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05-05-2019, 11:04 PM   #1
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Pentax DA 1.4X TC with Tamron 70-200

Hi everyone,

I have the Tamron 70-200 and Ive been debating whether to buy the Pentax TC or not to extend my reach.
I dont know if I will benefit from the 280mm vs just cropping in PP, plus the DA TC is not exactly cheap (compared to other TC's), but it is the best you can get regarding quality.
I also have the DA 55-300 WR but not exactly the best in AF or image quality at 300mm.

Does anyone have any comparison photos with the above combo (Tammy + tc vs cropping), to help me decide?
Any input will be greatly appreciated.

Thanks

05-06-2019, 01:28 AM   #2
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I was also considering the same as I recently acquired my Tamron 70-200mm f/2.8. For me, I decided that I couldn't justify the price for the TC. I think for a bit more money I could get a longer lens which would likely give me better pictures if I found a good deal in second hand market. i.e. DA* 300mm
05-06-2019, 11:35 AM   #3
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I have both lenses
Pentax DA 1.4X TC does NOT work with the Sigma 70-200 mm
Works with the DA 55-300 PLM


Sorry I saw the Tamron and thought of Sigma

Last edited by Crooski; 05-06-2019 at 11:38 AM. Reason: Mistake
05-06-2019, 12:28 PM - 1 Like   #4
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It works fine with my Tamron 300 2.8, DA*200 and DA* 60-250, as well as the DFA 100 macro, the Tamron 90 macro, the Sigma 70 macro. I tried it but don't recommend it on the DA 55-300 PLM. Those are the lenses I've tried it on. It needs to be a DA* quality lens, consumer grade zooms are generally not sharp enough, but I'd be amazed if it didn't make your Tamron 70-200 280 sharp mm. The increased resolution according to Pentax engineers is -3% from the 40 % nominal. As long as your lens has extra resolution, and as far as I know the Tamron 70-200 is excellent, it should give you a 37% increase in subject resolution under perfect circumstances. The only thing that might disapoint you is that 280mm just isn't that long. You get a lot more from it on a 300mm lens.

From todays shooting.
Enough of the trying to get a K-1 to do what a K-3 does... back to what works. My life just got so much easier.
K-3
Tamron 300 2.8 with HD DA 1.4 TC. (420 mm ƒ4 [630mm FF equivalent])
ISO 200 ƒ8, AV mode
Dark eyed Junco


Hairy Woodpecker


Female purple finche.




Male Purple finch


Blue Jay


White Throated Sparrow


Red Breasted Nuthatch


But do wait until a user who has it comes on to tell you if they play nice together.


Last edited by normhead; 05-06-2019 at 06:06 PM.
05-06-2019, 10:31 PM   #5
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QuoteOriginally posted by normhead Quote
The only thing that might disapoint you is that 280mm just isn't that long. You get a lot more from it on a 300mm lens.
Thats my only worry too to be honest. I will wait a while until either I find a good bargain or I get to test one myself. Ive got a dragonboat race which I want to cover in a few weeks, I will see how the Tamron 70-200 performs on its own and check how the cropped pics look and decide if I really need the TC or not. I used the 55-300 WR 2 years ago, and I was definitely surprised by the amount of keepers, despite the slow AF. Im sure the Tammy will be in a totally different league.
Lovely pics by the way
05-07-2019, 05:59 AM   #6
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QuoteOriginally posted by schnitzer79 Quote
Thats my only worry too to be honest. I will wait a while until either I find a good bargain or I get to test one myself. Ive got a dragonboat race which I want to cover in a few weeks, I will see how the Tamron 70-200 performs on its own and check how the cropped pics look and decide if I really need the TC or not. I used the 55-300 WR 2 years ago, and I was definitely surprised by the amount of keepers, despite the slow AF. Im sure the Tammy will be in a totally different league.
Lovely pics by the way
Thanks, a picture is worth thousand words. Especially when trying to evaluate lenses.
05-09-2019, 05:24 PM   #7
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And with TC's.....

05-10-2019, 08:21 AM   #8
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has anyone tried the tammy 70-200 with the pentax 1.7x? im aware that the TC does the focusing but just wondering on how it performs
05-15-2019, 10:46 AM   #9
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You might want to consider the Tamron 1.4 TC MC4. I have one that I use with my Sigma 300. Haven't really tried it with my Tamron 70-200 F2.8, as I've been most happy with just cropping.

handheld, and cropped.

06-01-2019, 03:03 AM   #10
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ended up buying the pentax 1.7x AF and it arrived yesterday.
tested it with my MF A-50mm f1.4, samyang 85mm f1.4 and kiron 105mm f2.8 and works as it should.
checked it briefly with the tammy 70-200 and images look good through the camera screen. AF works great too.
quite pleased with my purchase.will post some photos soon
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