Review 3 of 51
Price Paid:
$120.00 Summary: Consumer Sigma lenses aren't the best lenses on the market at any price, and I have churned through a lot of different brands looking for happiness at various price ranges. However, I keep being tempted back to sigma for the unbeatable value for money they generally offer.
Up until recently, I thought this particular lens was the sharpest zoom I owned.
Many of the prints I have taken (moderate enlargement) have been generally stunning; and this was often with fuji 400 consumer film. The autofocus is acceptable for a zoom of this price range (on Pentax body), but ideally a tripod needs to be used in all but the brightest light for the latter half of the zoom range. It does hunt in low light.
Some other reviewers have stated that sharpeness is poor. I feel that they either have a patchy unit or are not using a tripod enough (and Sigma do have lemons - I recently got rid of a short sigma zoom that had the most unacceptable flare of any lens I've used - yet other reviewers have commented on great flare control with this lens..?.).
I find sharpness more than acceptable right through the range, with perhaps some softening at the long end; but still not bad. That said, I rarely ever shoot wide open with this lens; I nearly always stop down to at least f.6.7-f8.0 to hit the sweet spot. If you need to shoot mainly wide open, this lens may not suit you.
I mainly use the 70-200mm zone for taking people shots, at which point the shots are usually very good. I can't comment on distortion as it is not that important with the type of photos I take.
I bought this lens dirt cheap and as a result would have been satisfied with adequate performance. I have been consistently surprised, however, by the balanced and saturated colors, superb contrast and pleasing bokeh achieved with this lens.
Back to my initial comment; "Up until recently, I thought this particular lens was the sharpest zoom I owned...".
I recently performed resolution tests on all the lenses I owned to simplify my collection (test: samples of different sized print next to a pitted marble urn. A section was backlit slighty to add a potential flare factor - different focal lengths and aperatures were tested). Result: Much to my astonishment, this lens turned out to be slightly LESS sharp than ALL the other lenses (flare was well controlled though).
My conclusion:
To me it seems that there is more to perceived or subjective sharpness than just the optical sharpness of the lens. I suspect that the relatively outstanding contrast, color saturation and balance of this lens combines to define edges better, thus compensating for relatively slight deficits in absolute optical sharpness (I suppose much like unsharp mask with digital).
Nevertheless, after 2 years I am still absolutely stoked with the performance of this lens. I choose to judge its worth purely by the many superb (even "wow") images it has produced for me. On this basis I feel there is no other tele-zoom that offers so much for so little money.
Strengths: - Cheap, great value
- Superb contrast
- Great color balance and saturation
- Macro is OK, handy feature
- Sharp enough Weaknesses: - Autofocus can hunt a bit in low light (minor criticism considering the price)
- Will not close autofocus in Macro mode (needs nearly a metre from the subject) Similar Products Used: Sigma 28-80mm
Sigma 24-70mm HF
Sigma 24-135mm f2.8-4.5
Pentax FA 28-105mm f3.2-4.5
Pentax FA 50mm f1.7
Pentax M 50mm f1.7
Customer Service: Haven't used, though I believe quite good in Australia
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