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07-23-2016, 08:40 AM   #1
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Pentax 16-85 vs tamron 28-75/2.8

Would you trade a tamron 28-75/2.8 in for a Pentax 16-85?

07-23-2016, 09:13 AM   #2
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nope. weather resistance seems interesting but I prefer the constant f2.8.
07-23-2016, 09:26 AM   #3
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Note , part of the consideration is weather resistance, the other part is filling the gap between 28mm and my sigma 10-20. The last part of the equation is the Tammy does not really play well with my K7. Using a flash it is razor sharp, but without flash I think the SR does not get the correct focal length fed to it, as the shots are always a little off. It has worked well on my K10 and K5, just not the K7 for some reason.

But really the range and WR are what I am looking at. Given the ISO performance of the K5 going to F4 at the long end is not really a show stopper.
07-23-2016, 09:32 AM   #4
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QuoteOriginally posted by Lowell Goudge Quote
Given the ISO performance of the K5 going to F4 at the long end is not really a show stopper.
The 16-85 is f/5.6 wide open at the long end... that may still be ok for you, but it's an awful lot less light than f/2.8...

07-23-2016, 09:32 AM   #5
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Yes, the Tamron is not wide enough for me. And at F2,8 it is pretty soft.

Last edited by DutchGonzo; 07-23-2016 at 09:37 AM. Reason: Little mistake...
07-23-2016, 10:42 AM   #6
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QuoteOriginally posted by Lowell Goudge Quote
Note , part of the consideration is weather resistance, the other part is filling the gap between 28mm and my sigma 10-20. The last part of the equation is the Tammy does not really play well with my K7. Using a flash it is razor sharp, but without flash I think the SR does not get the correct focal length fed to it, as the shots are always a little off. It has worked well on my K10 and K5, just not the K7 for some reason.

But really the range and WR are what I am looking at. Given the ISO performance of the K5 going to F4 at the long end is not really a show stopper.
nope, I got my Tamron for indoor shot's where I need a large aperture. And I wonder what it is with your K-7 and the Tammy. I use it often on my K-7 without problem.
07-23-2016, 12:06 PM   #7
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QuoteOriginally posted by DutchGonzo Quote
Yes, the Tamron is not wide enough for me. And at F2,8 it is pretty soft.
Doesn't that answer your question?

07-23-2016, 02:10 PM   #8
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The wider 16 end is very useful. I have the 16-85.
07-25-2016, 05:53 AM   #9
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QuoteOriginally posted by BigMackCam Quote
The 16-85 is f/5.6 wide open at the long end... that may still be ok for you, but it's an awful lot less light than f/2.8...
I wuold if I didn't already have a 16-85...

for me, extra large apertures are for primes. Convenience is for zooms. And the 16-85 is perfectly good wide open, while fast lenses are often so-so until you close down about a stop, making them not almost as "slow" as the 16-85.

Especially now that I have the high ISO performances of the K-1, super speed is not a requirement.
07-25-2016, 06:28 AM   #10
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QuoteOriginally posted by bdery Quote
I wuold if I didn't already have a 16-85...

for me, extra large apertures are for primes. Convenience is for zooms. And the 16-85 is perfectly good wide open, while fast lenses are often so-so until you close down about a stop, making them not almost as "slow" as the 16-85.

Especially now that I have the high ISO performances of the K-1, super speed is not a requirement.
Confirm that.
Before I purchased the K-1 I ordered the 16-85 and the 28-105 and compared them vs. the Tammy 28-75. Guess what... the Tammy was the sharpest under all conditions except 2.8 (which some consider THE unique sales point) , 16-85 was slightly behind and the 28-105 could not hold up.
Comparison done on K3II.
The old Pentax 24-90 I got 2nd hand these days... it renders nicely on the K - 1 but sharpness does not reach the level of the 28-75. If stopped down it comes close to the other 2 new lenses, anyway it's a lens of the film era and still good for not too detailed landscape, every-day-use, light travel and portrait (!)
This, of course, can only be a subjective impression of mine, no scientific approach... 😉
And lenses, as we learned earlier, can vary a lot due certain manufacturing process reasons...

Last edited by PentxOrni; 07-25-2016 at 06:38 AM.
07-25-2016, 07:21 AM   #11
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given all the comments, and considering my tammy is 10 years old, maybe the value is such that at this point, i simply get the 16-85 based upon being WR , plus the zoom range improvement, and convenience, and then think about what to do with the tammy ( or perhaps it goes on the shelf with the rest of my collection) to be used only occasionally or perhaps with my PZ1
07-25-2016, 09:43 AM   #12
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I will keep the tamron (a very good zoom) and use the saved $$ to buy a 16-45 to cover the wide end.
07-25-2016, 09:51 AM   #13
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That Tamron is great on FF and seems pretty sharp to me.
07-25-2016, 10:20 AM   #14
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For me, I would not hesitate to trade the tamron for the Pentax if I had an APS-C camera. The 16mm wide end is enough of a difference to me. The weather sealing would seal the deal (lame pun).
07-25-2016, 11:39 AM   #15
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QuoteOriginally posted by grahame Quote
I will keep the tamron (a very good zoom) and use the saved $$ to buy a 16-45 to cover the wide end.
i have already indicated that i have a 10-20, so for me, really it is two things, one is weather sealing and the second is covering thegap between the 28-75 and the 10-20. adding a third lens to do this, is not as practical as having the second lens cover the gap,

---------- Post added 07-25-2016 at 02:42 PM ----------

QuoteOriginally posted by cali92rs Quote
For me, I would not hesitate to trade the tamron for the Pentax if I had an APS-C camera. The 16mm wide end is enough of a difference to me. The weather sealing would seal the deal (lame pun).
as i have already discussed that i am using currrently a k5 and k7 and that i have a sigma 10-20 also makes it pretty clear that i am shooting a cropped sensor. that may change, but for now, i dont plan to do so
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