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12-22-2011, 04:37 AM   #1
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FA 28-70 f/4 vs FA 28-105 f/4-5.6 PZ?

I currently have the FA 28-70 f/4 and eyeing a nicely-priced FA 28-105 f/4-5.6 PZ being sold locally.

I could do well without the extra zoom range and the PZ since I only have a K-x, but if it's got better IQ then I'm getting it immediately.

What do you guys say? Would it be worth it?

12-22-2011, 05:11 AM   #2
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The FA28-70 constant f4 is a truly great lense despite
being a kitzoom and of plastic construction. While the 28-105 is suposedly the best non-* power zoom I doubt it is on par with the 28-70. But if the price is right, try it out.
12-22-2011, 05:42 AM   #3
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I just got the Tamron 28-105 AF myself. It is surprisingly sharp and fast to AF. Havent put it through its paces yet so I cant comment on flare or tough shooting circumstances. I have read that the SMC version is less prone to flare than the Tamron.
12-22-2011, 08:56 AM   #4
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The PZ version is quite heavy compared to the other 28-105s.

12-22-2011, 12:30 PM   #5
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QuoteOriginally posted by Docrwm Quote
I just got the Tamron 28-105 AF myself. It is surprisingly sharp and fast to AF. Havent put it through its paces yet so I cant comment on flare or tough shooting circumstances. I have read that the SMC version is less prone to flare than the Tamron.
SMC version? You are talking about an entierly different lens construction.
12-22-2011, 12:48 PM   #6
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QuoteOriginally posted by Douglas_of_Sweden Quote
SMC version? You are talking about an entierly different lens construction.
Nope. The Pentax is a rebagged Tamron 28-105 with Pentax coatings.

https://www.pentaxforums.com/userreviews/tamron-af-if-28-105mm-1-4-5-6.html
12-23-2011, 09:33 AM   #7
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QuoteOriginally posted by Douglas_of_Sweden Quote
The FA28-70 constant f4 is a truly great lense despite
being a kitzoom and of plastic construction. While the 28-105 is suposedly the best non-* power zoom I doubt it is on par with the 28-70. But if the price is right, try it out.
hmm the one I'm looking at is the powerzoom version, the first of the three... could it be just as good as the 28-70 f4?

QuoteOriginally posted by Just1MoreDave Quote
The PZ version is quite heavy compared to the other 28-105s.
yes, that's my primary worry also. if its IQ isn't worth the neck strain guess i'll back out of the deal
12-28-2011, 07:02 AM   #8
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QuoteOriginally posted by Docrwm Quote
Nope. The Pentax is a rebagged Tamron 28-105 with Pentax coatings.

Tamron AF (IF) 28-105mm 1:4-5.6 Lens Reviews - Tamron Lenses - Pentax Lens Review Database
I'm afraid you are mixing things up. First of all, even if it was the same lens, "It is quite likely this is the same lens as the SMC Pentax-FA 28-105mm F4-5.6 [IF] Designed by Tamron." is hardly a certain source.


However, the OP talks about the FA 28-105/4-5.6 PZ (powerzoom) 13:11 lens solution from 1992, which was the longer normal zoom with powerzoom, and the one with best reputation, not counting the FA*'s. You are talking about the FA28-105/4-5.6 IF (internal focus) 15:11 lens solution from 1999.

1992 PZ version:



1999 IF version:


The later may very well be of Tamron design, or Pentax design rebagged to Tamron, or another design rebagged to both. But that is out of the topic here.


Here is what Stans Pentax Photography site has to say about the PZ 28-105 (short versinon):

"28-105 f/4.0-5.6 FA (p) Ralf Engelmann - Probably the best standard zoom in the current program, very good optics, excellent 1:3 macro ability, mechanically good, but without the powerzoom it could be even better. A bit large for the new MZ-series bodies.
David (ZX5Lx) - . . .The Pentax FA 28-105 f4-f5.6 is an excellent lens optically, with weakness just at 28mm wide open. . . fairly well built and the power zoom works perfect. . .
Rubenstein, Bruce M - . . . If I was limited to one lens, that would be it . . . can deliver excellent pictures only 1 stop down, and very good ones wide open; . . . [it] is a bit large and heavy for its size, and I think the power zoom is a waste, but it's a very good lens.
Marc Polman - . . . low distortion levels and vignetting for it's class. The optical performance is not bad either. The short focussing distance is a real bonus!
John Francis - . . . arguably the best consumer-grade 28-105 on the market. . .
John Coyle - . . . may be the best all-round general purpose lens to be had. . ."

12-29-2011, 10:01 PM   #9
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QuoteOriginally posted by Douglas_of_Sweden Quote
However, the OP talks about the FA 28-105/4-5.6 PZ (powerzoom) 13:11 lens solution from 1992, which was the longer normal zoom with powerzoom, and the one with best reputation, not counting the FA*'s. You are talking about the FA28-105/4-5.6 IF (internal focus) 15:11 lens solution from 1999.

The later may very well be of Tamron design, or Pentax design rebagged to Tamron, or another design rebagged to both. But that is out of the topic here.
Just got the lens. It seems better built than I had first thought (though the copy I got had the rubber rings on the zoom and focus rings a bit more *loose than my DA kit lens). Thanks for the clear-up there, yes it is the powerzoom version.

does look like a good alternative. quite heavy though (even heavier than the DA 55-300!) Will do real-world tests in a while. Thanks everyone!

Last edited by Alizarine; 01-01-2012 at 06:25 PM. Reason: *spelling check lol
12-30-2011, 05:05 AM   #10
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Yes, the Powerzooms are pretty well built, but the zoom bottom itself sometimes fall apart. Good luck with it. This lens is on my own shopping list, some time...
12-31-2011, 06:31 AM   #11
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I have both the 28-80 and 28-105 power zooms, both have had the zoom mode button fail, the 28-80 I bought used with the button missing all together but otherwise the lens is fine, for $10 it was a good find, the 28-105 I took with my PZ1 when I got it in 1992. Optically the lens is good, but relatively slow. I am not sure you could easily tell the difference though
12-31-2011, 10:15 AM   #12
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I really have to need that specific range to use mine. It's heavy and slow, so I'll choose something else for walking around or travel. If someone offered me the FA 28-70/4 for a good price, that lens is a better fit for me, and half the weight of the 28-105 PZ.
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