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02-04-2011, 02:59 AM   #1
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Follow-up to my thread below: sigma 18-50 non-macro vs tamron 17-50?

I have been receiving some really valuable advice, and it has helped me to figure out where I want to go with shaping my lens kit, which is different direction than the title of the thread....hence the new post. What I really want is to match the DA* 16-50 with the DA* 60-250. Now as has been beat to death, the DA* 16-50 doesn't have the best reputation for SDM issues. I have read of a few limited failures with the 60-250 but it seems that this lens is far lens prone to SDM failure (correct me if I am wrong) and anyways, I have purchased one from a fellow forum member. One SDM lens without a nasty reputation is probably all I am comfortable with right now. I will keep the faith that Pentax will figure out their high end lenses, but for the time being I want to pair a sigma (actually 2 sigmas) with the DA* 60-250.

I think I have made up my mind after seeing the reviews of the sigma 8-16 that I need to get this lens! It looks stellar. I will then just have the obvious hole between that lens and the DA* 60-250 to fill. I need to fill it with a constant 2.8 as this will be my lens for low light conditions. I will get the DA* 16-50 as soon as Pentax formally addresses the issues with this lens (and the 50-135 which seems just as prone) but for now I want reliability. So in looking on the sigma website it appears there are 3 options. There is the 17-50 OS HSM, the 18-50 macro, and the 18-50 macro HSM. (I know the last 2 are discontinued but I'm assuming are available second hand)

So how do those 3 sigma zooms compare? I love the idea of a macro lens in the 18-50s, but is the OS shake reduction of the 17-50 a big draw? Do these sigmas not take advantage of the built-in image stabilization in the K-7?

Any advice on figuring out which of these 3 lenses would be best for me to fill the whole until I can sell it and get a DA* 16-50 would be appreciated! Thank you -LE


Last edited by Loren E; 02-04-2011 at 11:05 PM.
02-04-2011, 03:45 AM   #2
gtl
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Try the Tamron 17-50. Cheaper than the sigma 17-50 and optically very very good. No HSM though. Sigma OS would interfere with Pentax SR. You can only enable one at a time. The only benefit to the Sigma OS is that it would stabilise the viewfinder when you shoot.

QuoteOriginally posted by Loren E Quote
I have been receiving some really valuable advice, and it has helped me to figure out where I want to go with shaping my lens kit, which is different direction than the title of the thread....hence the new post. What I really want is to match the DA* 16-50 with the DA* 60-250. Now as has been beat to death, the DA* 16-50 doesn't have the best reputation for SDM issues. I have read of a few limited failures with the 60-250 but it seems that this lens is far lens prone to SDM failure (correct me if I am wrong) and anyways, I have purchased one from a fellow forum member. One SDM lens without a nasty reputation is probably all I am comfortable with right now. I will keep the faith that Pentax will figure out their high end lenses, but for the time being I want to pair a sigma (actually 2 sigmas) with the DA* 60-250.

I think I have made up my mind after seeing the reviews of the sigma 8-16 that I need to get this lens! It looks stellar. I will then just have the obvious hole between that lens and the DA* 60-250 to fill. I need to fill it with a constant 2.8 as this will be my lens for low light conditions. I will get the DA* 16-50 as soon as Pentax formally addresses the issues with this lens (and the 50-135 which seems just as prone) but for now I want reliability. So in looking on the sigma website it appears there are 3 options. There is the 17-50 OS HSM, the 18-50 macro, and the 18-50 macro HSM. (I know the last 2 are discontinued but I'm assuming are available second hand)

So how do those 3 sigma zooms compare? I love the idea of a macro lens in the 18-50s, but is the OS shake reduction of the 17-50 a big draw? Do these sigmas not take advantage of the built-in image stabilization in the K-7?

Any advice on figuring out which of these 3 lenses would be best for me to fill the whole until I can sell it and get a DA* 16-50 would be appreciated! Thank you -LE
02-04-2011, 03:57 AM   #3
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Good tip, didn't know about that lens. I like the price as well as the 67mm filter because I could use my DA* 60-250 filters for it. What about the macro ability of the sigma 18-50 though? I have heard they are very liberal in labeling lenses as macros....would I really be losing a fun aspect by going to the tamron?
02-04-2011, 04:48 AM   #4
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If you're after something to fill that gap I'd look to the Tamrom... and get a 90mm macro prime for close up work...

Thats just me...

02-04-2011, 05:10 AM   #5
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I had a slightly similar issue.

I had the 50-135 which is a fine lens. But the only other zoom I had was a sigma 18-200 which was awful in low light.

So for a shorter zoom I had to decide between 17-50 s/tam vs p 16-50 vs tam 28-75. At the end of the day it was between the new sigma 17-50 hsm vs the old tamron 28-75.

The sigma 17-50 has some great reviews but less real world experience as it is new. I think I read somewhere that its center sharpness was 'sensational' However, I think the 18-50 macro has some great real world reviews.

The tamron has been around a long time. However it is in inexpensive. In the end I decided that to get the tamron 28-75 as I am a people photographer first. If landscapes were my thing I would have chosen a 17-50. Down the line I will get a wide angle of some sort. But for now the 18-200 at its wide end will do for my level of skill. The big drawback to the tamron is that it looks pretty ugly!! Compared to the 16-50 which looks stunning. Well, its the pics that matter. I only got the tamron yesterday so its still too new for real comments on it...
02-04-2011, 06:59 AM   #6
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Something to keep in mind is that there is no Sigma 18-50/2.8 Macro HSM for K-mount; that only exists for Nikon Mount. As far as I know, in order of release, there is the 18-50/2.8 non-macro, the 18-50/2.8 Macro and the 17-50/2.8 HSM. I was in a similar situation as the OP, and for me it was a choice between the DA* 16-50/2.8, the Tamon 17-50/2.8 and the Sigma 17-50/2.8. I ruled out the DA* due to the SDM issues (or non-issues according to the official Pentax line), and decided to go the Sigma over the Tamron because of HSM; for me having HSM was worth the extra cost over the Tamron.
02-04-2011, 03:59 PM   #7
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Ok so I want to minimize spending if I don't get the DA* 16-50, so I am going to rule out the sigma 17-50 because it is not a cheap lens. As was pointed out, the sigma 18-50 macro HSM wasn't offered in K mount so that leaves me with either the tamron 17-50, or the sigma 18-50 macro (not HSM). The sigma looks to go for cheaper on ebay, $250 vs $300.....anyone have experience with this lens? Would be fun to have the macro capability, and does it perform well other than that?
02-04-2011, 04:06 PM   #8
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I've got the 18-50 macro coming to me later today or tomorrow... so I'll put it through its paces and get back to you.

02-04-2011, 04:24 PM   #9
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Thanks Wshi. I just saw the cheapest option would be the 18-50 sigma without macro though, because it is a cheaper lens and it has the same filter size as the DA* 60-250 (macro has 72mm not 67mm) so I might go for that lens after all, they go CHEAP on ebay!
02-04-2011, 09:36 PM   #10
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I have the Sigma 18-50 macro and have been generally pleased with it. It's not a full macro, 1:3 I believe, so if you want to do some serious macro, you probably want something more. Most of the reviews I've seen for the sigma 18-50 non macro haven't been too impressive, so you might want to make sure you have a right to try it and return if you don't like it.
02-04-2011, 10:00 PM   #11
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I'm down to either the 18-50 sigma non macro or the 17-50 tamron ....... the tamron doesn't cost too much more I don't think.....any comparisons for those who have used both?
02-05-2011, 12:51 AM   #12
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Loren:

I have shot with the Tamron 17-50 2.8 for 3 years, taking over 15,000 shots with it. It will close focus down to about 10 inches, and does some excellent work there. I have not shot with either of the Sigma zooms, but have seen many fine images from them. If you look in our Tammy Club here: https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/31955-tammy-club-29.html you will see many, many shots done with the Tamron. There is also a Sigma club too.
02-05-2011, 02:04 AM   #13
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How do they compare in build quality? Of course neither is weather resistant but if you were to trek around to remote places and see some harsh conditions is does one stand out over another as more likely to get drizzled on a little and make it, or take a few bumps and be no worse for the wear?

I am researching but having trouble finding out: are they both screw-drive AF? And do both have quick-shift from auto to manual focus?

This is going to be my low-light lens, so I want both acceptable performance wide-open at 2.8 as well as acceptable auto-focus accuracy in lower light.....I am reading the sigma doesn't do great at F2.8 but not hearing much more then that.....

Also the sigma has a similar minimum focusing distance, 11 inches, so I am guessing that macro-wise they would do a similar job?

I am starting to lean towards the tammy here......push me one way or the other more experienced photogs!
02-05-2011, 02:50 AM   #14
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HSM is not screw drive as far as I know.

Have you considered a prime like DA35/2.4 ? If you can zoom with your feet, it might be a good option as a gap filler. Will not work that nice when you're floating around on the sea while fishing
02-05-2011, 03:03 AM   #15
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The sigma 18-50 f2.8 non-macro does not have HSM, it is only labeled as EX DC.

I have not considered a prime as I will need the flexibility of a zoom in the 16/17/18-50mm range. I want the DA* 16-50 but am not going to buy it because of my concern for SDM. So in the meantime I want a decent zoom of similar range w/ F2.8 that won't cost much to get me by until Pentax fixes the mess they have made out of their pro level lens lineup.
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