| Author: | | Pentaxian Registered: February, 2010 Location: Northern Michigan Posts: 6,173
5 users found this helpful
| | Review Date: May 5, 2014 | Recommended | Price: $365.00
| Rating: 9 |
| Pros: | Loads of microcontrast, fairly sharp, decent color rendition | | Cons: | SDM and other AF related horrors | | Sharpness: 9
Aberrations: 9
Bokeh: 8
Autofocus: 5
Handling: 8
Value: 7
New or Used: Used
Camera Used: Pentax K-5iis
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Optically, this is a very good standard zoom lens. For mid-aperture shooting, perhaps only the DA* 16-50 can beat it. The lens is fairly sharp and impressively contrasty. Color rendition is good, but not quite at the level of limited or star glass, or of the DA 12-24 and DA 10-17. It's color rendering is a tad on the warm side, closer to Pentax telephoto glass (like the DFA 100 macro and DA* 300) than Pentax wide angle glass.
It's very hard to make a zoom lens with a range as long as 17mm to 70mm consistently good, edge to edge, at all focal lengths. Pentax came close to achieving that standard in the DA 17-70. It's very good edge to edge throughout most of it's range. But it does give up some resolution at the long end. I haven't tested the lens extensively to discover exactly where resolution begins to tail off. It still seems pretty good at 50mm, and maybe at 60mm as well. But at 70mm it's not as good, particularly at longer distances, regardless of whether one stops down or not.
The main problem with the lens, and probably the reason why it's generally rating is, compared to other, optically inferior standard zoom lenses, is because of the SDM horrors associated with it, along with other AF issues that have plagued the lens. I've used two copies the lens. The first copy manifested extremely serious AF issues, resulting from the inability of the lens to report to the camera the correct focal length. Regardless of which focal length was actually used, the lens recorded the focal length as 43mm. This essentially incapacitated the AF at most focal lengths. The SDM worked worked in the sense that it was not the source of the problem; but the lens, confused because of the misreported focal length, floundered like a beached whale, moving with little purpose and even less efficacy. The replacement version, however, has worked without a flaw. It will be interesting to discover how long the SDM horror functions before its inevitably decline and death.
Some samples of the lens, sans recorded focal length:
 | | | | | | | Senior Member Registered: February, 2015 Posts: 175
3 users found this helpful
| | Review Date: January 14, 2017 | Recommended | Price: $250.00
| Rating: 8 |
| Pros: | sharpness, colour rendition, contrast, large aperture at 70 | | Cons: | focus ring too loose | | Sharpness: 9
Aberrations: 9
Bokeh: 9
Autofocus: 6
Handling: 7
Value: 8
New or Used: Used
Camera Used: K3 and K30
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I bought this lens in 2014, second hand from my son who had bought it bundled with K5 in 2011.
I never had trouble with the SDM.
IMO, the lens is sharp at all focal lengths but, wide open at f4, in the 50-70mm range, the depth of field is shallow and the AF needs some training, as the focus ring is too loose and any shake of the camera once focus is locked can move the focus.
Once you are used to it, you just be careful and then it is OK.
The AF is silent, fast and, on K3, doesnt hunt, even in very dim light. On K30, as the focus point are much wider and the AF software is less efficient, it may hunt in very dim light or when the camera doesnt know what to focus on (= busy background, interfering grass or twigs, or very low contrast target). I noticed the same difference in AF performance on most lenses.
The overall IQ, even fully open, is excellent for a zoom lens as regards sharpness, contrast, distorsion and colours.
F4 at the long end already allows some subject isolation, with a nice bokeh.
The 17-70 is a big lens, with much glass. Thus, when I need to go light and/or a more polyvalent lens with a longer focal range, when traveling for instance, I will use the DA 18-135, which is much more compact and lighter, is WR and has better AF performance.
I choose the 17-70 for landscapes and urban scenes when I know I wont need long telephoto, size and weight is not a problem, and I will have time to care about the AF. Also when looking for better IQ when shooting in low light, as the lens is good fully open, whereas my DA 18-135, though only 0,5 stop slower at the long end, needs to be stopped down to deliver a comparable IQ.
Of course the IQ of my primes is much better; DA21, DA35 macro, DA40 and DA70 are sharper; DA15 is wider and has an outstanding contrast and flare resistance, like DA21 and DA40; DA 35 macro, DA35 f2.4, DA40 XS and DA70, and even the fim era FA50 f1.7 are obviously sharper and brighter but the 17-70 delivers a very nice IQ with the convenience of a zoom.
Edit 18/11/2019:
- the main quality of this lens is the way it handles contrast and microcontrast: when compared to the lighter, more compact and more convenient DA18-135. DA 17-70 rendition is closer to what my DA limited prime lenses deliver. And of course DA17-70 is obviously sharper across the frame at the long end than the 18-135 at the same focal length.
- the main IQ issue with this lens is the loose focus ring and its very short travel, coupled with the Quickshift continuous manual focus override.
- but IMO the main limitation is its size and weight
| | | | | Inactive Account Registered: September, 2010 Location: Burley, Idaho Posts: 6
3 users found this helpful
| | Review Date: December 3, 2011 | Recommended | Price: $480.00
| Rating: 10 |
| Pros: | SHARP!!! Quiet with Good Range and Close Focus. | | Cons: | Focusing ring rotates | | Sharpness: 10
Aberrations: 10
Bokeh: 10
Autofocus: 10
Handling: 10
Value: 10
New or Used: New
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 I've been reading other reviews of this lens and I can't believe we're talking about the same lens. I think it's the best normal range zoom. I've used almost all the others, Pentax, Nikon, and Canon none were better. I've taken portraits and flower pictures at 70mm f4 and they are tack sharp. I've had one problem with the focus but that was after I stood in a blowing rain storm taking a picture of a mountain lake. I sent it to pentax and it came back better than new. I use this lens for about 85% of my pictures. I've been a professional photographer for over 40 years and I'm telling you this lens can do it all. I know Pentax has a 16-50mm f2.8 that a lot of people like and it is sharp but 50mm are you kidding? I owned a Canon 17-50mm f2.8 and I almost gave it away, too short for weddings and not all that sharp. I know the SDM gets a bad rap but other Pentax lenses have the SDM focusing like all the Star lenses. I have not tried the new 18-135mm yet. I do need a weather proof lens that is sharp. If the 17-70mm lens was wearher proof it would be perfect. Once again I'm telling you this lens is Sharp!!!!!!! See Later Comments about focus problems again, I'm not so smilely now. When it works it's great but......... | | | | | Veteran Member Registered: April, 2009 Location: port townsend, wa Posts: 968
3 users found this helpful
| | Review Date: February 14, 2011 | Recommended | Price: $469.00
| Rating: 10 |
| Pros: | Nice IQ, Nice zoom range | | Cons: | none | |
I was looking for a Pentax crop sensor equivalent of the full frame Canon 24-105 f4. Here it is. Like that popular lens, this has very nice image quality. Photos are sharp through the range, if the tiniest bit soft at 70mm. If contrast is slightly down at f4, that's easy to fix in post. For 99% of my uses it's more than simply good.
Some people knock it for being f4 and heavy. Well folks you bought an f4 lens, didn't you. Marking it down because it's not faster is pretty silly, isn't it? I'll guarantee you that it would be a lot more expensive and heavy at f2.8. My 50mm lens doesn't have much of a zoom range. Can I knock it for that? No, for what it is it's a 10, as this lens is for me. Rate the lens for what it is. I've also tried the Sigma 17-70 and it does go to f2.8 at the wide end. It just isn't as good a lens and 2.8 is simply too soft and flat to be appealing on it.
Anyway, now that that's out of my system, I can say that this is my new walk around lens. At all focal lengths it's sharper than my 18-250 and about the same weight. And the 18-250 is a step up from kit lenses at the same focal lengths. Contrast and color saturation are both better with the 17-70. Focusing is both faster and more accurate, as well as much quieter. Build quality is about the same as the 18-250, good but not superb. That's what I expect from Pentax with a non-* zoom lens. It's certainly feels more solid than the kit lenses I've used. I considered the 18-135. The weather sealing on that and the great zoom range are both appealing but after trying that out, it didn't have the same IQ, though its focusing was excellent.
| | | | | | | Pentaxian Registered: April, 2016 Location: Tirana Posts: 780
2 users found this helpful
| | Review Date: November 30, 2018 | Recommended
| Rating: 9 |
| Pros: | sharp, contrasty, colorful | | Cons: | AF over 50mm, focus ring range is too small | | Sharpness: 9
Aberrations: 9
Bokeh: 9
Autofocus: 7
Handling: 9
Value: 7
New or Used: Used
Camera Used: k-30
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I got this lens on a bargain, about 60 euros, from somebody that dindnt know(obviously) what it was worth. ever since i bought it, i have never put the kit 18-55 wr back on the camera, except for when its rainy, too bad this lens doesnt come with WR. I am fairly satisfied with the autofocus from 17-50mm and from 50-70mm it is a fingers crossed situation. what it catches the focus it does so precisely, but when it doesnt it just wont lock on it. you can try and get it yourself by using the focus ring but since the travel of the ring is only about 60 degrees you have to be precise to the 10th of the millimeter. Other than this this is the best rendering all purpose zoom i have had to date. Image quality feels professional. and the range is very useful. That 1 mm on the wide range is quite relevant differently from assumptions, and the 70mm is very good for portraits...when the focus does lock in, that is. Flare and CA on the optimal side.
| | | | | Forum Member Registered: June, 2012 Posts: 80
2 users found this helpful
| | Review Date: September 9, 2012 | Not Recommended | Price: $500.00
| Rating: 2 |
| Pros: | IQ "CAN" be excellent when stopped down a bit | | Cons: | AF accuracy - eventual failure | | Sharpness: 9
Aberrations: 9
Bokeh: 8
Autofocus: 3
Handling: 6
Value: 4
New or Used: New
Camera Used: Kx, K-5
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This COULD have been a great lens. Optically the 17-70 has the chops to be an excellent all-purpose wide zoom but it shows a clear "lack of focus" on the part of management at Pentax. At times I really like this lens. At other times I hate it.
UPDATE: I hate it. See below for reasons you should avoid it.
The Good...
1. This lens can turn in great wide shots at 17mm and is pretty good below 50mm when the AF is spot-on. As mentioned, toward 70 is gets softer but the change is not drastic. When it nails focus, it is quite sharp comparing well to some of my wide primes!
2. Nice saturated color from wide open.
3. Flare resistance. No problems with flare even without the hood!
4. No serious issues with CA or PF.
5. Not too heavy
6. Haven't had an SDM failure, yet. -- UPDATE: Of course I have. :-)
The Bad...
1. This lens can turn in out of focus shots at almost any focal length in almost any light. Between 50 and 70 in lower light it can sometimes lock focus so comically bad that the whole frame is simply a blur! At wide angles taking landscapes one must be very careful to check for critical focus after shooting lest the lens go past infinity and lose sharp focus everywhere. Acts the same on the K-x and K-5. Frankly for wide landscapes, use LV and pre-check focus or better yet carefully use MF. It can easily look good on the LCD only to show poor focus later on the computer. Infuriating!
2. The comically short focus throw with almost zero damping makes AF inaccurate IMO because they were trying so hard to give the weak SDM motor a shot at keeping up with the AF speed of the screw drive. Repeatability is also low. Take the identical shot of a clearly defined, unambiguous subject 10 times and get all sorts of variation. Your AF system is only as good as the AF positioning system in the lens you're using and this just doesn't cut it. The short focus throw also makes manual focus so touchy as to be almost useless.
3. The horrible KAF3 mount decision... While most SDM lenses have SDM and screwmount drive as a backup (KAF2) the 17-70 suffers with the cost-reduced KAF3. When the SDM goes, you're dead in the water. If this were KAF2 I would have covered the SDM contacts long ago. There was no excuse for this cost reduction on a $600 lens.
4. More evidence that Pentax didn't know how to position this lens? Partial weather sealing? Yeah there is a nice big weather seal on the mount but it's not a WR lens and apparently lacks the other water and dust seals. Huh???
5. SDM reliability -- There is a high chance that this lens will fail you and you'll be stuck with an expensive repair that may or may not be a long-term fix. IS IT WORTH IT?
The 17-70 would be a superb lens with a screw drive (or maybe the new DC drive) and a longer focus throw. Maybe a 17-70 mkII.
UPDATE: After another weekend outing with this thing I have to downgrade another point. Unless you chimp every wide shot with this thing... don't count on focused photos. Take multiple shots purposely throwing focus out in between shots to give the AF another try. This should NOT be necessary. My other lenses work quite well compared to this.
FINAL UPDATE: Jan 2014
More and more the lens simply sticks and refuses to focus at all until it gets some "exercise". This is the classic symptom for SDM failure which will cost $200+ to fix. Pentax did themselves a great disservice by being cowards and never coming clean about the SDM issue with their loyal customer base. Instead of supporting their product they lied and hid from a bad design hoping the problems would just go away. Now SDM lens customers must question if the design is actually fixed or if a lens sent for repair will be repaired with a fixed motor design or just another bad motor destined to fail. It's fairly clear that the new DC motor lenses are an answer to the high failure rates of the SDM's. One might ask why the new DC motor if SDM failure rates were within the acceptable range. Do yourself a favor, don't buy an SDM lens period.
| | | | | New Member Registered: April, 2010 Posts: 5
2 users found this helpful
| | Review Date: April 20, 2012 | Recommended | Price: $425.00
| Rating: 10 |
| Pros: | zoom range, decent IMQ, near silent AF | | Cons: | AF good Kr,K5 :( | | Sharpness: 10
Aberrations: 9
Bokeh: 9
Autofocus: 10
Handling: 9
Value: 10
New or Used: Used
Camera Used: Kr
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Before I used it with K10, K7. Very difficult to focus on 50-70
But is it really Kr is no longer effective in 50-70 hunt phenomenon. Perhaps because of K7 AF not as good as I Kr and previous reviews are probably 5 points for K7 but perhaps it is 10 pointswith Kr.
ALL IN ONE a lens from landscape, portrait ......
( Sorry about my english )
ảnh nguyên gốc JPG - resize
Em cu của Khánh_Zui, trên Flickr
Anh Phương của Khánh_Zui, trên Flickr
17-70 của Khánh_Zui, trên Flickr
Ngọc Béo của Khánh_Zui, trên Flickr
Food của Khánh_Zui, trên Flickr
| | | | | Veteran Member Registered: March, 2009 Location: Salt Lake City, UT Posts: 509
2 users found this helpful
| | Review Date: September 16, 2010 | Recommended | Price: $320.00
| Rating: 8 |
| Pros: | zoom range, decent IMQ, near silent AF | | Cons: | Not good for MF, a bit heavy, SDM DEAD | | Sharpness: 9
Aberrations: 10
Bokeh: 8
Autofocus: 9
Handling: 9
Value: 8
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I do not have many zooms (less than 10). This is one of the best ones. The quality of zoom lenses have improved dramatically over the years. They have become smaller in size, larger in aperture and having wide zoom range. Front element is no longer rotating. There is no need to change focus while zooming. There are also FREE and Internal focusing, you name it. While the design has improved, the addition of ED and AL lenses also helped. It is particularly evident in the IMQ of the borders and extreme borders. All in all, zooms can rival primes in certain condition and if you not pay too much attention to details.
However, they are not primes. None of them (except maybe one) has aperture larger than f2.8. The IMQ at the largest aperture is still lagging particularly at the far end. They are more prone to flare and distortion. The extreme borders are still lacking in IMQ. BUT they are more convenient than primes in day light conditions.
I am not sure how to compare this lens. Let me compare it with the legendary but often ignored FA 28-70mm F4. First, I have to say that I am not going to sell the FA at the moment.
Second, this DA is certainly better built than the FA 28-70mm f4. The front does not rotate when focusing. The zoom ring is more smooth, which is important for shooting videos. It also comes with a lens hood. But image quality wise, it is only slightly better better that the FA in the center and in certain occasions. The FA has quite a bit of personality itself and is much lighter than the DA.
Third, the DA is better at close focusing. The DA is better at the extreme borders and at 50-70mm range.
However, it is much bigger in all dimensions than the FA, perhaps due to IF design and the zoom range. Focusing is relatively fast. The downside is that it is not good for MF, since the focusing throw is too short. The upside is that it is easy for videoing.
Not good for low light. IMQ degrades at the borders at the 70mm range. Resolution is not the highest at f4. Am I asking too much? 
While not big on zooms, happy so far.
EDIT: SDM motor dead soon after getting this lens from a PF member, have to send to Pentax for a fix. Come back SDM motor replaced. But it was not a pleasant thing So lower my grade by one point.
 | | | | | New Member Registered: February, 2010 Location: USA Posts: 5
2 users found this helpful
| | Review Date: March 8, 2010 | Recommended | Price: $479.00
| Rating: 9 |
| Pros: | Build quality, image quality, focal length | | Cons: | size | |
Great all around lens with a good focal range. Seems a tad large and somewhat heavy on my Pentax K-x. Probably be a fantastic lens on a larger body, so I may have to acquire a K-7! Just have to make sure other body can take advantage of the SDM.
All in all ... very nice lens!
| | | | | New Member Registered: April, 2015 Posts: 11
1 user found this helpful
| | Review Date: July 21, 2019 | Not Recommended | Price: $291.00
| Rating: 4 |
| Pros: | Silent AF. | | Cons: | Not sharp enough. Sigma 17-70mm f/2.8-4.5 is far better. | | Sharpness: 4
Aberrations: 8
Bokeh: 8
Autofocus: 10
Handling: 9
Value: 1
New or Used: New
Camera Used: K-30
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Sigma 17-70mm f/2.8-4.5 is far better.
| | | | | New Member Registered: January, 2012 Location: Budapest Posts: 13
1 user found this helpful
| | Review Date: September 12, 2016 | Not Recommended
| Rating: 7 |
| Pros: | Optically the best Pentax standard zoom for my taste | | Cons: | SDM; AF. wobbling at open zoom | | Sharpness: 10
Aberrations: 10
Bokeh: 9
Autofocus: 2
Handling: 4
Value: 7
New or Used: Used
Camera Used: K-5
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This is optically the best Pentax standard zoom I have ever seen.
Because of the underdsized SDM and poor AF I do not recommend.
It would have sense to update this lens with WR and DC motor. This would be my choice and I would highly recommend it after that. Unlike the excellent 16-85 this is parfocal, having distance scale and constant F4 aperture (I need three of them). So I can imagine easily both in the Pentax line up in spite of the similar zoom range. (((Now my standard zoom is still the 16-45.)))
RICOH please make this one for me: 
SMC Pentax-DA 17-70mm F4 AL [IF] DC WR | | | | | Forum Member Registered: January, 2014 Location: Bydgoszcz Posts: 98
1 user found this helpful
| | Review Date: October 6, 2015 | Not Recommended | Price: $600.00
| Rating: 5 |
| Pros: | great contrast and color rendition | | Cons: | autofocus | | Sharpness: 7
Aberrations: 3
Bokeh: 6
Autofocus: 1
Handling: 5
Value: 5
New or Used: New
Camera Used: K-3
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The color rendition and contrast of the lens is very good. Also the the range of having a zoom with 17 and 70 at the end is perfect for walk around zoom. Anyway the auto focus (SDM) is a horror. Mine lens is from early productions. Auto focus worked good for 2 years then it started to have a problems, specially focusing at the end of the zoom range. Then it stopped working at all. I sent it to pentax service and they decided to replace the sdm motor inside. After a year the problem came again and now I use the lenses manually, without autofocus. I gave the lens to non pentax service just to see what might be the problem with the sdm motor drive and I received an answer that the whole drive is too small for this big lens to move it properly.
Here are some shots I did with this lens.  [url="https://www.pentaxforums.com/gallery/index.php?n=45893"]
| | | | | New Member Registered: March, 2015 Posts: 5
1 user found this helpful
| | Review Date: August 18, 2015 | Recommended | Price: $300.00
| Rating: 9 |
| Pros: | Image quality | | Cons: | AF above 50 mm | | Sharpness: 10
Aberrations: 9
Bokeh: 9
Autofocus: 7
Handling: 8
Value: 9
New or Used: Used
Camera Used: Pentax k-30
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In my eyes the primary competitor of this lens in the Pentax line-up is the 18-135. I had a 18-135 at the time I bought the 17-70 second hand. It was the reviews and user opinions which made me decide to give the 17-70 a try. Indeed the 17-70 turned out to be a much better performer IQ-wise. I really like the uniformly solid resolution of this lens. Pictures taken with the 18-135 often seem rude and unprofessional when compared to the 17-70. The price is the narrower focal range. Unfortunately, I can confirm the AF problems at the long end (above about 50 mm). If the camera finds focus, the image is not blurred, but often the AF is just walking up and down and finally gives it up. Altogether I find it a good choice if you want a standard zoom with professionally looking image quality.
Here is a selection of pictures I took with this lens.
| | | | | Forum Member Registered: October, 2014 Posts: 85
1 user found this helpful
| | Review Date: November 18, 2014 | Not Recommended | Price: $350.00
| Rating: 6 |
| Pros: | very good sharpness, constant maximum aperture F/4, wide focal lengths range | | Cons: | SDM problems | | Sharpness: 9
Aberrations: 7
Bokeh: 6
Autofocus: 3
Handling: 7
Value: 3
New or Used: New
Camera Used: Pentax K-5 IIs
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The smc Pentax-DA 17-70mm F/4 AL IF SDM is a compromise model which does not make much of an impression. Certainly the manufacturer tried to develop a convenient lens with a fairly wide range of focal lengths and a constant maximum relative aperture F/4 and substantially very good sharpness. But in reality the lens is not sharp enough near the 70mm, has SDM motor problem which affects the accuracy of autofocus and the bokeh is neutral and leaves something more to desire.
If the Pentax 18-55 kit lens became a limitation for you and you would like to purchase a pro lens, it makes sense to buy the smc Pentax-DA* 16-50mm F/2.8 ED AL [IF] SDM and not to make compromises. Believe me it's wise to purchase a high quality pro lens and enjoy all the benefits of such lens (outstanding image quality, excellent build quality, dustproof and water resistant body, ultrasonic motor) than to buy a budget lens which you will be soon trying to sell on a secondary market.
My review of my copy of the lens with shots at different focal lengths and apertures:
http://aflenses.net/reviews/a-subjective-look-at-smc-pentax-da-17-70mm-f4-al...pentax-k-5-iis | | | | | New Member Registered: April, 2012 Location: Independence, MN Posts: 1
1 user found this helpful
| | Review Date: April 3, 2012 | Recommended | Price: $480.00
| Rating: 10 |
| Pros: | great range, quality feel, quiet, vibrant | | Cons: | no Weather proofing | | Sharpness: 10
Aberrations: 10
Bokeh: 9
Autofocus: 10
Handling: 10
Value: 10
New or Used: New
Camera Used: k5
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If this had weather-sealing and a bit more "bling", it would be a DA*. I might say if it was a bit faster too, but Pentax's current short/mid zoom DA*16-50mm doesn't look that great until it is at F4 anyway. I really debated between the DA17-70 and the DA*16-50. I own several DA*'s in other ranges and I like the little "extra" they come with.
Ultimately, without the WR and the Gold Band and perhaps the 2.8 or 3.5 designation that would attract more attention, this lens is simply good, excellent even. And 20mm more reach is greatly appreciated, especially with portrait work. Pentax has 5 short zooms. Their Kit zooms are better than expected. And we are programmed to presume the DA*16-50mm is the one we should all be saving for. This DA17-70mm, especially at the $480 I paid, is the best choice. Not just for the money, it is the best choice period. It is so consistant, center to edge and in different light. The DA*16-50 needs to be compensated for, the DA17-70mm you just shoot.
The Sigma 17-70mm and Tamron 17-50mm each have some noteworthy strengths, but some negatives as well. Of all 7 choices I know of that you can hang on the front of a K5 and capture the midrange zoom, this is the best. If you don't have to have weather-sealing, buy it; enjoy it. Don't let anyone make you feel bad!
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