Sigma 24 70 2.8 if ex dg10/12/2023 Sigma’s EX lenses are known for their quality build and this lens does not disappoint in that regard. The angle of view of the lens is 84.1-34.3. At only 15” the lens has a very close focusing distance and a maximum magnification ratio of 1:5.3. The rounded blades are also responsible for the purpose of creating a beautiful soft bokeh. However, it can stop all the way down to f/22 as well. The diaphragm of the lens is made up of 9 rounded blades giving it a maximum constant aperture of f/2.8. Sigma has also provided multi-layer coating on the lens to ensure that ghosts and flares are suppressed to a large extent. The lens has a total of 14 elements including three aspherical elements, one SLD (super low dispersion) and one ELD (extra low dispersion) elements arranged in 12 groups. It also serves as a great portrait lens and is suitable for most lighting conditions because of the f/2.8 aperture. The lens is designed for landscape, wedding and a general purpose lens for everyday shooting needs. It features Sigma’s HSM (Hyper-sonic motor) which is a similar type technology to the USM from Canon and keeps the lens quiet during auto-focusing. It directly competes with a number of Canon’s and Nikon’s 24-70mm lenses in terms of its performance and features. This lens has a great focal length range of 24-70mm and designed for full frame DSLRs. Purchase options: Amazon | Adorama | B&H.Format : Full Frame / APS-C / Crop Sensor.Model name: Sigma 24-70mm f/2.8 EX DG HSM.Anything requiring spare parts or expert involvement would be liable to make the purchase non viable. Knowing if this was a common problem with this or similar lenses and what is typically required for repair would be interesting.ĭismantling and lubrication would be acceptable. It seems likely (but not certain) that dismantling and careful & sensible lubrication of the zoom bearing surfaces may effect an adequate improvement. This plus prior experience with other zoom lens dismantling suggests it is probably possible to dismantle the basic lens outer without causing major issues requiring recalibration and realignment. No noise is made when moving against the binding force and the action when the lens is vertical feels acceptable.Ī look for lens teardowns for this lens found some very simple procedures to access the "zoom bearing" (their term) for the HSM version. The binding is NOT harsh - it does not grate or "skip" - just stiffens. ie it appears that the "bearing or bearing surfaces are binding due to the lens weight but are free enough when no downward (ie sideways relative to long axis) is applied. Tilt the front upwards close to vertical and the stiffness vanishes. So much so that it can be almost impossible to move through this centre point when the lens is horizontal. The main defect is that the zoom action becomes stiff in the centre of the travel range. I've been offered a "somewhat wounded" Sigma 24-70mm f2.8 EX DG Macro (non HSM) Nikon mount lens at a price slightly around 33% - 50% of what I've seen them for on international sites (ebay and other). Such an answer MAY be able to be given by people who have met this sort of problem with this family of lenses, IF this is a typical fault in this lens series. What I really want to know is, what are the chances that if I buy it and pull it apart that I'll find that I can restore it to "within the range of normal" operation with a few hours of pottering, some suitable lubricant and perhaps a bit of bending. I've had some past successes with repairs which need only basic outer layer lens dismantling. issues which usually apply to general DIY attempts at lens repair. I'm aware of the usual expert-territory / realignment / hard / what is my time worth. I'm competent mechanically and comfortable "wandering around" in the outer layers of lenses in those areas where this does not affect alignment and require specialist equipment. I'm asking about the possibility of my personally repairing a specific possibly minor problem on a specific lens. Can anyone provide useful experience based comment on the potential for or cost of repair of the "zoom bearing" mechanism in this lens specifically or with lenses liable to be similar? My question is mainly a "is this a known problem with this lens or family of lenses and if so, is there often a known cause that is easily enough remedied".
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