D-FA 24-70 v 28-105 on K-1

**BarryE** · 09-28-2017, 02:33 PM

Was there a comparison of these two lenses ever made ? I read in the 28-105 staff review that it was to be done, but couldn't locate it. Apologies if I've missed it.

The 24-70 does seem to struggle at the edges, especially at the short and long ends of the range, and is heavy. Yes it has a constant f2.8 and its flare resistance is great, but I'm not enjoying using it. I wonder how much I'd lose swapping to the the lighter 'kit' lens and carrying primes to back it up.

Adam · 09-28-2017, 03:07 PM

Originally posted by BarryE

Was there a comparison of these two lenses ever made ? I read in the 28-105 staff review that it was to be done, but couldn't locate it. Apologies if I've missed it.

The 24-70 does seem to struggle at the edges, especially at the short and long ends of the range, and is heavy. Yes it has a constant f2.8 and its flare resistance is great, but I'm not enjoying using it. I wonder how much I'd lose swapping to the the lighter 'kit' lens and carrying primes to back it up.

We did a quick practical comparison here (look at the roof tiles):

HD Pentax-D FA 28-105mm F3.5-5.6 ED DC WR Review - Sharpness | PentaxForums.com Reviews

The TLDR is that the 24-70mm outperforms the 28-105mm, even wide-open, at the wide end. However, at 70mm the 28-105mm holds a considerable advantage.

At the end of the day the 28-105mm is no prime, but if you have a bag of primes to supplement the zoom when sharpness is paramount, then the 28-105mm will serve you well for everyday shots.

Kaisas · 09-28-2017, 04:33 PM

Actually i used 28-105 then returned it, but i can tell if u dont need f2.8 28-105 which is a nice lens.right now i have 24-70 im in love with the color.

biz-engineer · 09-28-2017, 10:32 PM - **1 Like**

Originally posted by BarryE

D-FA 24-70 v 28-105 on K-1

Size wise, DFA28-105 is better, good as a travel lens. With regards to image output, DFA24-70 is better. If I should sell one of the two, I'd sell the DFA28-105 as I find 24mm vs 28mm is a big deal practically.

**BarryE** · 09-29-2017, 02:09 AM

Originally posted by Adam

We did a quick practical comparison here (look at the roof tiles):

HD Pentax-D FA 28-105mm F3.5-5.6 ED DC WR Review - Sharpness | PentaxForums.com Reviews

The TLDR is that the 24-70mm outperforms the 28-105mm, even wide-open, at the wide end. However, at 70mm the 28-105mm holds a considerable advantage.

At the end of the day the 28-105mm is no prime, but if you have a bag of primes to supplement the zoom when sharpness is paramount, then the 28-105mm will serve you well for everyday shots.

Thanks Adam.

jackprt · 09-29-2017, 02:42 AM

I have DFA 28 105 and I wish it was DFA 28 300

**pres589** · 09-29-2017, 04:09 AM - **1 Like**

the 24-70 is more kenspo, the 28-105 is more normhead.

**Rondec** · 09-29-2017, 06:42 AM

Do you think you have a bad copy? The biggest problems I see with the DFA 24-70 are with some distortion and vignetting on the long end at f2.8. Both are pretty fixable and if you are shooting landscapes, stopping down takes care of it without problem. As biz-engineer says, there is a big difference between 24 and 28mm and for my style of shooting, having those extra 4 mm makes more difference than being able to go to 105 mm. I do think if you had DFA 15-30 you could get replace the 24-70 with the 28-105 without any difficulty.

normhead · 09-29-2017, 06:45 AM

Originally posted by pres589

the 24-70 is more kenspo, the 28-105 is more normhead.

I'm normhead and I approve this message.

The 24 of the 24-70 would be great, but the 28-105 is a great lens in it's own right. Especially with it's 3D rendering of landscape images. It brings something special to the table. We need two in our family, we both reach for it when we walk out the door, and Tess is using it on her K-5.

**Rondec** · 09-29-2017, 06:59 AM

I wouldn't think for landscapes there would be much difference. Most landscapes are shot between f8 and f14 and at those apertures most lenses (including the 24-70 and 28-105) are probably fine.

09-28-2017, 02:33 PM	#1
BarryE Site Supporter Join Date: Jan 2013 Location: Hampshire, UK Posts: 1,653	D-FA 24-70 v 28-105 on K-1 Was there a comparison of these two lenses ever made ? I read in the 28-105 staff review that it was to be done, but couldn't locate it. Apologies if I've missed it. The 24-70 does seem to struggle at the edges, especially at the short and long ends of the range, and is heavy. Yes it has a constant f2.8 and its flare resistance is great, but I'm not enjoying using it. I wonder how much I'd lose swapping to the the lighter 'kit' lens and carrying primes to back it up.

09-28-2017, 03:07 PM	#2
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,593	Originally posted by BarryE Was there a comparison of these two lenses ever made ? I read in the 28-105 staff review that it was to be done, but couldn't locate it. Apologies if I've missed it. The 24-70 does seem to struggle at the edges, especially at the short and long ends of the range, and is heavy. Yes it has a constant f2.8 and its flare resistance is great, but I'm not enjoying using it. I wonder how much I'd lose swapping to the the lighter 'kit' lens and carrying primes to back it up. We did a quick practical comparison here (look at the roof tiles): HD Pentax-D FA 28-105mm F3.5-5.6 ED DC WR Review - Sharpness \| PentaxForums.com Reviews The TLDR is that the 24-70mm outperforms the 28-105mm, even wide-open, at the wide end. However, at 70mm the 28-105mm holds a considerable advantage. At the end of the day the 28-105mm is no prime, but if you have a bag of primes to supplement the zoom when sharpness is paramount, then the 28-105mm will serve you well for everyday shots. Adam PentaxForums.com Webmaster (Site Usage Guide \| Site Help \| My Photography) PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating or purchasing one of our Pentax eBooks. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

09-29-2017, 06:45 AM	#9
normhead Pentaxian Join Date: Jun 2007 Location: Near Algonquin Park Photos: Gallery \| Albums Posts: 40,448	Originally posted by pres589 the 24-70 is more kenspo, the 28-105 is more normhead. I'm normhead and I approve this message. The 24 of the 24-70 would be great, but the 28-105 is a great lens in it's own right. Especially with it's 3D rendering of landscape images. It brings something special to the table. We need two in our family, we both reach for it when we walk out the door, and Tess is using it on her K-5. Last edited by normhead; 09-29-2017 at 06:55 AM.

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09-28-2017, 04:33 PM	#3
Kaisas Senior Member Join Date: Sep 2016 Posts: 121	Actually i used 28-105 then returned it, but i can tell if u dont need f2.8 28-105 which is a nice lens.right now i have 24-70 im in love with the color.

09-28-2017, 10:32 PM - 1 Like	#4
biz-engineer Pentaxian Join Date: Feb 2015 Photos: Gallery Posts: 12,225	Originally posted by BarryE D-FA 24-70 v 28-105 on K-1 Size wise, DFA28-105 is better, good as a travel lens. With regards to image output, DFA24-70 is better. If I should sell one of the two, I'd sell the DFA28-105 as I find 24mm vs 28mm is a big deal practically.

09-29-2017, 02:09 AM	#5
BarryE Site Supporter Join Date: Jan 2013 Location: Hampshire, UK Posts: 1,653 Original Poster	Originally posted by Adam We did a quick practical comparison here (look at the roof tiles): HD Pentax-D FA 28-105mm F3.5-5.6 ED DC WR Review - Sharpness \| PentaxForums.com Reviews The TLDR is that the 24-70mm outperforms the 28-105mm, even wide-open, at the wide end. However, at 70mm the 28-105mm holds a considerable advantage. At the end of the day the 28-105mm is no prime, but if you have a bag of primes to supplement the zoom when sharpness is paramount, then the 28-105mm will serve you well for everyday shots. Thanks Adam.

09-29-2017, 02:42 AM	#6
jackprt New Member Join Date: Feb 2017 Posts: 2	I have DFA 28 105 and I wish it was DFA 28 300

09-29-2017, 04:09 AM - 1 Like	#7
pres589 Site Supporter Join Date: Jan 2014 Location: Wichita, KS Photos: Albums Posts: 4,529	the 24-70 is more kenspo, the 28-105 is more normhead.

09-29-2017, 06:42 AM	#8
Rondec Loyal Site Supporter Join Date: Mar 2009 Location: Gladys, Virginia Photos: Gallery Posts: 27,650	Do you think you have a bad copy? The biggest problems I see with the DFA 24-70 are with some distortion and vignetting on the long end at f2.8. Both are pretty fixable and if you are shooting landscapes, stopping down takes care of it without problem. As biz-engineer says, there is a big difference between 24 and 28mm and for my style of shooting, having those extra 4 mm makes more difference than being able to go to 105 mm. I do think if you had DFA 15-30 you could get replace the 24-70 with the 28-105 without any difficulty.

09-29-2017, 06:59 AM	#10
Rondec Loyal Site Supporter Join Date: Mar 2009 Location: Gladys, Virginia Photos: Gallery Posts: 27,650	I wouldn't think for landscapes there would be much difference. Most landscapes are shot between f8 and f14 and at those apertures most lenses (including the 24-70 and 28-105) are probably fine.

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