Buy Sigma 50-500mm f/4.5-6.3 APO DG OS HSM SLD Ultra Telephoto Zoom Lens for Pentax Digital DSLR Camera Order Today!
Design by : Sigma
Over All Rating Reviews : Great Deal : $1,659.00
Date Created : Mar 17, 2011 07:30:04
New Sigma APO 50-500mm F4.5-6.3 DG OS HSM. This is a 10x high zoom ratio ultra telephoto zoom lens incorporating Sigma's original Optical Stabilizer function. This lens covers a wide range of focal lengths from 50mm to 500mm ultra telephoto. The OS (Optical Stabilizer) function offers the use of shutter speeds approximately 4 stops slower than would otherwise be possible. For Sony and Pentax mount, the built-in OS function of this lens can be used even if the camera body is equipped with an image sensor shift anti-shake system. As compensation for camera shake is visible in the view finder, the photographer can easily check for accurate focus and ensure there is no subject movement. Four SLD (Special Low Dispersion) glass elements provide excellent correction of color aberration. The Super Multi-Layer Coating reduces flare and ghost and ensures high image quality throughout the entire zoom range. This lens has a maximum magnification ratio of 1:3.1 (at the focal length of 200mm) making it ideal for close-up photography. This lens incorporates HSM (Hyper Sonic Motor), ensuring quiet and high speed AF as well as full-time manual focus capability. The addition of the optional 1.4x EX DG or 2x EX DG APO Tele Converters produce a 70-700mm F6.3-8 or a 100-1000mm F9-12.6 MF zoom lens respectively. This lens is equipped with a Petal-type hood to block out extraneous light. The filter size of this lens is 95mm and the lens is supplied with
Buy Sigma 70-200mm f/2.8 DG HSM II Macro Zoom Lens for Pentax Digital SLR Cameras Order Today!
Design by : Sigma
Over All Rating Reviews : Great Deal : $763.96
Date Created : Jan 22, 2011 03:34:06
This large aperture thelephoto zoom lens has a minimum focusing distance of 100cm (39.4) and maximum magnification of 1:3.5. Two SLD (Special Low Dispersion) and three ELD (Extraordinary Low Dispersion) glass elements provide excellent correction for all types of aberrations. The super multi-layer coating reduces flare and ghosting. High image quality is assured throughout the entire zoom range. This lens incorporates HSM (Hyper Sonic Motor), ensuring a quiet and high speed AF and full-time manual focusing capability. An adjustable and removable tripod collar is included as a standard component.
Buy Sigma 50mm f/1.4 EX DG HSM Auto Focus Lens for Pentax AF Cameras (*Auto Focus only if body supports HSM) - USA Warranty Order Today!
Design by : Sigma
Over All Rating Reviews : Great Deal :
Date Created : Dec 10, 2010 10:00:06
This is a large aperture prime lens with a standard focal length of 50mm, ideal for all digital SLR cameras. This lens has superior peripheral brightness even at the maximum aperture and corrects a possible sagittal coma flare. This lens is perfectly suited for a wide range of subjects enabling outstanding, sharply defined images against a nicely blurred background. The fast, F1.4 aperture makes this lens desirable for use with Digital SLR cameras. This lens effectively becomes an 80mm medium telephoto lens on digital cameras with APS-C size image sensors. The optimum optical design and molded glass aspherical lens element provide excellent correction for all types of aberrations. The super multi-layer lens coating reduces fare and ghosting. Superior optical performance is also ensured throughout the focusing range. This lens has a minimum focusing distance of 45cm (17.7") and has maximum magnification of 1:7.4. It creates a very attractive blur, even when a small aperture is used. This lens incorporates HSM (Hyper Sonic Motor), which ensures a quiet and high-speed AF* as well as full-time manual focus override. Please Note: * If the camera body does not support HSM, auto focus will not be available. (will work on manual)
This is a lens I purchased to replace a Tamron 70-300mm lens that wasn't cutting it for me at the long end of its range.
The Pentax lens here is a fantastic lens for its price. It isn't a limited, and for 0, you shouldn't expect perfection. However, if you are a hobbyist, like myself, and you'd like to be able to shoot your camera for 300 mm (in addition to all those between), this lens works well.
I've found that its strengths lie at the long end rather than the short end like the Tamron did, and overall it works well over the full 55 to 300 mm range. The other thing I like about it is that it covers that 55 to 70 mm range that some of the other non-Pentax lens don't cover, yet could be needed if you are adding such a lens to complement the kit lens with your camera.
Overall, I'd say this lens is more of the type you will use in a longer setting, meaning shooting towards the infinite end of the focus range. Its minimum focus distance is not too close, and when you are on that order of distance (i.e. < 50 ft), I actually think the Tamron lens was a bit sharper and included the ability to focus at a more macro type level. This lens does not provide that ability, although an extension tube could help.
I do like how this lens allows you to manually adjust focus while the autofocus in engaged. This is something all camera and lens manufacturers should strive for. It is also nice in terms of size. For a 55 to 300 range, it is actually pretty light, mostly due to its slower aperture settings f4-5.8 at the fastest. That isn't great for low light settings, but then few zoom lenses are. I use the lens for landscapes or elements of landscapes, and find that a tripod is quite useful anyway since at 300 mm, one really is working at the limits of their ability to handhold a shot anyway. It is easier, however, given the smaller size of this lens just not ideal.
Buy Sigma 18-250mm f/3.5-6.3 DC OS HSM IF Lens for Pentax Digital SLR Cameras Order Today!
Design by : Sigma
Over All Rating Reviews : Great Deal : $479.00
Date Created : Sep 17, 2010 15:34:12
The SIGMA 18-250mm F3.5-6.3 DC OS HSM incorporates Sigma's original anti-shake compensation function, with a 13.8 times zoom ratio. For the camera have anti-shake function in the camera body, this lens's Hybrid Optical Stabilizer provide not only anti-shake function for the camera body compensation, but also provide the function to compensate the image shaking in the view finder of the camera like anti-shake compensation built in the lens. Incorporating four Special Low Dispersion glass elements and three Aspherical lens elements provides excellent image quality throughout the entire zoom range. This lens has a minimum focusing distance of 45cm (17.7 inches) at all focal lengths and a maximum magnification of 1: 3.4 reproduction ratio, making it ideal for close-up photography. An inner focusing system eliminates front lens rotation, making it suitable for use with circular polarizing filters and the supplied petal-type hood. Incorporating super multi layer coating reduce the ghost in the backlight photography.
After tons of browsing reviews for superzooms from Nikon, Sigma, and Tamron, I took a gamble on the Sigma for reasons I found all over the reviews: low distortion, HSM (focus), and bokeh. And below is what I found after using it for a while:
Pros: 1. The most surprising factor on a D90 body is that it is only slightly bigger than D90's kit lens 18-105mm VR, and therefore IT DOES NOT BLOCK THE FLASH! I was almost ready to squeeze some money for an external flash, but it was put on hold because the camera flash can work fine. 2. Virtually no lens creep (and there is a lock button in case it happens). Quality construction that is. 3. Nice bokeh, as usual Sigma lenses have creamy bokeh, which is a big plus for such zoom lenses. 4. When in manual focus, the focus ring is very smooth
Cons: 1. The biggest problem for me is no manual overriding the focus. Auto focus would lock the focus ring on the lens, and the ring actually would rotate when it is focusing. Only when switching to manual focus can I turn the focus ring. 2. As indicated in most reviews, the sharpness may not be optimal (I can only compare it to Nikon 18-105mm). BUT it is not that bad, even for a pixel peeper like me, I am fine with its sharpness most of the time when looking at it @100%. 3. OS functions kind of oddly (to me). The Nikon 18-105mm turns VR on only when I half-press the shutter, otherwise it is off. But Sigma 18-250mm seems to have it on for a certain time. When the camera is idle for some time, OS is then turned off, and you can hear it from the lens. Wondering if this is wasting more battery. Also as indicated in the reviews, the OS doesn't seem to be as solid as Nikon's or Tamron's stabalization. But of course, it's no big deal when you have a steady hand.
Overall, it's a 5 star for me. Good features, quality, price, and some minor cons. I was worried the most about its sharpness, but it turned out satisfactory. So I am very happy with it.
