Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
05-22-2013, 09:50 AM   #1
Inactive Account

Join Date: Jun 2011
Location: Fresno, CA
Photos: Gallery
Posts: 50
Should I trade my 50mm 1.4 for a 30mm 1.4?

50mm is a Pentax and 30mm is the sigma. I heard you can shoot wide open on the sigma and the shots I've seen are amazing. I shoot with a K-r and have have 1/12 hit ration shooting wide open with the 50.

Anyways I just bought a 10-17mm so I've reached my wife's lens limit for the year, but really want this 30. Should I do it? If so, anyone wanna trade?

05-22-2013, 11:46 AM   #2

Join Date: Sep 2009
Location: Southern California
Photos: Gallery | Albums
Posts: 3,181
I assume that's the FA50/1.4 you're taking about. It's not like it's hard to find another one, and it isn't so special that you could be giving up an "awesome" copy. So you should trade it if you're interested in trying the Sigma 30/1.4.

I trust that selling it and then buying the 30 elsewhere still counts as a trade - much easier!

Last edited by DSims; 05-22-2013 at 11:53 AM.
05-22-2013, 11:59 AM   #3
Kozlok's Avatar

Join Date: Jun 2012
Location: Albuquerque
Photos: Gallery
Posts: 1,793
One caveat, the Sigma is very prone to front/back focus. If you buy a used one, make sure it is still under warranty, and you get the original receipt, and then Sigma will calibrate it to your KR for free. It makes a huge difference. You may want to ask Sigma the price of the calibration service BEFORE you buy a lens without the original receipt.

If you shoot outdoors, keep the 50. Indoors, the 30 is super, and the 50 is too long.
05-23-2013, 12:14 AM   #4

Join Date: Nov 2008
Location: Bangalore
Photos: Gallery
Posts: 2,450
I have both, I love Sigma 30mm for street shots but I reach for 50mm and longer for portraits. So I wouldn't trade one for another. 50mm does street too so for me it's more versatile focal length.

05-24-2013, 11:35 AM   #5
Na Horuk's Avatar

Join Date: Feb 2012
Location: Slovenia, probably
Photos: Gallery | Albums
Posts: 10,864
Hm, keep in mind that the difference between the two lenses isn't just FoV and sharpness. They render quite differently, especially OoF highlights (triangular bokeh?). And they might have differences in AF speeds.. But the 30mm might be more useful on APS-C. Just depends what you usually photograph.
You can also think about Pentax options in that focal length, like the FA 35mm f2.0, DA 35mm f2.4, DA 35mm f2,8 ltd., DA 40mm f2.8 ltd/XS,.. Even the 21mm, some people really like that focal length.
QuoteOriginally posted by randesigns Quote
I shoot with a K-r and have have 1/12 hit ration shooting wide open with the 50.
That's a bit low. Try AF adjust, try live view focusing.. maybe improve your focusing technique, try faster shutter speeds? Maybe its the lens, and an exchange would in fact help you. Or is it just because the DoF is too shallow at f1.4?
05-24-2013, 11:46 AM   #6
Veteran Member
scratchpaddy's Avatar

Join Date: Feb 2013
Location: Phoenix
Posts: 2,360
I have both, and I agree with the others here. One lens is not a replacement for the other. The FA50 has the smoothest bokeh I've ever seen, and the colors are warm and pleasant, so it's well-suited for portraits. The Sigma, because of the "normal" focal length, is more of a general-purpose lens. It's sharper in the center than the Pentax, but corners are very soft, and it vignettes heavily at wide apertures. The Pentax, with it's film-era coatings, is prone to purple fringing. The Sigma's bokeh is much more energetic, but not necessarily unpleasant.

That said, I use the Sigma far more than the Pentax. If you have to get rid of the FA50 to get the Sigma, do it. It's an amazing lens.

  • 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!
30mm, 50mm, k-mount, pentax lens, sigma, slr lens, trade
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
Should I get A50/1.2 if I already have Voigtlander 58/1.4 chesebert Pentax SLR Lens Discussion 6 04-17-2013 06:50 AM
Should I sell DA*55mm 1.4 and get a DA 50mm 1.8? junototoro Pentax SLR Lens Discussion 11 03-02-2013 08:59 AM
For Sale - Sold: K5 + sigma 30mm 1.4 + tamron 17-50mm 2.8 + pentax M 50mm 1.7 ueda_masaki Sold Items 5 09-25-2012 12:09 PM
Should I return my Sigma 50mm 1.4 HSM ? icypepsi Pentax DSLR Discussion 47 03-31-2011 10:11 AM
Should I sell my smc 50mm fa 1.4 68wSteve Pentax SLR Lens Discussion 8 03-01-2009 11:59 PM

All times are GMT -7. The time now is 09:35 PM. | See also:, 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?
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]