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Sigma 28mm f/1.8 EX DG Lens for Pentax Camera
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- It comes with 9 diaphragm blades
- Its minimum focusing distance Is 20cm
- It has a maximum magnification of 1:2:9
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Style Name: Pentax and Samsung SLR Cameras
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The SIGMA 28mm Pentax Fit Lens has an advanced optical construction in order to obtain adequate periphal brightness with open aperture; The iris diaphragm has 8 blades to obtain beautiful out of focus images in the foreground and background; There is an impressive Dual-Focus (DF) mechanism which provides adequate torque of the focusing ring during manual focuing of the lens; This then allows for the use of a Petal-Type Hood and the easy use of a polarizing filter; This lens has macro capabilties with minimum shooting distance of 20cm and an agle of view of 75.4; Now you can take a picture of not only the subject but also the surrounding scenery; It incorporates a floating focus system and uses two aspherical lens elements for minimizing distortion, aberration and astigmatism; The lens construction has 10 elements in 9 groups; Dimensions: diameter 83.6mm x length 82.5mm; Weight: 500g
Sigma, Lens, EX DG, Pentax, Camera, Digital, SLR, Accessories
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The focus ring is easy to use whilst shooting video and manually focusing (much much better than 50mm 1.8)
Comes with lens hood and lens carry case
Additional 2 year warranty through Sigma makes it for me a great purchase.
Lens can also be used on a full frame body so certainly future proof when funds permit an upgrade.
Don't be fooled by other lenses telling you only they can do the job - this is a terrific lens and cracking good value.
about getting one but now after some testing I have no regrets.
The lens is very sharp already wide open but because of very large aperture contrast is a bit low (@F1.8).
Due to size it can not be really compared to pentax 31mm but if you are on budget and want to
take some nice (indoor) close-ups with shallow DOF then this lens will do more then well and I can
recommend it for such use.
There are better (lighter and smaller) alternatives for outdoor photo, but if you do not mind size
it is excellent lens even for that purpose.
Most helpful customer reviews on Amazon.com
As I said, I use this lens as "normal" on my crop bodies but on the 5D (I have the original not the Mark ii) it really shines as a wide angle lens. 28mm is the perfect indoor angle offering enough field of view to capture everyone in your scene but still allowing use of flash to fill the dark spots using my 580 EX II. I have essentially stopped using the 24-105 f/4L for wide angle work because this lens is so sharp.
Now, the obvious strong point of this lens is the f/1.8 aperture which is sharp, sharp, sharp even wide open with virtually no falloff and almost no CA. I never hesitate to just leave it wide and shoot in TV mode to stop action or to create action trails. Using it indoors at 400 ISO I get perfect images every time without the harshness of flash.
I have used this lens on these bodies with excellent results:
Rebel XTi (400D)
Elan 7 (35mm film)
Elan IIe (35mm film)
EOS 3 (35mm film)
So for crop or full frame, this is a great walk around, macro, and wide angle lens.
Let’s get the bad out of the way. Autofocus is the one area that is lacking on this lens. It’s noisier than my 50mm 1.4, and noticeably so. In poor light, I also find it searches for a focal point a little bit longer than other lenses I have used too. On my EOS-M, it’s too noisy to be used for autofocus during video, which I don’t use but some people may so it’s worth keeping in mind. In normal and good lighting conditions however, the AF is snappy and 95% of the time right on point. The manual focus override clutch takes a little getting used to, but it’s handy every now and then.
Now, on to what I love about this lens. The image quality is really quite excellent - better than I could have expected. I don’t want to blow things out of proportion by comparing it to an L lens, however the IQ is remarkable for a lens of this price (I bought mine for around $250 used). It certainly matches that of my old 17-35mm 2.8L (from the early 2000’s), particularly stopped down to around f/2.2. Even at f/1.8, the quality is pretty great, but f/2.2 seems to be the sweet point for my lens. Bokeh is lovely - as good as Canon’s 85mm 1.8 albeit a little different in "shape”. Colors and contrast (under the right lighting conditions of course) are rich without being overstated.
I used this lens at a recent wedding, and was a little bit apprehensive to see what my shots were going to look like on-screen. I was absolutely delighted - the lens exceeded all of my expectations! From group shots to bridal portraits, outdoor shots to the dimly lit reception hall - the lens handled every scene I could throw at it, and provided sharp images nearly every single time. My girlfriend (I was second-shooting) was using the Canon 24-70mm f/2.8L II beside me, and to be honest the ONLY difference between our shots in terms of hardware-based quality is that the 24-70 has slightly nicer bokeh. Otherwise, you would need to be a seriously experienced photographer to point out the difference.
With a decent build, a modest price tag (extremely inexpensive if buying used) and incredible quality, I can HIGHLY recommend this lens as a prime wide angle. It’s fast, very capable of producing sharp shots, and despite the autofocus issues I still find it to be a very worthy purchase. If I ever go full-time with photography, you can bet I’ll be investing in the 24mm f/1.4L from Canon. Until then, Sigma’s 28mm f/1.8 will be my go-to wide angle.
(Note: I THINK Amazon still allows URL’s in the comments section - if you want to see a high-res version of the image in my review, check out the comments!)
At F/2.0 starting from about mid-frame, the star points became more like a line or even crossed lines.
At F/2.8, it looks slightly better but those weird bokeh still present
I attached the my pictures including crops to show details near corner. They are converted directly from RAW by adobe camera raw, without any processing except cropping.
The only shortcoming that I have with this lens is the focusing speed. Overall it's pretty decent outdoors in good light and it works well for slower quarry indoors with poor light. I work at a church and the vast majority of my photos involve church events with youth or children running around. I can catch a lot of good shots with this lens, but I find myself missing a lot of opportunities because the focus was too slow. There's no internal motor. I have the Sigma 17-50mm f2.8 which has the SDM and it focuses much quicker, but doesn't have as open an aperture as this lens.