Originally posted by CrazyNuts Hi Everyone
I currently own a Sigma EX DG 18-50mm f/2.8 lens and am considering selling that and going the Pentax lens instead.
I am just wondering if I will notice ANY benefit at all.
Is the Pentax lens a Macro like the Sigma?
Does the Pentax focus any faster?
Is the IQ any better than the Sigma?
I have gone exactly the same route, just that I also kept the Sigma - which is a lucky incidence, as my Pentax gave up mechanically after four months and is in repair...
There are three advantages of ther Pentax DA over the Sigma:
1. it is noticeably wider with 16mm minimum fl. This saves a lot of lens changing for me.
2. the feel of the lens is certainly that of better built. But as reality shows, the Sigma never broke down, the Pentax did.
3. the SDM is really silent. I value that highly.
The advantages of the Sigma (I have the older non-Macro version) are:
1. low price
2. smaller with smaller filter thread (67mm compared to the Pentax' 77mm)
3. robust
In terms of sharpness I cannot find much of a difference. In terms of contrast they are also pretty much en par.
There is a slight difference in colour rendition. But I guess, this is highly subjective and I did not do any measurements. So I find the Pentax delivers slightly more vivid and pleasing colours. But nothing one could not adjust with presets during RAW-processing.
The wider angle of the Pentax and the silent operation were worth the investment for me, but that does not say, that it is a "better" lens. On the other hand, the Sigma is easier to carry around and takes up less space in the photo bag, which can be an advantage of its own.
Ben