12/10/2023 0 Comments Sigma 24 70 2.8 if ex dg hsm![]() With 9 blades, point-source lights become obnoxious 18-point stars at smaller apertures. So in the end, there really is no good option for excellent focus for every stopped-down shot.Īnother issue I have noticed is the number of aperture blades. I could, of course, depress the DOF button, but that would increase the DOF and darken the viewfinder, therefore also making it hard to focus. It makes it difficult to focus as nothing is as sharp as it should be when it is in focus. Due to a constant f/2.8 when focusing, I have noticed this softness through the viewfinder. I have even found it difficult at times to use MF. ![]() This is not due front focus from the AF - I shoot a fair amount in MF (not action) and I get the same results. This is most true at 200mm, with the middle of the zoom range being the best. I also get some annoying CA at the wider apertures - soft glows with purple fringes from CA on "in-focus" objects are less than ideal, and I find that there is too much. I find my shots at f/2.8 essentially worthless as they are too soft. I've noticed the front focus problems at larger focus distances with AF as well, and at f/2.8 this problem becomes even more noticeable.Īnother problem is f/2.8. Usually switching to MF (the switch itself feels strong, but the plastic sliding piece on the outside doesn't feel like it will survive 10 years of switching between AF/MF) works, though. These are more noticeable when taking macro shots as the depth of field is narrower at closer focus distances. The lens is fast, the AF is fast enough, but I am not satisfied enough with the results.Įveryone says that there are front focus problems with this lens. My intent in purchasing this lens was to have a fast zoom for low-light sports without having to pay over $1000 (Canon's 70-200 IS 1&2). ![]() I decided to go with this one because the AF is supposed to be faster. I was mostly between this lens and the Tamron equivalent. Over 7,300 shots with this lens since then on my T2i. And if in future i'll buy some kind of that zoom i'll look to Nikkors 80-200 or 70-200 VR. So if you will shoot on that glass on high mpix camera like D600, than use only center of the image.ĪF is not so fast as it could be, for example nikons 80-200D, is 2-3 times faster.Īll in all used that lens for 2,5 year and moved to fix lenses. After 135mm to 170mm if AF was right image was slightly sharp f/3.5, and on 200mm all the way it was little bit soft and blurry all the time :(Īlso on FF camera, sharpnes on the border of the image lacks of sharpnes oll the time. So i can't rely on adjustments in camera.Īll in all if AF in lens was hitting the target right, than it was surprisingly sharp image until 135mm. But the main problem i got spotted, that 70mm i got 100% front focus, and after 135 to 200mm i got slight back focus. If on D90 i couldn't fix front or backfocus issue, so on D600 i do. Heavy, poor AF, soft from 135-200, back/front focus. When this lens is used with the optional 1.4x EX DG APO or 2x EX DG APO Tele Converters, it becomes a 98-280mm f/4 AF telephoto zoom lens or a 140-400mm f/5.6 AF telephoto zoom lens respectively. The overall length of the lens does not change during focusing and zooming, ensuring convenient handling.Ī removable tripod collar (TS-21) is included as a standard component. The lens design incorporates an inner focusing and inner zooming systems. This lens incorporates HSM (Hyper Sonic Motor), which ensures a quiet and high-speed AF as well as full-time manual focusing capability. The super multi-layer coating reduces flare and ghosting. High image quality is assured throughout the entire zoom range. Two SLD (Special Low Dispersion) and three ELD (Extraordinary Low Dispersion) glass elements provide excellent correction for all types of aberrations. This lens is suitable for taking all type of subjects such as portraits, landscape, and close-up pictures. This large aperture zoom lens has improved optical performance and retains close-up ability with a minimum focusing distance of 100cm / 39.4 in and maximum magnification ratio of 1:3.5. (From Sigma Lens literature) The Sigma Corporation is pleased to announce the launch of the new APO 70-200mm f/2.8 II EX DG Macro HSM.
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