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02-27-2016, 05:25 PM   #1
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Pentax 28-105mm f/3.5-5.6: HD D-FA any reviews yet?

Pentax D HD FA 28-105mm f/3.5-5.6 ED DC WR Lens Are there better ones out there?
Are there any reviews for this lens? is it just a cheap Kit lens?

02-27-2016, 05:35 PM   #2
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Apparently there were some sample photo taken with it on DP review which looked impressive. Obviously it would be a pentax designed/made lens since it uses a DC motor.
Hopefully its flare resistance is good. It and and a set of FA limiteds wouldn't be a bad piece of kit to have for the weight conscious!
02-27-2016, 06:42 PM   #3
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The 28-105 is meant to be the cheaper alternative to the 24-70 F2.8.

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02-27-2016, 06:59 PM   #4
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QuoteOriginally posted by Adam Quote
The 28-105 is meant to be the cheaper alternative to the 24-70 F2.8.

Do you know if there is a huge difference in image quality?

02-27-2016, 07:12 PM   #5
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Probably not, the zoom ranges are both under 1:4, but 2.8 in the long end compared to 5.6. I always say if you can't fake a stop, you aren't a photographer, but that's two stops.
02-27-2016, 07:29 PM   #6
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QuoteOriginally posted by normhead Quote
Probably not, the zoom ranges are both under 1:4, but 2.8 in the long end compared to 5.6. I always say if you can't fake a stop, you aren't a photographer, but that's two stops.

Ok well thats good to know if thats the case.
02-27-2016, 07:54 PM   #7
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Of course, i go everywhere with my 18-135 on the camera for APS-c... fast zooms are so heavy.

I like to cover as much range as possible with zooms and then go for primes. 28-105 is a nice range. It's bound to be WR and a fast ring motor. If it's got decent macro, that's the way I'd probably go myself. Then in the FLs I use most I like to get nice light primes. I tend to dislike both the weight and cost of ƒ2.8 lenses.

Last edited by normhead; 02-28-2016 at 06:42 AM.
02-27-2016, 10:12 PM   #8
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A couple of the official K-1 sample images were shot with the 28-105 kit lens, including the very impressive pixel-shift example. If the lens was trash, I don't think Ricoh would be using it to officially highlight the K-1. So I think it's going to be a decent lens.

Plus if you look at the features and specs of the lens, including it's MTF charts, it looks like it will be sharp enough.

HD PENTAX-D FA 28-105mmF3.5-5.6ED DC WR / K-mount Lenses / Lenses / Products | RICOH IMAGING


Last edited by rawr; 02-27-2016 at 10:27 PM.
02-27-2016, 10:49 PM   #9
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QuoteOriginally posted by Fcsnt54 Quote
Do you know if there is a huge difference in image quality?
We'll have to wait for the reviews to come in

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02-28-2016, 01:14 AM   #10
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QuoteOriginally posted by Big Dawg Quote
Pentax D HD FA 28-105mm f/3.5-5.6 ED DC WR Lens Are there better ones out there?
Are there any reviews for this lens? is it just a cheap Kit lens?
Spectacular results on the official pixel-shift flower photo. I was astonished.
02-28-2016, 01:31 AM   #11
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QuoteOriginally posted by Adam Quote
We'll have to wait for the reviews to come in

The suspense.....
02-28-2016, 02:54 AM   #12
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In the past, Pentax made some of the worlds best 28-105 lenses - so chances are good that the new 28-105 is a really good lens. 28-105 has never been a "cheap kit lens" from Pentax. Well maybe a kit lens yes but not cheap and poor.

Pentax first fantastic 28-105 was the FA 28-105 f/4-5.6 (power zoom) it won high praises in magazine for flare control and nice image quality - it was actually better than the FA 28-80 (power zoom) and one could get it in a kit with the Z-1/PZ-1 (Pentax high-end AF camera in the mid 90's). A good standard zoom for everyday shooting.

When the MZ-serie came along, Pentax re-badged the Tamron 28-105 f/4-5.6 AL (IF) - manual zoom - while working on their own design for a new 28-105. Now the Tamron re-badge wasn't as good as the power zoom version, but still good.

Then Pentax finally came out with the excellent, and also compact and light, FA 28-105 f/3.2-4.5 AL (IF) - which I used to have as standard lens on my MZ-5N.
This was an excellent lens, actually better than the good FA 28-70 f/4 AL. Performance at 105 was a bit weak and soft at the edges but center sharpness was excellent.

With this nice heritage, I have no reason to believe that the new D FA 28-105 is a poor lens. It has a DC-motor, it is weather resistant and it has a very advanced optical construction that's - on the paper - is very impressive compared to Pentax earlier 28-105 efforts.

The new D FA 24-70 f/2.8 is probably of an even higher class, it's twice as expensive... and f/2.8 zooms are pro-grade.
02-28-2016, 06:38 AM   #13
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QuoteOriginally posted by RMabo Quote
The new D FA 24-70 f/2.8 is probably of an even higher class
Indeed. But noting that I'm not a MTF expert (so pls don't kill me if I am wrong), if you look at the MTF charts for both the new 24-70 and the 28-105 on the Pentax site, to me it looks like the 28-105 kit lens may outperform the 24-70 in some circumstances.
02-28-2016, 06:46 AM   #14
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QuoteOriginally posted by rawr Quote
Indeed. But noting that I'm not a MTF expert (so pls don't kill me if I am wrong), if you look at the MTF charts for both the new 24-70 and the 28-105 on the Pentax site, to me it looks like the 28-105 kit lens may outperform the 24-70 in some circumstances.
That would be nice, you should be able to use some of the design currency of making lenses 2.8 to increase the MTF of ƒ4 and lower lenses. It would be nice if that were the case. Certainly when you look at the 200 ƒ4 macro it's pretty hard to argue with that strategy, just from an MTF viewpoint. 2.8 lenses are more expensive cause they are 2.8, require twice the glass and manufacturing time and materials as an ƒ4 lens. But, my 60-250 ƒ4 stacks up nicely against a DA*200 ƒ2.8 on the charts. An expensive 2.8 lens is definitely the best shooting at ƒ2.8... there's absolutely no guarantee it's better at ƒ4 or anywhere else. You look at the numbers for my $300 DA 18-135 and $900 DA*16-50, and you could easily come to the conclusion you're wasting your money on the DA* if you don't need ƒ2.8. Especially since the ring motor in the 18-135 pretty much kicks the SDM's but.

You need some fast lenses. Whether or not they should be fast zooms is another question completely. The weight of fast zooms, and the concept of a "field camera" are almost contradictory design criteria. It's great Pentax is providing some 2.8 zooms for the pro market, weddings and other event photography, but they will never be "bread and butter" lenses, nor should they be. They are specialty lenses, for those with specific needs. Why would someone suffer with a 16-50 2.8, when they have both a 50 1,7 and a 35 2.4? They'd be giving up speed and IQ and weight.

Last edited by normhead; 02-28-2016 at 07:29 AM.
02-28-2016, 07:24 AM   #15
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I clicked on the sample image of the hillside town to bring up the high-res image, then clicked to enlarge here and there, for example on one of the cars at the bottom of the image. The IQ seems to be very good to excellent and would survive some pretty deep cropping before the image began to look soft.
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