Originally posted by NaClH2O The obvious answer is the Pentax 16-45mm. It's a constant aperture f4.0, and much better build quality. Since you are considering the Sigma 28-70, f2.8, you also might want to consider the Tamron 28-75 f2.8, I do not own the lens myself but everybody I know who has one swears by it. I'm very seriously considering getting it myself. You will lose a fair amount of FOV over the 16-45, but you do gain two stops.
I thought about mentioning the 16-45, which I also have. I'd say to Toonahfish that there are three questions to consider here.
- What matters more to you, getting a bit more on the wide end, or a bit more reach on the telephoto end?
- How important is it to you to have that f/2.8 aperture for lower-light photography?
- How many lenses can you afford?
The first question is absurd if you think of it in connection with a specific shot. For a specific shot the answer will always be, I want the right lens for THIS shot. But I ask the question generally. What kind of photos do you tend to take? If you shoot a lot of close-up group photos, or you like to shoot buildings from across the street, and if you tend to shoot in good light or can at least use flash, well, then the 16-45 might be the right lens to buy first. But I myself don't use the 16-28 focal lengths NEARLY as much as I use the 45-75 range. Taking a wild guess, I'd say that 75% of my photos are taken at a focal length above 45mm. THAT'S JUST ME. I bet that our esteemed forum buddy Ben Kanarek shoots 75% of the time BELOW 45mm. But knowing where you need to shoot makes a difference to which of these lenses you buy - or buy first.
Me personally, I'm thinking about selling the 16-45, if I can get the right price. Optically, it's a really excellent lens, no question. But I simply don't find myself using it as much as the two Tamrons that I mentioned in my earlier response. The 28-75 (like the Sigma 28-70) isn't as wide, true, and sometimes that's significant. I was shooting an event six weeks ago where I started with the 28-75, then switched to the 16-45 because I needed to shoot a wide group shot and I was having trouble getting everybody in at 28mm. The 28-75 also isn't quite as sharp at its best as the Pentax 16-45 at its best. But for me, the difference in quality is not major, and the versatility of the Tamron 28-75 f/2.8 trumps the possibly greater acuity of the Pentax 16-45. I can go down to 18mm with my other Tamron. And when that's still not wide enough, well, what I hope to do sooner or later is get a proper wide-angle lens like the Sigma or Pentax 12-24mm offerings.
By the way, I just noticed for the first time that Pentax lists on its web site an
smc-p FA J 28-80 lens f/3.5-5.6 that is dirt cheap (under $100). I have no experience with or knowledge of the lens at all, but gosh, how bad could it be? Could it be worse than the 18-55 kit lens?
Will
Last edited by WMBP; 06-20-2007 at 10:56 AM.
Reason: fixed couple of misspellings