Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
08-02-2007, 07:16 AM   #1
Pentaxian
raider's Avatar

Join Date: Jul 2007
Location: Perth, Australia
Photos: Gallery
Posts: 1,931
Sigma 18-50 f2.8 vs pancake primes

I have a silly question.

The pancake primes are 31mm, 21mm, 40mm, etc. Their f-stop are slightly better but would not the Sigma 18-50/f2.8 cover this entire range already, albeit f-stop a bit higher?

Is this a more economical way of getting lenses that can perform well in indoor lighting? Any compelling reason to buy the pancake lenses instead of the sigma?

08-02-2007, 08:08 AM   #2
Senior Member




Join Date: Jan 2007
Location: Dahlonega, GA
Photos: Gallery
Posts: 141
Well, first, the "Pancake Stack" is 21/f3.2, 40/f2.8 and 70/f2.4. The 31/f1.8 is the old FA Limited (and an EXTREMELY desireable lens!). While you have to answer this for yourself, you should find lens tests on the web of these AND the Sigma. www. pixelpeepers.com is a good place to start to see "real world" photos with these and other lenses.
Why not consider the new *16-50/f2.8 from Pentax? While more expensive than the Sigma, it's performance is already winning raves. Go to Ned Bunnell's blog: NED BUNNELL (He's the PR director for Pentax USA) and look at his photos made with it. You can also go here: OK1000 Pentax Blog and compare both of the new Pentax * Da lenses.
Sigma's have consistently had a spotty quality reputation over the last few years. You might get one that is as good as Pentax Limiteds and * lenses, or you might get the junk yard dog of lenses, and you never know until you start shooting with it! Caveat Emptor! "Let the buyer beware!"
Just my 2 cents!
Rob W
08-02-2007, 08:15 AM   #3
Senior Member




Join Date: May 2007
Location: Toronto, Canada
Photos: Gallery
Posts: 168
It also comes down to what you commonly feel you would use. Do you shoot a specific range and don't like to deviate from it? Are you the type who prefers to zoom with their feet instead of their lens? If so, primes might be your cup of tea. If you're looking for convenience, not having to swap lenses and figure that you'll shoot at the range between 18-50 and never really use just one length, then a zoom might be your cup of tea.

The DA * 16-50 is nice and achieving rave reviews, but at a third of the price you can get a 17-70 Sigma f2.8-f4.5 (quite a good range and f stop) which has garnered great reviews as well. Decisions, Decisions, Decisions
08-02-2007, 08:51 AM   #4
Senior Member




Join Date: Apr 2007
Location: Barbados
Photos: Gallery
Posts: 270
I am getting the older non macro version of the sigma. It is just for some event photography and honestly, I don't think I need such an expensive lens for that.

Lens Test: Sigma 18-50mm f/2.8 EX DC Macro - - PopPhotoMay 2007

The sigma is PLENTY sharp and more than adequate for events.

08-02-2007, 04:49 PM   #5
Pentaxian
raider's Avatar

Join Date: Jul 2007
Location: Perth, Australia
Photos: Gallery
Posts: 1,931
Original Poster
If sigma has a QC issue, is it better to get the Tamron 17-50mm f2.8? I am sure I saw this tamron lens somewhere on the net....

Does Tamron has the same inconsistent QC issue as Sigma?
08-02-2007, 04:55 PM   #6
Veteran Member
FotoPete's Avatar

Join Date: Feb 2007
Location: Toronto
Photos: Gallery
Posts: 1,710
How can you compare a 'budget' fast zoom to a couple of premium primes?

(I know the word premium doesn't mean much considering any of the K and M series can be easily compared to the line of Limiteds..build quality in particular...Limiteds being be the cream of the crop today.)

If you want convenience/on a budget/need AF, go for the 18-50/17-50.

If you want the IQ, Image contrast, bokeh, compactness, metal body, and have the $$, go for the Limited primes.
08-02-2007, 05:01 PM   #7
Pentaxian
raider's Avatar

Join Date: Jul 2007
Location: Perth, Australia
Photos: Gallery
Posts: 1,931
Original Poster
Well, I don't have the $$$ So I have not much choice but to steer away from limited primes and attack the zoom. Is the sigma or tamron better in QC?
08-02-2007, 05:04 PM   #8
Veteran Member
FotoPete's Avatar

Join Date: Feb 2007
Location: Toronto
Photos: Gallery
Posts: 1,710
Personally, I'd spend the $400-500 and get a couple fast manual zooms instead. :P

As for a direct comparison between the Sigma and Tamron, I suggest you hop over to photozone.de and check their lens reviews. Very detailed and concise. They'll be under the Canon and Nikon sections.

08-02-2007, 07:02 PM   #9
Senior Member
jslifoaw's Avatar

Join Date: Apr 2007
Location: Toronto/Victoria
Posts: 262
QuoteOriginally posted by raider Quote
Well, I don't have the $$$ So I have not much choice but to steer away from limited primes and attack the zoom. Is the sigma or tamron better in QC?
It's extremely unpredictable.

I had a Sigma 28-80 which I paid $20 for, and I swear it matched the Pentax 24-90 in terms of sharpness (less so in build and colour) and came awfully close to primes.

I also had a more expensive Sigma 28-105 to replace my Pentax 28-105 (yes, Sigma replacing a Pentax), and they were both blurry in one corner (or quadrant--that's how bad they were), and neither Sigma nor Pentax really tried hard to fix them.

If you do go with a zoom, make sure you hand-pick, i.e. you try them in the store and take the first one which no alignment issues.

In part because of my shooting style and in part because of my zoom experiences, I shoot all primes of all generations as I have greater confidence in their reliability and shooting performance.
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
f-stop, k-mount, lenses, pancake, pentax lens, primes, sigma, sigma 18-50 f2.8, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Sigma & Pentax Primes 15-30mm Christopher M.W.T Pentax SLR Lens Discussion 3 02-28-2010 05:50 PM
Sigma 30mm/1.4 VS any other f1.8 Sigma primes pcarfan Pentax SLR Lens Discussion 32 01-17-2010 08:46 AM
Dilemma: Pentax 70 pancake or Sigma 70 macro? WMBP Pentax SLR Lens Discussion 31 10-01-2009 03:36 PM
For Sale - Sold: FS: Pentax Primes and Sigma TCx2 anthonysemone Sold Items 3 10-15-2007 02:01 PM
Pancake vs. Classic Limited Primes macdaddy Pentax SLR Lens Discussion 7 02-18-2007 06:51 AM



All times are GMT -7. The time now is 04:38 AM. | See also: NikonForums.com, part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top