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12-04-2009, 03:59 AM   #1
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The Tamron 17-50mm and 28-75mm questions

The Tamron 28-75 is full frame compatible while the 17-50 is optimized for digital, correct? Also does the 28-75 have the loose barrel problems found in the 17-50?

12-04-2009, 04:59 AM   #2
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Don't know enough about the FF issues, but the 28-75 is reasonably well built. Having said that, the barrel on my copy does jiggle a little, but I tend not to taunt the lens with lots of playing around on the barrel...

Tamrons whilst great in IQ aren't a robust breed of lenses IMO. I'd say they're on par with the DAs but as expected, nothing like the DA*s or limiteds.
12-04-2009, 10:58 AM   #3
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Yes, the 17-50 is optimized for the crop sensor. I take my 17-50mm, which I have shot with for over a year & a half, to the Presidential Mt range for hikes--some of the worst weather known. It has not failed me. I find the build quality more than adequate, & carry this lens in a regular hiking bag all over the East coast. I do not have time to baby my equipment--I love to hike and shoot, shoot, shoot. Here is a shot with hte 17-50mm:

Last edited by Jewelltrail; 01-31-2010 at 10:54 PM.
12-04-2009, 11:18 AM   #4
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The quick guide with Tamron is that "Di-II" models are not-full frame, while "Di" models are full-frame.

My 17-50 does not exhibit loose barrel issues, but the lens (front glass) has fallen out once mysteriously. I reassembled it with no noticeable problems. My 18-250 lens barrel gets jiggy with it though.

12-05-2009, 11:58 AM   #5
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Found a video on how to re-tighten the loose barrel problem on Youtube, http://www.youtube.com/watch?v=IiOj-7MAO_w

I'm kind of lost on what to buy right now whether it be the 28-75 or 17-50. It seems like I want to have the wider-end of the 17-50. The good thing about the 28-75 is it is also full frame compatible.

The Sigma 24-70 f/2.8 seems like a really good option right now for in-between the two. If anybody have any IQ tests links or anything between the 24-70 and it's competitors, I would love it. Thanks.
12-05-2009, 03:34 PM   #6
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The Sigma 24-70 is a lot bigger and heavier that either of the two Tamrons.

Sigma 24-70 F2.8 --> 82mm filter - 115 mm long - 715 grams

Tamron 17-50 F2.8 --> 67mm filter - 74 mm long - 434 grams

Tamron 28-75 F2.8 --> 67mm filter - 92mm long - 510 grams


Sigma - Lenses

Tamron AF 17-50mm f/2.8 SP XR Di II LD Aspherical [IF] (Nikon) - Review / Test Report

Tamron AF 28-75mm f/2.8 SP XR Di LD Aspherical (IF) (Nikon) - Review / Lab Test Report
12-05-2009, 03:52 PM   #7
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Yea but weight and size isn't really what I'm worried about, it's all about the IQ man... the IQ.
12-05-2009, 04:09 PM   #8
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I have both Tamrons. They're both great. If you shoot more landscapes then the 17-50 would be preferable If you should more portariat, then the 28-75 sould be preferable. For image quality I give the 28-75 a slight edge. I would not woryy about the loose barrel issue Neither one of mine has that problem. If they did have the problem, it would take only a minute to fix it, as shown on the uTube video clip.

12-05-2009, 04:39 PM   #9
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How does this lens go against sealing off dust? I heard they are a vaccuum cleaner.
12-05-2009, 05:03 PM   #10
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QuoteOriginally posted by LeDave Quote
How does this lens go against sealing off dust? I heard they are a vaccuum cleaner.
I haven't noticed any problems with dust on my 17-50 or 28-75. IMHO, just like the loose barrel issue, and any FF or BF issues with this lens, I think things can easily get blown out of proportion on the web. These are both outstanding lenses that offer a lot of bang for the buck. Good luck in your search.
12-05-2009, 05:41 PM   #11
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Why would the two Tamrons be any different than the Sigma. If anything, the Sigma's internal volume exapnds even more when it extends out. Think of the lenses as bicycle pumps. The bigger they are and the more they extend, the more volume of air is displaced.


QuoteOriginally posted by LeDave Quote
How does this lens go against sealing off dust? I heard they are a vaccuum cleaner.
12-05-2009, 07:04 PM   #12
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Both lenses, as stated, are excellent. I have the 28-70 in Canon mount, and I cannot tell the difference in IQ between the Tamron and the Canon 50 f/1.4 - really, truly. Low light would be the only reason - when I need a larger aperture. The build quality was a concern when I first bought it - and I was rough on it all the time, but it never has loosened up. Image quality has never suffered.

My brother has the 17-50 in Nikon mount - and it has a nice feel. My biggest concern with it is the field curvature problem which is well documented - so I am happy with the Pentax 16-45 which appears to be a bit more solid optically (with no major image weaknesses at any aperture or focal length) although it has somewhat unimpressive build quality (slight nod to the Tamron 17-50 in that regard). On digital especially, you really can't compare a zoom starting at 17 with another starting at 28.

The dust vacuum baloney is an urban myth. Roughly 98% of the dust that gets onto a sensor happens when you change lenses (think about it). Yes, you will change lenses if you have a 28-75 on a crop sensor. That lens is giving you nothing more than normal to portrait perspective on a crop sensor; of course, you have to do a lot of switching. But it will be your main lens because of the IQ. (Personally, I felt the lens was even better on FF - Canon 5D - because there really was no fall off in quality. You aren't getting its greatest virtues on the crop sensors - in my case the Canon 20D).
12-05-2009, 11:41 PM   #13
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I used to own the 17-50 and now have the 28-75. I made the switch because the 17-50 isn't suitable for shooting 135 film. Both are solid performers. I used the 28-75 all day today on a help-portrait shoot and am thrilled with the results.

My 17-50 did develop the loose filter ring problem and I sent it in under warranty to Tamron USA. They turned it around 14 days door-to-door and it came back in as good or better condition than when I first took it out of the factory box.
12-06-2009, 12:17 AM   #14
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QuoteOriginally posted by Venturi Quote
I used the 28-75 all day today on a help-portrait shoot and am thrilled with the results.
Was that a trial?
The real thing is on the 12/12/09. We are going to do it in Wellington as well.

How does the lens perform wide open? I like using f/2.8 on the FA 50/1.4 for portraits and it is nice and sharp at that aperture. I wonder how a zoom does wide open. Normally I wouldn't expect much but I have heard nothing but praise for this lens. Regarding IQ, that is. Regarding build quality, Peter Zack wasn't impressed with it.
12-06-2009, 11:30 PM   #15
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As I said before, the Tamron 28-70 is very durable even if the build is a little loose even initially.

My IQ experience (both FF and crop sensor) has been that the lens performs extremely well at f/4 and smaller throughout the range. It is soft wide open, the kind of soft that works fine for portraits. I have never seen a lens improve so much stopped a single stop - that is to say f/4 is very sharp.
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