Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
01-19-2010, 11:06 AM   #1
Senior Member
geezer52's Avatar

Join Date: Jul 2009
Location: High Desert, California
Photos: Gallery
Posts: 231
Sigma 70-200mm 2.8 versus the Pentax 55-300mm

This isn't the normal compare and contrast question. I have the Pentax lens and like the long reach. What I'm wondering is if the IQ of the Sigma (or Tamron equivalent) is so much better, that cropping an image taken at 200mm is better than a similar sized image taken at 300mm with the Pentax. That is cropping the images so the end result from each lens is the same physical size.

I realize there are a slew of other considerations but was specifically wondering about this.

Also are there any teleconverters known to work well with the 55-300?

01-19-2010, 11:11 AM   #2
Pentaxian
Lowell Goudge's Avatar

Join Date: Jan 2007
Location: Toronto
Photos: Gallery | Albums
Posts: 15,400
I have posted a lot of shots with my APO 70-200 F2.8 EX (non DG non macro) with a 2x TC.

I find it hard to beat

see samples below all of which I have posted previously.

you will enjoy the extra speed both with and with out the TC compareed to your present lens.

Note the Whooping crane is about 10% of the sensor area out of a K10D, the other 2 shots are the full frame





01-19-2010, 11:39 AM   #3
Loyal Site Supporter
imtheguy's Avatar

Join Date: Mar 2009
Location: Virginia Beach
Photos: Gallery | Albums
Posts: 2,950
I have tried a couple of TCs with my DA55-300mm just for fun and the biggest problem is the IQ suffers too much. Even with a Tamron 1.4x that gives me sharp results with a DA*300, the zoom (as expected) can't keep up. The 2x TC was of course a joke but had to try.
01-19-2010, 11:47 AM   #4
Ash
Community Manager
Loyal Site Supporter
Ash's Avatar

Join Date: Mar 2007
Location: Toowoomba, Queensland
Photos: Gallery | Albums
Posts: 22,695
There's no question that the 55-300 is no match for a fast telezoom like the 70-200 with a 1.5x TC for a 300mm equivalent. The extra stop garnered from the 70-200 + TC combo does more than just give shallower DoF - and the IQ is simply hard to beat, even for the 55-300 which is really a very good consumer lens in this department.

You can certainly forget using a TC with the 55-300 - it'll work but is quickly seen to be a fruitless venture when tried.

01-19-2010, 11:49 AM   #5
Pentaxian
Lowell Goudge's Avatar

Join Date: Jan 2007
Location: Toronto
Photos: Gallery | Albums
Posts: 15,400
QuoteOriginally posted by imtheguy Quote
I have tried a couple of TCs with my DA55-300mm just for fun and the biggest problem is the IQ suffers too much. Even with a Tamron 1.4x that gives me sharp results with a DA*300, the zoom (as expected) can't keep up. The 2x TC was of course a joke but had to try.
But you are not really comparing the same quality of lens, the DA 300F4 I would expect to be a top notch lens, like my Sigma 70-200F2.8. the DA 55-300 is really a consumer level lens.

This does not mean it is junk, obviously, but all the same, it is not intended to be used as seriously as the DA300F4.
01-19-2010, 12:56 PM   #6
Veteran Member
Pentaxor's Avatar

Join Date: May 2009
Location: Vancouver, B.C.
Photos: Gallery
Posts: 6,513
QuoteOriginally posted by geezer52 Quote
This isn't the normal compare and contrast question. I have the Pentax lens and like the long reach. What I'm wondering is if the IQ of the Sigma (or Tamron equivalent) is so much better, that cropping an image taken at 200mm is better than a similar sized image taken at 300mm with the Pentax. That is cropping the images so the end result from each lens is the same physical size.

I realize there are a slew of other considerations but was specifically wondering about this.

Also are there any teleconverters known to work well with the 55-300?
hmmm.....as far as I know, you will lose some amount of resolution as you crop and blow up a 200 focal length image inorder to replicate a 300mm focal length image.

regarding the 55-300, as far as TC versus cropping is concerned, cropping renders the better images rather than using a TC.
01-19-2010, 01:08 PM   #7
Veteran Member
Pentaxor's Avatar

Join Date: May 2009
Location: Vancouver, B.C.
Photos: Gallery
Posts: 6,513
I suppose that the OP is better off buying a 300mm prime lens if that were the case. though a Tamron 70-200/2.8+TC or cropped I believe would be more of a cheaper, ideal, practical and useful investment. for 700 bucks total, he could have a fast lens with a great IQ and a nice perfectly matched Tammy 1.4 TC. I suppose that the Tamron results whether used with a TC or cropped would display a much more better or excellent overall image result inspite of losing a bit of resolution due to cropping or addition of a TC.

as far as the word of mouth goes, I would prefer getting the Tamron over the Sigma.
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!
image, k-mount, lens, pentax, pentax lens, sigma, sigma 70-200mm, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Pentax 55-300mm versus Sigma 70-300mm DG APO Macro mazdamazda Pentax SLR Lens Discussion 49 07-27-2010 12:46 AM
DA 50-200mm Versus DA 55-300mm NecroticSoldier Pentax SLR Lens Discussion 5 03-26-2010 06:20 AM
Sigma 100-300mm f/4 versus Pentax DA* 60-250mm f/4 CWyatt Pentax SLR Lens Discussion 5 03-05-2010 01:13 PM
Sigma 100-300mm f/4 versus Pentax DA* 300mm f/4 Tbear Pentax SLR Lens Discussion 5 03-26-2008 07:24 PM



All times are GMT -7. The time now is 01:22 AM. | See also: NikonForums.com, CanonForums.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