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Pentax smc DA* 50-135mm f/2.8 ED AL (IF) SDM

Pentax smc DA* 50-135mm f/2.8 ED AL (IF) SDM lens
Pentax smc DA* 50-135mm f/2.8 ED AL (IF) SDM lensPentax smc DA* 50-135mm f/2.8 ED AL (IF) SDM lens
 

APS-C méretű vetített kép

Az APS-C méretű képet vetítő objektíveket kimondottan a digitális fényképezőgépekhez fejlesztették, ezért nem használhatók filmes gépeken, vagy olyan digitális fényképezőgépeken, amelyekben az APS-C méretűnél nagyobb érzékelő található.

 

Ultrahangos AF

Az ultrahangos automatikus élességállítással szerelt objektívek általában halkabbak és gyorsabbak, mint a tradicionálisan működő objektívek.

 

Egy vagy több alacsony szórású lencsetag is van benne

Az alacsony szórású lencsetagok segítenek csökkenteni a kromatikus aberrációt.

 

Nem stabilizált

A képstabilizátor segít csökkenteni a kéz remegéséből adódó elmosódásokat. A stabilizátor hatása elsősorban nagy gyújtótávolságnál és gyenge megvilágításnál érezhető. A képstabilizátor 1-3 fényértéknyi előnyt biztosít a nem stabilizált objektívekhez képest.

 

Fém bajonett

Az olcsóbb objektívek általában műanyag, míg a drágábbak fém bajonettel készülnek. Általában a fém bajonettek tartósabbak, így gyakori objektívcserénék ez a szerencsésebb. Ha egy fényképezőgépet főleg egy objektívvel használunk, akkor a bajonett anyaga nem annyira lényeges.

 

Belső élességállítású

A belső élességállítású objektívek mérete az élességállítás során nem változik.

 

A front lencse fix

A fix frontlencse az élesség és/vagy a gyújtótávolság állításakor nem fordul el. Ez lehetővé teszi, hogy a fotós szirom alakú napellenzőt használjon. A fix frontlencse megjönnyíti a polarizációs szűrők használatát is.

 

Időjárásálló

Az időjárásálló objektívek védettek a víz és a por ellen. Ugyan nem vízállóak, de esőben és más nedves, párás környezetben is jól használhatók. Egyes szigetelések csak a víz vagy csak a por ellen védenek, nem mindkettő ellen. A szigetelés csak akkor működik, ha az objektív egy hasonló módon szigetelt vázon van.

 

Nincs becsúsztatható szűrő

A becsúsztatható szűrőket olyan objektíveknél alkalmazzák, amelyek frontlencséje túl nagy, illetve amelyek látószöge túl nagy ahhoz, hogy hagyományos szűrőket lehessen rájuk tenni. Általában a nagy fényerejű tele, illetve az ultra-nagy látószögű objektíveknél fordul elő ez a megoldás.
A PENTAX DA * 50-135mm F2.8 ED (IF) zoom teleobjektív kimondottan a PENTAX digitális SLR fényképezőgépekhez készült, biztosítva az elérhető legmagasabb optikai minőséget. Az aszférikus lencsetagoknak, és a speciális optikai tagoknak, illetve a speciális bevonatnak köszönhetően ez az objektív kiemelkedő a kontraszt és a saroktól-sarokig megfigyelhető élesség tekintetében. Az 50-135mm speciális időjárás- és porálló külsővel készül, hogy esőben vagy poros környezetben is hosszú ideig tartós legyen. A beépített ultrahangos motort használó új SDM rendszernek köszönhetően az élességállítás finomabb és halkabb lett. Az objektívet ellátták a PENTAX által kifejlesztett Quick-Shift Focus rendszerrel, ami gyors átkapcsolást biztosít a manuális élességállítás módba, illetve a szintén PENTAX fejlesztésű SP (Super Protect) bevonattal, ami a port, a vizet és a szíros szennyeződéseket hivatott távol tartani.

Pentax smc DA* 50-135mm f/2.8 ED AL (IF) SDM Specifikáció

Elérhető bajonett(ek) Pentax K
Felhasználási terület(ek) Portré, Sport, Tájkép
Kategóriák Tele zoom
Szorzó 1.5×
Stabilizátor nem
Gyújtótávolság 50 - 135 mm (2,7× zoom)
Objektív felépítése 18 lencsetag 14 csoportban
Látószög 35mm: nincs adat
digitális: 31.5-11.9°
Lamellák száma 9
Legnagyobb blende nagy látószög: f/2,8 tele: f/2,8
Legkisebb blende nagy látószög: f/22 tele: f/22
Legkisebb tárgytávolság 1 cm
Nagyítás 0,17×
Szűrőmenet 67 mm
Méret ∅ 76.5 × 136 mm
Tömeg 685 g
Megjegyzések
AF sebesség nincs adat
AF hang
Belső élességállítás igen
Belső zoom nincs adat
Fix frontlencse igen
Bajonett típusa fém
Időjárásálló igen
Becsúsztatható szűrők nem
Ultrahangos AF igen
APS-C méretű vetített kép igen
Alacsony szórású lencsetag igen
Kemény tok nincs adat
Puha tok tartozék
Napellenző tartozék
Állvány adapter nincs adat
Pentax smc DA* 50-135mm f/2.8 ED AL (IF) SDM Specifikáció

Pentax smc DA* 50-135mm f/2.8 ED AL (IF) SDM Tesztek

Pentax smc DA* 50-135mm f/2.8 ED AL (IF) SDM a hírekben

Other reviews

Pentax smc DA* 50-135mm f/2.8 ED AL (IF) SDM Olvasói tesztek

Leghasznosabb olvasói vélemények az Amazonról

One of the best Pentax lenses ever!

2007. szeptember 06.

After anxiously awaiting the new DA* series of lenses, I bought it the day it was released. I had to photograph the Ujena Bikini Jam in Puerto Vallarta, Mexico and KNEW that I needed the benefits of a tightly sealed, weather proof lens because of the intense humidity. When I first mounted the lens to the body of my K10D (after updating the firmware of course) I was surprised at how incredibly quiet the motor is. I've never had this experience with any lens I've owned. I'm so used to the slight "whir" sound that lenses produced, it was hard for me at first to tell if it was working! The lens focuses quickly and accurately. The lens is nicely finished with nice rubber ribbing on the barrel. It accepts 67mm thread size filters. There may be a temptation to get a standard type Skylight filter. Spend the extra money for the Super Multicoated type. After all, if you spend nearly $1,000 for a lens, why would you skimp on a lower priced filter? The manual focusing mechanism turns freely after you reach the end of the focal length on either side. This is done so that you do not damage the focusing mechanism. For manual focus option, instead of setting your camera body to manual focus, the lens has a switch that allows you to switch between manual focus and auto focus without having to have your body set on manual focus. This is convenient. If the lens is hunting you can easily click over the switch with your thumb without having to remove the camera from your eye. There is no longer an aperture ring on the new digital series lenses. This is logical since all the f-stop settings are now done on the camera body. The stunning sharpness and contrast of this lens is amazing. Distortion is practically non existant and flare is tightly controlled. Make sure you have the lens hood attached to help make sure flare is not an issue. This lens makes the lower priced lenses seem inferior by comparison. This lens is made for professionals and it shows. If you are currently looking for a professional quality Pentax zoom lens, and need the high speed of a 2.8 lens for portrait or glamour photography, this is the one to get. This is an outstanding lens from Pentax. Rush out and get it!

Serious Autofocus Problems

2008. február 06.

First the good: This is an impressive lens in both feel and looks. There's no mistaking that this is professional glass. For portraits and non-flash situations like stage performances, I wanted a lens that was top-notch in sharpness and overall image quality. According to the specs and the various reviews, this lens delivers...and that's why I bought it. Now the bad: I got a bad copy. When you point your camera at the intended subject and press the shutter, you expect the autofocus system to nail the focus, at least the vast majority of the time, especially with an expensive lens like this. Even a basic point-and-shoot is pretty reliable in that regard. However, not so with the DA* 50-135 copy I received. The majority of my shots are slightly off-focus, enough to not only cancel out the superior sharpness qualities of this lens, but to also ruin what would othewise be an excellent shot. This problem occurs in all types of shooting situations and camera/lens settings. What is more disappointing than having my one faulty lens is finding out that there are others who are experiencing similar problems with their DA* lenses. What I do know is that when I use any other Pentax or Tamron lenses on my K10, everything works fine (yes, I've upgraded the firmware to enable the SDM). In the few times that the focus is spot-on, I can say that the resulting image is quite impressive indeed.

For this amount of money, my tolerance to getting a bad sample is a bit less than if this had been a consumer-grade lens at half the price. I really, really want this lens to work for me the way it's supossed to because I'm a big Pentax advocate and like their recent products and direction in the D-SLR market. So I'm returing mine for another and keeping my fingers crossed. I'll update this review once I get the new copy and can then hopefully report on the superior performance capabilities of the lens.

Update (2/13/08): I was told by Amazon that they couldn't send me a replacement because of a supplier problem, so I'll be getting a refund. After further research into the professional Pentax DA* lens series and seeing a pattern of issues, it's probably best to skip it for now. I'm putting my money on the new Tamron 70-200 f2.8 due out in March. There aren't too many high-end lens options for Pentax D-SLR owners, so there's a lot of anxious folks out there waiting for the first reviews of the new Tamron to come through with hopes that it will deliver the same high level of image quality as a properly working DA* 50-135.

Update (3/2/08): So I find out from Tamron that they don't know when the 70-200 f2.8 lens will be released for the Pentax mount - possibly summer. Since I can't wait that long due to upcoming shooting events, I decided to take another chance with the DA* 50-135 from my local Calumet store. I was able to first test the lens for both focus and centering accuracy. It seemed to work fine - sold! After a number of test shots over the following days, I quickly was able to see that this is indeed a "Five Star" professonal lens. I had recently picked up the Tamron 28-75 f2.8, which is exceptionally sharp for a consumer lens, and did a number of comparison shots with the DA* 50-135. What I found was that the Pentax lens was unquestionably sharper across all apertures, but the weakest at f2.8 (although not that bad at all) with some sharpness falloff at the boarders. The SDM feature is certainly far quieter than the camera's screw-drive motor and very pleasing to have, but I'm not convinced it's any quicker. Image quality from what I've seen so far is excellent. Although the lens body is constructed of plastic, it looks and feels solid and of exceptional quality; a real joy to handle. Now if I could update my rating of this lens, I'd change it to four stars but not five - only because of the number of bad copies released. For a high-end lens, quality control should be better. So far, I'm very pleased with the performance of this professional lens.

Update (3/9/08): Well, after a week of continued testing of this lens, what I've discovered is that this lens, too, now has a focus "problem." While subjects seemed to be sharp most of the time initially, I found that more and more shots were slightly off more often. I then did a number of Point of Focus / Depth of Field tests by shooting a finely marked yardstick from above at about a 45 degree angle about five feet away. With the camera on center spot AF, I selected a point on the ruler and took a number of shots at various apertures and focal lengths. What should occur is that if your Depth of Field is say four inches in length(the area that's sharply focused), your Point of Focus should be about in the middle or just forward of that point. What I found with my second copy of the DA* 50-135 is that the Depth of Focus starts just about at the Point of Focus and goes back. With open aperture shots from f2.8 to f3.2, it's not uncommom for the DoF to occasionally start just after the PoF - and you end up with a slightly fuzzy shot. While the new K20D is supposed to allow for custom adjustment of the DoF and PoF alignment on a lens-to-lens basis (cool!), I'm not keen on keeping a sub-standard copy so that I can fix it by purchasing the new K20D. It's a boarderline issue here - the lens works most of the time, and when it does it's quite impressive. So this lens may also get returned for another, or I'll keep it and eventually have it adjusted by Pentax or "fixed" via the K20D...eventually. I guess Dirty Harry's famous quote applies to those considering the purchase of this lens: "...You gotta ask yourself a question; 'Do I feel lucky?'" My review is back down to two stars.

Update (8/16/08): I upgraded from the K10D to the K20D. The K20D's ability to adjust the auto focus system for individual lenses made it possible to finally see how good the Pentax 50-135 really is, since I had a preexisting focus issue with my copy of this lens. I don't believe there is another lens for the Pentax mount that delivers this high a degree of overall sharpness, contrast and saturation. With a K20D's auto focus adjustment cranked up to max -10 to compensate for the lens calibration issue, focus with this lens is now more accurate than any other lens I own. Just don't expect great performance for action shots (that's the Pentax auto focus system not the lens). Where this lens is a real jewel is at music concerts or stage performances with stage lighting. F2.8 at any focal length is still sharp in the center but f3.5 - f4.0 and higher is excellent overall. I've found that the K20D is the desired camera with this lens since this type of shooting may require wide open aperture and up to 2000 ISO (the K10D cannot match the K20D in lower high ISO noise and greater resolution - when NR is on). However, this would still be one of the best lenses you could use on your K10. Like other reviews on the 50-135 lens, a little more reach would be nice ...but then there's the Pentax f2.8 200mm prime. Finally, it's nice to be using a five star lens!

Update (11/21/09): This may be one of the best Pentax lenses made. It's a pro-level lens without a doubt - pictures taken with it just have that special look of sharpness, contrast, color. I updated the rating to four stars and not five only because of my problems with the SDM focus system starting to slow down over time and not even work on occasion when first mounting the lens until "priming" the focus mechanism by spinning it by hand. Since my K20 has become my backup camera to the Canon 7D (sorry, returned two K-7's), I may install a Katzeye focus screen on the K20 so that the 50-135 can be effectively manually focused should the SDM continue to slow or fail altogether (a firmware option to switch from SDM to the in-body screw drive would be wonderful!).

Update (2/7/10): The SDM is now dead. I'm not sending it in for repairs as I believe there is an inherrant problem with the SDM design/build so that a fix may also not last that long. I've been reading about others with similar problems with their SDM. Since I've been so impressed with the Canon 7D and the L lenses used with it, the failure of my previously favorite lens (50-135) has not been an issue, until I remind myself that the K20 is still my backup camera.

Great lens

2008. június 23.

I love this lens. It is fast, sharp, and has an extremely rugged build. It is definitely a large, heavy lens compared to the DA 50-200MM, for example. On the other hand, the weather sealing is evident, the focusing ring is large, and all lens motion is internal. The SDM is quiet (though not quite a silent as the DA* 16-50mm) and silky smooth. Overall this lens is well worth the investment.

Superb zoom for the K20D

2009. január 02.

This is the 2nd sample of the lens, the first was decentered and could not get a sharp photo out if it despite adjusting the AF many times. Amazon sent a replacement before I even got a chance to ship the bad one back, so I had a few days to play with both to make sure the first was actually bad and it was. The 2nd copy was Far sharper and AF'ed correctly with only a minor -3 adjustment. My belief about the 1st bad copy maybe handling as the hood and lens cap was lose inside the box/bag while the lens and box was new and there was no visible damage on the outside or I would not have opened it. Props to Amazon for rather quick turn around with the replacement and no hassles. I am mentioning this as I think Pentax needs to rethink the packaging, while it seems good it might not be enough to protect against typical mail room gorillas and if the hood and lens cap popped off the lens with out damaging the box who knows how they were handling it.

Now more on the 2nd copy, the lens is well built but I find the hood's inner part that attaches to the lens a bit thin, prone to cracking but it will not affect attaching to the lens or actual performance but it is an obvious weak point when compared to the rest of the lens but no worse than most other lens hoods. The lens is made of composites but feels good, not cheap plastics and the build is tight. The weight is obviously all the glass elements inside and this lens has more heft that it would seem for it's size, you would be advised to have a grip on your K20D/K10D to balance the weight. The weight is just right with the grip to also balance on a tripod, the center of gravity will be right before the lens mount and makes perfect balance hand held as well.

Optically I was a bit worried at fist due to the first copy being bad and I gave the 2nd copy a real workout. On test targets it was obvious the lens is very sharp, a tad sharper than my 70mm limited with the exception of 135mm F2.8, it's ok in the center but soft corners that sharpen up at F4, at F5.6 to F11 this lens really shines at all focal lengths. I have not noticed too much bad Ca's or any purpling with my 2nd copy either.

AF speed tho could be better, it's not the typical Pentax slow af syndrome but the lens has a very very long travel from mix to infinity to focus, point to point focusing is decent but slower than the 40mm limited or the 70 ( which happen to be among the fastest focusing lenses on any Pentax ). The Af will track an aircraft in flight well enough and thats good enough for me. In low light it does hunt less than I would expect and the accuracy ( on the 2nd copy ) is perfect and consistent. Sdm is quiet and works as advertised, the focus ring does not turn with af and will turn both past min and max, the friction in the ring does make it good to manually focus but so far the af is more accurate than me trying to focus manually and I am normally good manually focusing.

One word of warning, this lens needs to be shot with a shutter above 1/200 sec, even with the SR on ( and it does work ) hand held. You can see the difference very obviously as the lens is sharp enough to spot the difference. The resolving power is greater than my eyes can do as it picks up the texture on white paper and fine details in text I would only see with a macro lens, these details are lost ( tho the shot is sharp! ) when shooting under 1/125 even with flash and sr if hand held. This is my reasoning at least and this is not a macro lens, we're talking regular focus distances here.

One thing I have noticed on both copies is that focusing between 1 and 1.25m the bokeh is, well just strange, not bad but not great either, beyond 1.5m it's butter smooth right to infinity.

This lens is overall one of the best zooms I have used on any system, it is a little soft 135mm wide open and the plastic hood is a bit cheap but the rest ( of the 2nd copy ) is up to par with it's price. This lens is also related to the tokina 50-135 but while they may get a tripod mount, we get sdm ( usm, hsm sw or what ever, all the same ) and weather sealing, that if it is as good as the K20d's well done weather sealing makes this a very good outdoor/unfavorable weather shooting package. Tho I would be just a little concerned with the lens in drop/kick/knock situations but most zooms are prone to misalignment in that situation, here is where a prime would be better. I will get a chance to have this lens tested against a canon 70-200L soon but I think the Pentax will hold it's ground against it, The Nikon 70-200 F2.8 vr is as sharp to 135mm but that lens is 2x the price of the 50-135 and not sealed! So there is my diatribe about the Pentax 50-135mm F2.8, I will add more as I get to play with this lens more.

Best lens!

2008. március 28.

I have owned this lens since the first week it came out and I am still amazed by the pictures it is taking!

This lens produces the most VIVID, SHARPEST, CLEANEST, and most importantly, 3-D feel pictures I have ever seen.

Mt. FUJI picture is an excellent example. I took that one on a bullet travel at 150 mph yet it came out as sharp as it can be at ISO 100.

Get this lens now and enjoy take picures with it. You will be hooked.

Pentax smc DA* 50-135mm f/2.8 ED AL (IF) SDM Minta fotók

Pentax smc DA* 50-135mm f/2.8 ED AL (IF) SDM Kiegészítők

Napellenzők a Pentax smc DA* 50-135mm f/2.8 ED AL (IF) SDM objektívre

67 mm Szűrők

67 mm Polár szűrők

67 mm UV szűrők

67 mm Skylight szűrők

67 mm Objektívsapkák

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