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09-23-2008, 06:42 AM   #1
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Sigma 24-70 w/ new optical formula?

Maybe it'll be as sharp as the Tamron now?
Sigma 24-70mm F2.8 EX DG HSM: Digital Photography Review

and I won't have to keep playing Tamron roulette and see if I can go 0 for 4

09-23-2008, 11:38 AM   #2
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QuoteOriginally posted by kenyee Quote
Maybe it'll be as sharp as the Tamron now?
Sigma 24-70mm F2.8 EX DG HSM: Digital Photography Review

and I won't have to keep playing Tamron roulette and see if I can go 0 for 4

Looks very good, the addition of HSM is a great feature. I will surely take a look and possible update my present glass in that range.
09-23-2008, 12:52 PM   #3
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Just had a look at this model, and it is indeed interesting. My 24-70 is nice and sharp, and this will only be more so.

I have noticed that they have got rid of the Macro ability (which is useful) and the aperture ring, but have given it the HSM.

Hmmm do I get rid of mine, and buy this, or just buy this as well.

I see some more LBA coming up......
09-23-2008, 12:56 PM   #4
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QuoteOriginally posted by offertonhatter Quote
I have noticed that they have got rid of the Macro ability (which is useful) and the aperture ring, but have given it the HSM.
that will probably improve the lens, basing on the IQ loss from adding the macro to the 70-200

09-23-2008, 01:19 PM   #5
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QuoteOriginally posted by k100d Quote
that will probably improve the lens, basing on the IQ loss from adding the macro to the 70-200
We can only hope this is true...no idea why they'd bother adding a pseudo macro to a 70-200/2.8 :-P
Any idea how quickly Sigma gear is purchasable after they make an announcement? I'm wondering when we'll actually see reports on how sharp this is...
09-23-2008, 01:42 PM   #6
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QuoteOriginally posted by kenyee Quote
We can only hope this is true...no idea why they'd bother adding a pseudo macro to a 70-200/2.8 :-P
Any idea how quickly Sigma gear is purchasable after they make an announcement? I'm wondering when we'll actually see reports on how sharp this is...
If you look at some of the images taken by 70-200 on this forum, you will see that IQ is very good. I don't know why they marked it as macro as it is certainly not a true macro by any sense. It seems to me that if a lens can focus below 1:4.0 it could be considered a macro and advertised as such. Look, the new 24-70 can focus to 15in while the old macro is 15.7in but the ratio of the new one is 1:5.3 versus 1:3.8.
09-23-2008, 01:48 PM   #7
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Price is one of the first things I look at on a lens spec sheet. Price is very important to me as a buyer. I'd like to see a price tag on one of these.
09-23-2008, 01:56 PM   #8
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QuoteOriginally posted by Denis Quote
If you look at some of the images taken by 70-200 on this forum, you will see that IQ is very good.
But if you look at images from the non-macro version, the older 70-200 was sharper. That's what we're talking about.

Aegon: price will probably be the same as the current Sigma 24-70 so you can use that to judge how much it'll be...it's roughly $400-500.

09-23-2008, 02:08 PM   #9
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does hsm work with pentax now then? it never used to
09-23-2008, 02:17 PM   #10
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it's not that HSM didn't work. it's that Sigma's Pentax offerings didn't have it.
09-23-2008, 05:37 PM   #11
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QuoteOriginally posted by kenyee Quote
But if you look at images from the non-macro version, the older 70-200 was sharper. That's what we're talking about.

Aegon: price will probably be the same as the current Sigma 24-70 so you can use that to judge how much it'll be...it's roughly $400-500.
I own the new 70-200 HSM and when I compare images with the old one, I can not see much of a difference. I don't know what you are basing your comments on. I don't always believe what reviews have to say. I base my decision on actual use by more than one tester. Look at the photos "Jimbo" (also an owner) has posted and compare. I think dpreview was very general with test not done on a Pentax body. How much of an effort was made to ensure perfect focus?

Here is 100% crop of an image I have posted.

https://www.pentaxforums.com/forums/post-your-photos/37677-city-champions.html


09-23-2008, 05:40 PM   #12
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QuoteOriginally posted by Denis Quote
I own the new 70-200 HSM and when I compare images with the old one, I can not see much of a difference. I don't know what you are basing your comments on. I don't always believe what reviews have to say.
It was based on the comments of people who have owned both.
You're saying you have Sigma 70-200 DG and also the DG Macro?
And you've done identical tests of both on the same subjects?
09-23-2008, 05:42 PM   #13
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to answer the original question, yes different formula
old one is 13 elements in 14 groups (does this even make sense?), new one is 14 elements in 12 groups

Sigma - Lenses
09-23-2008, 05:57 PM   #14
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QuoteOriginally posted by kenyee Quote
It was based on the comments of people who have owned both.
You're saying you have Sigma 70-200 DG and also the DG Macro?
And you've done identical tests of both on the same subjects?
The new is APO 70-200mm F2.8 II EX DG MACRO HSM.
It has only been available for the past 2 weeks.
Take notice that the lens is version II.

Not the same as the one tested in dpreview, a version II. This lens has improved optical performance according to Sigma. You might be right between the old DG and old DG Macro but this is not the same as the one above.

Sigma - Lenses

Last edited by Denis; 09-23-2008 at 06:21 PM. Reason: correction on version in dpreview
09-23-2008, 06:15 PM   #15
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In addition to above, if you read the Sigma data for version II EX DG MACRO, it indicates that "Two SLD and three ELD glass elements provide excellent correction for all types of aberrations" while "This lens uses two ELD (Extraordinary Low Dispersion) glasses and two SLD (Special Low Dispersion) glasses for utmost correction against chromatic aberrations" for the EX DG MACRO HSM.

You can see that the new version II has 3 ELD glasses versus 2 for the DG MACRO HSM.

I think Sigma was made aware and made some changes to improve the IQ. Based on my version II, it worked.

Last edited by Denis; 09-23-2008 at 06:19 PM. Reason: I was wrong on dpreview.
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