter, there are about a dozen models?
03-25-2019, 08:50 AM   #3
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QuoteOriginally posted by Docrwm Quote
Which Kenko 2x teleconverter, there are about a dozen models?


Exactly! You'll need to be sure the teleconverter you use has the appropriate autofocus connection for your lens/camera, either screw-drive or the power connections for a motorised lens (aka power-zoom connections). Failing this connectivity you'll be limited to manual focus. This all assumes the teleconverter has the auto-aperture contacts, else you'll be limited to manual exposure as well


Good luck!
03-25-2019, 11:37 AM   #4
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QuoteOriginally posted by Docrwm Quote
Which Kenko 2x teleconverter, there are about a dozen models?


Well, this is my question...which model should I use in order to get autofocus (screwdrive) and aperture connections between camera-tc-lens?

I don't own any Tc yet




03-25-2019, 11:46 AM   #5
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QuoteOriginally posted by marcob8986 Quote
Well, this is my question...which model should I use in order to get autofocus (screwdrive) and aperture connections between camera-tc-lens?

I don't own any Tc yet

Here is the link to the reviews of TC's here on the site. Most have good write ups with details about what they do and whether they have what you want.
Miscellaneous Lenses for Pentax: Teleconverters (All Brands) - Pentax Lens Review Database
03-25-2019, 01:26 PM   #6
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For info, according to LensTip, the Tamron 70-200 tests very well optically with a 1.4 TC (teleconverter), better than some other 70-200's. It seems to do very well even with a Sigma TC, so that one might be a good one to hunt down in K-mount (if one exists).

Tamron SP AF 70-200 mm f/2.8 Di LD (IF) MACRO review - Image resolution - LensTip.com
03-25-2019, 04:21 PM   #7
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QuoteOriginally posted by rawr Quote
For info, according to LensTip, the Tamron 70-200 tests very well optically with a 1.4 TC (teleconverter), better than some other 70-200's. It seems to do very well even with a Sigma TC, so that one might be a good one to hunt down in K-mount (if one exists).

Do be aware that the Sigma EX 2x teleconverter in PK mount, although it would seem to fit most, if not all of the OP's requirements, is designed for use with specific Sigma lenses. On many other lenses, including some later Sigma lenses, it simply will not fit (the optics get in the way!) or if it does it may not lock into position ... I've got one, bought for use with a Sigma 70-200 f/2.8 EX, which it is fine with, but it won't lock onto my Sigma 150-500mm and simply won't fit at all with a selection of other Tamron and Pentax autofocus lenses!


The OP may also care to consider that, with older teleconverters, there is no way for the camera to know that the focal length of the lens has changed, so a 70-200mm f/2.8 still presents itself to the camera as just that, so the Shake Reduction feature may not be as effective as one might expect.
03-25-2019, 08:05 PM   #8
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QuoteOriginally posted by kypfer Quote
and simply won't fit at all with a selection of other Tamron and Pentax autofocus lenses!
Always a risk, esp with 2X teleconverters, it seems. I only have one 2X TC - the Pentax REAR CONVERTER-A 2X-S - and it is also fussy about what it will work with (although obviously not as fussy as the A1.4X-L or A2X-L).

Converter / AF Lens Adapter / K-mount Lenses / Lenses / Products | RICOH IMAGING

A problem I should mention about pairing the Tamron 70-200 with the Sigma 1.4 TC that Lenstip says works great with the lens is that there seems to be 3 versions of that Sigma TC available of various vintages. It's not clear which version Lenstip used.

04-02-2019, 09:42 PM - 1 Like   #9
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I've used the Tamron-F 1.4X Pz-AF MC4 with both the AF Tamron 70-200mm F2.8 Di LD Macro and the Tamron Adaptall-2 SP 80-200mm f2.8 LD BBAR MC (30A) for many years with complete satisfaction.

That combination, especially when combined with the crop-ability of high mega-pixel sensors, produces notably better results than any of the 2x TC's (such as the Tamron Adaptall 2x teleconverter 01F or Tamron Adaptall 200F SP TC 2X ) for me. The 200F offers no special advantage for telephoto use as it's optimized for flat-field close-up use.

The Kenko (?Promaster et al..) AF/Pz-AF 1.4x/1.5x Teleplus.... is the optical equivalent of the Tamron 1.4X.


For practical use the Tamron 70-200 plus 1.4x TC produces similar results to my DA* 300 and is typically more versatile in the field as well.
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