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Sigma 24-135mm F2.8-4.5
Latest Review Posted Sigma 24-135mm F2.8-4.5
This is the lens that I use most on my *ist DL. I had considered the Sigma 18-125 but was put off by its poor IQ and APS-C-only image circle. All of the sample images I saw from the 24-135 looked great.


The best aspects:
Moderately fast - I have shot outdoor events at night in available light (downtown.) Because of the variable maximum aperture, you must shoot wide (24mm) to maintain f/2.8.


Excellent build quality - this is a sturdy lens, with a similar feel and construction to EX lenses. It inspires confidence. The included petal hood is sturdy and handsome. Zoom and focus have smooth action, with wide enough rings to easily grasp. Lens cap needs to be exchanged for a Tamron-style centre grip cap to allow it to be removed when the hood is on the lens.


Good IQ, even wide open. Very sharp by f8. Good corner to corner sharpness and lack of vignetting throughout the range. Nice bokeh from 9 bladed aperture. Nice colour rendition, very comparable to my Pentax FA 28-90, and warmer than my Pentax FAJ 18-35.


Lens creep is an issue if you wear the camera on the street. The substantial weight and size of the lens ensure that it will slowly double in size if you don't baby it.


This is not a light-weight lens. Packing a 24-135 range into a full frame lens that achieves 2.8 (however briefly) means there is quite a bit of glass. Filter size is 77mm, on the large end of commonly available filters, which can get expensive.


Focus speed is reasonable, but not the fastest. C...



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