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10-13-2013, 03:28 AM   #1
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Pentax 50-135mm f/2.8 or Tamron 70-200mm f/2.8

Hi need help from you guys. I am just confused between pentax 50-135mm and tamron 70-200mm. which one should I go for? Pentax is lighweight and has sdm whereas tamron is a bit cheap and has better range.

10-13-2013, 05:49 AM   #2
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What do you plan to shoot with it? I've had both and they are both great lenses. I preferred the Tamron for sports and the Pentax for indoor concerts and such. I ended up getting a Sigma 70-200 hsm. It is also a heavy lens, though.

10-13-2013, 05:54 AM   #3
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I have both too.

The Tamron is actually a FF lens, so on APS-C, it's a 105-300
Angle of View 34-12 (in 35mm format)

The Pentax is what a *traditional* 70-200 is given it's 50-135.
Diag - 31.5-11.9 degrees (APS-C)

They do not cover the same angles of views on an APS-C camera.
So they are completely different.

10-13-2013, 06:03 AM   #4
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What are you looking for in the lens? Humorously the Tamron's AF is a bit slow (even if it is screwdrive), so the slow SDM on the 50-135 isn't going to look bad in comparison. When looking at shots from both lenses (I have the 70-200), they are both sharp, with the edge going to the 50-135. On the other hand, I love the extra range the 70-200 gives me. On the other other hand, the WR and the light weight of the 50-135 is amazing.

10-13-2013, 06:15 AM   #5
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You have answered your own question in terms of pros and cons in your questions. Those are it.

I have used both but kept the pentax because the versatility of the smaller size was too convenient for me. In the right light, if you can do without the hood, its about the largest size you can point at someone without intimidating them. Relatively speaking of course. With a newer camera you can crop to get closer but dont forget that the wider end of the pentax is quite useful if you do some indoor shooting. 50 vs 70 can be a bid deal then, so the range cuts both ways...

To me you are likely to use the pentax a lot more and in more situations unless you are looking for the long end specifically:

For the stage/events/sports and even street photos its pretty versatile:










Last edited by psychdoc; 11-14-2015 at 03:41 PM.
10-13-2013, 06:42 AM   #6
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I have been looking into these two lenses also. In the near future is like to purchase one. My third contender is the discontinued sigma 50-150. Not a fan of the tamron's size tho. But I am weary of the SDM problems as I could not justify a new pentax one.
10-13-2013, 06:55 AM   #7
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Two very different lenses. I don't have any experience with the Tamron 70-200 F2.8, but I have the Sigma 70-200 F2.8 (which should have similar properties) and the Pentax 50-135.
I find the image quality of the Pentax is certainly better and the lens is much smaller and lighter, but the AF is slow and not so great for action shots.
The Sigma is much bigger and heavier and has much faster AF, and especially with the extra reach is much better suited to sports, but with the size and weight is not great for carrying around all day.
There's quite a difference in the horizontal angle of view at the short end as well - 27 degrees -v- 19 degrees.
10-13-2013, 07:00 AM   #8
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Actually I have recently switched from Nikon.
At present I have K-01 and K-5iis.
Lenses I have got are Pentax 16-45 f/4
Pentax 55 f/1.4
And Pentax da 55-300
Iam a hobbyist and use it mostly for portraits and and some landscapes.
I wanted to have a fast lens to replace 55-300.
I had 60-250 f4 on my mind too. If I chose 50-135 then I will keep 55-300
On the other hand if I get 60-250 or 70-200 I would sell 55-300
Weight is a concern. As I haven't used any lens as heavy as 1100g.

10-13-2013, 08:06 AM   #9
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QuoteOriginally posted by Wakaas Quote
Actually I have recently switched from Nikon.
At present I have K-01 and K-5iis.
Lenses I have got are Pentax 16-45 f/4
Pentax 55 f/1.4
And Pentax da 55-300
Iam a hobbyist and use it mostly for portraits and and some landscapes.
I wanted to have a fast lens to replace 55-300.
I had 60-250 f4 on my mind too. If I chose 50-135 then I will keep 55-300
On the other hand if I get 60-250 or 70-200 I would sell 55-300
Weight is a concern. As I haven't used any lens as heavy as 1100g.
If weight is a concern the DA* 50-135 is your friend. I own the DA* 60-250 and have gone to a holster style belt and shoulder straps to carry it. It would be the same with the 70-200s, whether Tamron or SIgma. The simple fact is, long and fast is not light. And as someone told me before I bought my 60-260, those heavy lenses will suck the life out of you. I had to buy one to realize how true that is. I still love the lens, but I suffer for that lens.
10-13-2013, 08:25 AM   #10
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I think I should go for 50-135mm and keep my 55-300. In near future will plan for 300mm f/4 if needed.
One more thing. What abt 50-135mm sdm motor. I have read it stops working at some time.
Besides thanks for feedback.
10-13-2013, 10:45 AM   #11
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QuoteOriginally posted by jaywes Quote
I have been looking into these two lenses also. In the near future is like to purchase one. My third contender is the discontinued sigma 50-150. Not a fan of the tamron's size tho. But I am weary of the SDM problems as I could not justify a new pentax one.
I recently sold a Sigma 50-150 that I bought specifically to replace my 50-135. What went wrong with my plan? While the 50-150 is a very good lens, it just can't match the IQ of the 50-135. It's goodness is more of the journalistic type, and indeed, it would be perfect in that realm. It does focus a bit faster. and of course there is no SDM concern, but in the end I decided that if I don't love the images that the faster focusing allows me to get, then what's the point? The whole experience made me finally realize what a special zoom the 50-135 is. Fast action is the only thing in it's range that it does not excel at. I've had mine for years with never any hint of a problem, but if the SDM does go out someday, I'll just get it fixed. The lens is worth it. Plus, supposedly when they do the repair these days they make it better, faster, and with a "normal" level of reliability. Part of me almost wishes it would go down on me.
10-13-2013, 11:43 AM   #12
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Thanks for the insite. I was planning to but the 50-135 used not new. Hopefully I won't run into any SDM issues as you haven't. The size of the 70-200s are just a major dislike for me and my intended use.
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