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11-09-2010, 02:01 AM   #46
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Got some news about the new sigma lenses.
Talked with Sigma at the 'Salon de la Photo' in Paris.

The new lenses will come out in january/february, and of course the possibility
to buy them in K-mount!

But I should have asked more about the quickshift possibility


Price for the new 150mm macro: about 1000 euros

11-09-2010, 02:27 AM   #47
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That's great news!
Expensive, but it has no competition, at least when it comes to K-mount... OK, you can try to hunt for one of the old 200/4's, but they will likely be much more expensive and it may take a couple of years to get one.

All Sigma HSM lenses have quickshift / manual focus override / whatever we call it, afaik.
11-09-2010, 06:47 AM   #48
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QuoteOriginally posted by ezechiel Quote
Got some news [...] the possibility
to buy them in K-mount!
Pardon my ignorance ...
But if I just go the the Sigma website (I used the German one) 150mm F2.8 EX DG MAKRO OS HSM: SIGMA Deutschland GmbH
then it lists "PA" as supported mount (which means Pentax K mount).
It even says "Hybrid-OS im Sony und Pentaxanschluss: ja"

So, what is the news?
Or is this recent?
11-09-2010, 08:20 AM   #49
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That must be recent.
The US site to contrast is listing availability in only the Sigma mount for the moment, but we know it'll definitely come in Canikon mounts too.

11-09-2010, 09:00 AM   #50
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QuoteOriginally posted by falconeye Quote
Pardon my ignorance ...
But if I just go the the Sigma website (I used the German one) 150mm F2.8 EX DG MAKRO OS HSM: SIGMA Deutschland GmbH
then it lists "PA" as supported mount (which means Pentax K mount).
It even says "Hybrid-OS im Sony und Pentaxanschluss: ja"

So, what is the news?
Or is this recent?
It has to be recent because the Sigma 150mm has never ever been offered in k-mount. At one point, they had the 50, 70, 105, and 180mm macro lenses in k-mount but dropped the 180 over a year ago. So if the 150mm/2.8 macro is being offered in K-mount, it is BIG news for macro guys/gals.
11-09-2010, 09:13 AM   #51
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QuoteOriginally posted by Blue Quote
So if the 150mm/2.8 macro is being offered in K-mount, it is BIG news for macro guys/gals.
Oh, that's great.
I just checked alternatives for the DFA100/2.8 (which seems to be great in itself) and ran across the Sigma 150/2.8 Macro which, as it turned out, was available for Pentax too. So I liked it but now I learn how good a news it actually is

The German Sigma site has MTFs for both versions online (old and new OS). The new one actually has the better MTFs and beats the Sigma 70/2.8 Macro too. That's outstanding indeed.
11-09-2010, 11:06 AM   #52
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QuoteOriginally posted by falconeye Quote
Oh, that's great.
I just checked alternatives for the DFA100/2.8 (which seems to be great in itself) and ran across the Sigma 150/2.8 Macro which, as it turned out, was available for Pentax too. So I liked it but now I learn how good a news it actually is

The German Sigma site has MTFs for both versions online (old and new OS). The new one actually has the better MTFs and beats the Sigma 70/2.8 Macro too. That's outstanding indeed.
I believe the non-OS 150 version was also better than the 70. anyway, this is great news. but will this 150mm be better on the Sigma SD1? :ugh:
11-09-2010, 12:17 PM   #53
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QuoteOriginally posted by Pentaxor Quote
I believe the non-OS 150 version was also better than the 70. anyway, this is great news. but will this 150mm be better on the Sigma SD1? :ugh:
Why wouldn't the Sigma mount version be at least as good on the SD1?

11-09-2010, 02:34 PM   #54
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QuoteOriginally posted by falconeye Quote
The new one actually has the better MTFs and beats the Sigma 70/2.8 Macro too.
How's that even possible?
The Sigma 70/2.8 is already one of the sharpest macro lenses around. From my experience it seems hard to improve on it; maybe with a higher resolution sensor than I've got, a difference would be noticable.

Well, the 150mm uses 19 (rather than 10) lens elements. Quite an elaborate design.
11-09-2010, 03:07 PM   #55
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QuoteOriginally posted by Blue Quote
Why wouldn't the Sigma mount version be at least as good on the SD1?
I was suggesting that the 150mm might be better on the SD1 compared to what Pentax now has to offer, camera-wise. this does not concern mounting, AF-speed, nor OS operation, but in terms of IQ.
11-09-2010, 03:20 PM   #56
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QuoteOriginally posted by Blue Quote
It has to be recent because the Sigma 150mm has never ever been offered in k-mount. At one point, they had the 50, 70, 105, and 180mm macro lenses in k-mount but dropped the 180 over a year ago. So if the 150mm/2.8 macro is being offered in K-mount, it is BIG news for macro guys/gals.
Yep, I wish. Not even 180 is listed anymore in the K mount roundups here eg.
Sigma Imaging (UK) Ltd

And .JP (home of the company so they should know) only has barcodes for Sigma, Canon, Nikon, Four Thirds:
Super compact and lightweight, large aperture telephoto lens with life-size macro capability. APO MACRO 150mm F2.8 EX DG HSM - SIGMA CORPORATION

But it's not only about listing anyway, even if you find, say a P.K.180 up on a vendor website you cop the 'not available or not in stock' cold-shoulder when you beg to buy it.

I desperately want a 150 (or 180 at a pinch) and only solution seems will have to change body brands.

.R.
11-09-2010, 03:24 PM   #57
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QuoteOriginally posted by Class A Quote
How's that even possible?
The Sigma 70/2.8 is already one of the sharpest macro lenses around. From my experience it seems hard to improve on it; maybe with a higher resolution sensor than I've got, a difference would be noticable.

Well, the 150mm uses 19 (rather than 10) lens elements. Quite an elaborate design.
higher resolution camera or further cropping (upscaling).

having said that, the advantage will most likely fall on the focal range and retaining the same amount of sharpness and detail or much better at such corresponding range. there is an added benefit of shooting at a much longer distance which is convenience of use.

as far as IQ difference between 70 and 150, imagine shooting with a 70mm at 5ft versus the 150 at 10ft. the 150 can give you much headroom. and I would think that 150 at 5ft could even have better results.

on a sidenote, this is also the reason why I'm considering the Sigma SD1. which might be able to take full advantage of the lens' resolving power. lens' focal range resolution + camera's resolution cropping capacity.
11-09-2010, 05:17 PM   #58
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I desperately want a 150 (or 180 at a pinch) and only solution seems will have to change body brands.

I have seen a Tamron 70-200 macro on eBay with a Pentax mount. There is probably one still on eBay.
11-09-2010, 05:26 PM   #59
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QuoteOriginally posted by traderdrew Quote
I desperately want a 150 (or 180 at a pinch) and only solution seems will have to change body brands.

I have seen a Tamron 70-200 macro on eBay with a Pentax mount. There is probably one still on eBay.
I really wouldn't consider the two (1:1 macro primes vs. a 1:3 macro zoom) the same thing... 1:3 is not even close to 1:1 macro.
11-09-2010, 05:37 PM   #60
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QuoteOriginally posted by Hypocorism Quote
I desperately want a 150 (or 180 at a pinch) and only solution seems will have to change body brands.
I don't get it.
Sigma 150/2.8 Macro for K-mount is available for Pentax K-mount as by my link, officially listed on the Sigma website. With USM and OS support for Pentax.

Look up my previous posts earlier today.



As for Foveon X3.

I think this is a never ending debate. How do resolutions compare.

I found this old source looking at the MTFs at least:

http://www.foveon.com/files/FrequencyResponse.pdf

It says that for Black&White contrast, the X3 has MTF 50 at Nyquist where Bayer is down to 60% Nyquist at MTF50.

It even says that MTF50 figures for a red/blue edge are 35% and 15% of Nyquist resp.

However, knowing true MTF curves from measurements including a good lens, I know that state-of-the-art demosaicing and sharpening to compensate for the AA filter (both not needed for X3) deliver much better curves.

As a compromise, let me take the intermediate values between the two extremes. I.e., Bayer resolving like X3 at a spatial frequency of 80% for Black&White and 70% for red blue, compared to X3.

This means that a camera would have to have the following pixel resolution to compare:

Foveon X3: 15 MP (b&w and color detail)
Bayer: 23 MP (b&w detail)
Bayer: 30 MP (color detail)

So, in terms of resolution, I would expect the SD1 to perform like a Sony A900 and beat it for color detail.
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