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11-02-2016, 06:26 PM   #1
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Pentax 24-70 verus Tamron 24-70?

I have been trying to find any comparisons for the tamron and pentax 24-70, and more specifically on the k1, as from i am told they are the basically the same.

Is anyone using the tamron instead of the pentax and is there much of a difference image quality wise. If it helps my focus is on portraits and full length fashion. Tamron also seems to be either very good or not so good, from what i hear

Thanks

11-02-2016, 06:38 PM   #2
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They may be the same, but Tamron doesn't make the 24-70 f2.8 in a k mount, only the 28-75 f2.8 which by all accounts has somewhat weaker borders and isn't quite as sharp.
11-02-2016, 06:47 PM   #3
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oh ok that's interesting thanks, ill take a look
11-04-2016, 03:25 AM - 1 Like   #4
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QuoteOriginally posted by Rondec Quote
They may be the same, but Tamron doesn't make the 24-70 f2.8 in a k mount, only the 28-75 f2.8 which by all accounts has somewhat weaker borders and isn't quite as sharp.
According to all of the accounts I have read the weaker borders and lack of sharpness of the 28-75 are when wide open and disappear by f5.6. Although my experience with the lens on my K-1 is not yet extensive it does agree with the reports, f8 & f11 on a tripod being sharp.

11-04-2016, 03:37 AM   #5
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Maybe so, but the 28-75 is far from terrible wide open and for portraits a touch of softness on the corners is no big deal, even desirable. To outweigh that downside, the upside is that you can afford a few other lenses with the price difference.
11-04-2016, 05:37 AM - 1 Like   #6
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QuoteOriginally posted by wanderer2 Quote
According to all of the accounts I have read the weaker borders and lack of sharpness of the 28-75 are when wide open and disappear by f5.6. Although my experience with the lens on my K-1 is not yet extensive it does agree with the reports, f8 & f11 on a tripod being sharp.
My point wasn't that the Tamron 28-75 was bad, but that there are small differences (focal lengths available, border sharpness, screw drive vs SDM) that may separate them. There are plenty of folks who are pretty happy with the 28-75 and the biggest reason to go with the 24-70 is the fact that it goes to 24mm, which is awfully handy in some situations.
11-04-2016, 05:19 PM - 2 Likes   #7
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The Tamron 24-70 works great. I am sure the Pentax 24-70 does, too.

Tamron 24-70 + Canon EOS3 + Ektar 100 film.
11-05-2016, 03:51 AM   #8
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love the shot!

11-05-2016, 05:53 AM   #9
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QuoteOriginally posted by victormeldrew Quote
Maybe so, but the 28-75 is far from terrible wide open and for portraits a touch of softness on the corners is no big deal, even desirable. To outweigh that downside, the upside is that you can afford a few other lenses with the price difference.
+1 The obsession of corner sharpness at f/2.8... Well I don't think that it mater that much. The real difference for me is that 28-75 is small/light/innexpensive and that the 24-70 start at 24mm instead of 28mm. More than a few time, you may find 24mm handy.

I also can only guess that the DFA24-70 has better AF but I only can suspect here.

You may be better with the tamron. I know that personally instead I try FA20, FA31, FA77, but each to its own And I can't say this would be affordable!
01-01-2017, 12:48 AM   #10
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QuoteOriginally posted by Rondec Quote
They may be the same, but Tamron doesn't make the 24-70 f2.8 in a k mount, only the 28-75 f2.8 which by all accounts has somewhat weaker borders and isn't quite as sharp.
QuoteOriginally posted by wanderer2 Quote
According to all of the accounts I have read the weaker borders and lack of sharpness of the 28-75 are when wide open and disappear by f5.6. Although my experience with the lens on my K-1 is not yet extensive it does agree with the reports, f8 & f11 on a tripod being sharp.
QuoteOriginally posted by victormeldrew Quote
Maybe so, but the 28-75 is far from terrible wide open and for portraits a touch of softness on the corners is no big deal, even desirable. To outweigh that downside, the upside is that you can afford a few other lenses with the price difference.
QuoteOriginally posted by Rondec Quote
My point wasn't that the Tamron 28-75 was bad, but that there are small differences (focal lengths available, border sharpness, screw drive vs SDM) that may separate them. There are plenty of folks who are pretty happy with the 28-75 and the biggest reason to go with the 24-70 is the fact that it goes to 24mm, which is awfully handy in some situations.
I've been using the 28-75 f/2.8 for about a year on my Pentax APS-C cameras, and just recently picked up an A-mount version in the clearance sales to use on my full-frame gear.

When played to its strengths it's a fine lens, capable of fantastic results. So long as AF accuracy is tested and AF fine adjustment carried out as necessary, it's sharp enough in the center even wide open but really picks up by f/4. The full-frame format exposes its limitations (resolution and vignetting) in the borders & corners at wider apertures, but stopping down improves things (as you'd expect), with the best all-round performance on both my copies at around f/5.6.

I have a Sony Zeiss 24-70 f/2.8 in A-mount... without a doubt the best performing lens I own. The Tamron can't compete optically when pixel-peeping, and the focal length range is a little more limiting... But, as with Pentax's 24-70, the Zeiss is big and heavy. Often, I just don't want to carry it around for an entire morning or afternoon, especially if photography isn't the sole reason for venturing out. The Tamron is so small and light by comparison, and - whatever limitations it may have - it produces very pleasing images. However much I may love that Zeiss lens, I can guarantee the Tamron will spend more time on the camera this coming year.

EDIT: The K-mount copy I bought a while back could not be properly adjusted for AF accuracy within the camera's +/-10 range (and my experience with two other Tamron K-mount lenses has been the same). I sent it in for warranty service - after which it is perfect, requiring -4 adjustment on both my K-3 and K-3II. I'm quite certain that some of those unhappy with the lens wide open need to have their copies serviced. My A-mount version required only minor in-camera adjustment straight from the factory.

Last edited by BigMackCam; 01-01-2017 at 01:21 AM.
01-01-2017, 01:22 AM   #11
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QuoteOriginally posted by yozza Quote
i am told they are the basically the same.
They are basically identical, I have tested copies in canon EF and Nikon F mount - in comparison to the SMC-DFA version from pentax is very similar. With many f/2.8 zoom lenses the 24-70 mm f/2..8 isn't going to be anywhere near as sharp as a prime, so if you intend on using this lens at f/2.8 you might be better served by a portrait prime like the FA77 or a second hand FA*85mm f/1.4.
01-04-2017, 11:45 AM   #12
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Pentax 24-70 turns all rings Pentax wise - Tamron version the other way.
Pentax lens says Pentax on it, so you have to deal with only one customer service in case camera and lens are not working together that well. Besides that the Pentax is closer to Pentax design. As the Tamron is not available for Pentax, you don't really have a choice.
For portraiture wait for the expected new FF lenses from Pentax' road map. FA 77 and FA 85 are not really the latest kids on the block.
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