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Latest Review Posted Sigma UC 28-70mm F3.5-4.5
My copy was essentially "free" as it came with a secondhand P30 that I bought to keep my Pentax film camera capability going into the future. In the multi-coated era there were few makers still producing 2-touch zoom lenses - but this Sigma was kept going up to the switch to autofocus. As so many 1-touch zooms are now sufferring terrible lens creep as the internal rubber seals and washers deteriorate, there is an added value in finding 2-touch zooms if the image quality is good enough for the task intended. For medium resolution work this lens is fine - for sure, there are problems when scaled up but remember this was a lens designed for home slide projection or "snapshot" prints - and it does that well...even today. In the modern era we can correct the barrel distortion at wide-angle in photoshop. At wide-angle in bright light we will be at f8-11, so any edge softness has gone. In dark exposures - the edge softness at wide apertures is less visible in your compositions. At the telephoto end - the edge softness with the aperture wide open works to help concentrate the composition on the centre or at the "intersection of the thirds"...and there is enough smooth "bokeh" to make it a useful composition effect. As with all zooms - there are lots of air/glass or glass/glass interfaces inside so it makes sense to get the best possible lens hood. In the digital era I find those 3-position rubber ones excellent as you can alter the positio...

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