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04-11-2014, 09:30 AM   #181
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QuoteOriginally posted by ElJamoquio Quote
Awesome. I think I'd rather have this lens than, say, the Sony 50mm F/1.8 which is about the same price...
What ? I knew Sony was out of their mind but still ...

04-12-2014, 07:20 AM   #182
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QuoteOriginally posted by thibs Quote
What ? I knew Sony was out of their mind but still ...
Actually it's a 55mm f1.8 lens, which Sony (like Zeiss and Sigma) has made as a premium lens to offer exceptional resolution (and it has tested very well thus far). I don't think the price/features are crazy for it at all as compared to the others (though ElJamoquio may perhaps be right that the Sigma is still to be slightly prefered).

Sony Global - Digital Imaging - ? Lenses - Sonnar T* FE 55mm F1.8 ZA
04-12-2014, 07:48 AM   #183
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Now if Pentax would redesign the DA* 55mm F/1.4 with a faster AF motor and improve its optical performance.

Or maybe Pentax needs to produce a D-FA* 50mm F/1.2 for the upcoming full frame.
04-12-2014, 08:48 AM   #184
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QuoteOriginally posted by macTak Quote
Actually it's a 55mm f1.8 lens, which Sony (like Zeiss and Sigma) has made as a premium lens to offer exceptional resolution (and it has tested very well thus far). I don't think the price/features are crazy for it at all as compared to the others (though ElJamoquio may perhaps be right that the Sigma is still to be slightly prefered).

Sony Global - Digital Imaging - ? Lenses - Sonnar T* FE 55mm F1.8 ZA
Oww, I understood (wrong obviously) it was a banal 50/1.8.
Sony's know for their stupid price (see Sony's 35/1.4) so it looked absolutely possible to me

04-17-2014, 09:38 AM   #185
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DPR has now posted its test of the Sigma. The result have it almost on par with the Zeiss Otus (slightly worse at maximum aperture, but stopped down in becomes as good in the centre and a little better in the corners than the Zeiss at some apertures). Out of fun, I compared it (on Canon 7D) to the only Pentax prime they have with the tool, the 40 Ltd (on K-5)--at maximum aperture (f1.4) it has the same MTF50 as the DA40 at its best aperture, f8 (and less CA)! Though of course the 7D is 18MP, so the Sigma is not quite there, but nevertheless that is a resounding performance for the Sigma. The testing values are on DXO too, which has more options in regard to comparison to Pentax lenses: e.g., the Sigma, on the 20MP 70D gets 15MP of resolution (I hate how DXO does these, by the way, so take it with the usual grain of salt), the DA*55 on the 24MP K-3 gets 11MP of resolution (and the DA50/1.8 12MP).

Last edited by macTak; 04-17-2014 at 09:53 AM.
04-17-2014, 02:19 PM   #186
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Which is why you can't compare to other systems, so jour post is irrelevent.
04-17-2014, 02:46 PM   #187
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Regardless, it's sharper than the previous Sigma 50 F1.4 by a decent margin it seems, and that lens was no slouch. One of the selling points of the Zeiss was the lack of chromatic aberrations when shooting night shots with light sources in and out of focus. I wonder how the Sigma does with regards to that.
04-17-2014, 02:46 PM   #188
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QuoteOriginally posted by macTak Quote
The testing values are on DXO too, which has more options in regard to comparison to Pentax lenses: e.g., the Sigma, on the 20MP 70D gets 15MP of resolution (I hate how DXO does these, by the way, so take it with the usual grain of salt), the DA*55 on the 24MP K-3 gets 11MP of resolution (and the DA50/1.8 12MP).
DXO lens evaluation/ranking methodology is very poorly thought out by attempting to aggregate all information into some meaningless singular numbers. The most shocking thing to me is this is even their written goal. Very little relevant information can be extracted from them. For instance a lens with a crazy sharp center, but borders with no image at all (blacked out) can still get a high "perceptual megapixel" number on a high megapixel camera. Also, ranking by some arbitrarily defined number is ridiculous, especially for lenses of different focal lengths. They would not be used for the same thing. Give it a personal rating if you want ("5 stars" or whatever) based on how you think a lens of that range should perform, but arbitrary ranking numbers do nothing but fuel nonsense debates like "my 75mm is better than your 24mm". Give us the actual numbers and data DXO, not some pretty, colorful gradient bars based on silly aggregated numbers. We're big boys and girls, we can handle it.

Anyway, Lenstip now has their review for this lens up: Sigma A 50 mm f/1.4 DG HSM review - Introduction - Lenstip.com. A lot more information you can get out from that.

But again, this isn't coming to K-mount as far as anyone knows, so...


Last edited by Cannikin; 04-17-2014 at 03:03 PM.
04-17-2014, 02:50 PM   #189
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QuoteOriginally posted by Cannikin Quote
DXO lens evaluation/ranking methodology is very poorly thought out by attempting to aggregate all information into some meaningless singular numbers. The most shocking thing to me is this is even their written goal. Very little relevant information can be extracted from them. For instance a lens with a crazy sharp center, but borders with no image at all (blacked out) can still get a high "perceptual megapixel" number on a high megapixel camera. Then there's the fact that they only consider the "best" focal length/aperture combination, so good luck figuring out what it's like at any other aperture. Also, ranking by some arbitrarily defined number is ridiculous, especially for lenses of different focal lengths. They would not be used for the same thing. Give it a personal rating if you want ("5 stars" or whatever) based on how you think a lens of that range should perform, but arbitrary ranking numbers do nothing but fuel nonsense debates like "my 75mm is better than your 24mm". Give us the actual data DXO, kinda like the charts you provide with sensor evaluations. We're big boys and girls, we can handle it.

Anyway, Lenstip now has their review for this lens up: Sigma A 50 mm f/1.4 DG HSM review - Introduction - Lenstip.com. A lot more information you can get out from that.

But again, this isn't coming to K-mount as far as anyone knows, so...
Looks like it'll produce great bokeh circles from that lenstip review.
04-17-2014, 07:16 PM   #190
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Sharpity sharpity sharp!!
04-19-2014, 05:33 AM   #191
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QuoteOriginally posted by Winder Quote
Now if Pentax would redesign the DA* 55mm F/1.4 with a faster AF motor and improve its optical performance.

Or maybe Pentax needs to produce a D-FA* 50mm F/1.2 for the upcoming full frame.
I'd prefer a 55/1.2 (84/1.8 equiv. on APS-C).
04-21-2014, 03:30 PM   #192
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QuoteOriginally posted by Boris_Akunin Quote
I'd prefer a 55/1.2 (84/1.8 equiv. on APS-C).
The 55 f1.4 works on FF already, which makes it a fantastic lens to go between the 85mmish FL and the normal prime FL on 35mm.

But yes, the motor is painfully slow! But I do enjoy using it on my MZ-7 a lot!


One thing I would love is for more DAL primes. faster, plastic, cheapish (sub $500) in 28, 35, 50, 85. Could all be f1.8. Hey, if Nikon can do it with the G series, Pentax should be able to! All FF too.


In other news, I preordered my Sigma 50 for my D800....and I don't know why.
04-21-2014, 04:07 PM   #193
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QuoteOriginally posted by Wired Quote
One thing I would love is for more DAL primes. faster, plastic, cheapish (sub $500) in 28, 35, 50, 85. Could all be f1.8. Hey, if Nikon can do it with the G series, Pentax should be able to! All FF too.
Heavens-ta-betsy!

Pentax has said they're not after lens speed. Your 1.8's in 35/28/85 would be equal to or exceed the 'best' Pentax lenses in/near those focal lengths.

Of course the 50/1.8 already exists; and with the 35/2.4 and 31/1.8 the 35/1.8 is unlikely.

--ElJamoquio, quasher of dreams...

(fortunately all of the lenses above are already FF...)
04-21-2014, 04:09 PM   #194
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QuoteOriginally posted by ElJamoquio Quote
Heavens-ta-betsy!

Pentax has said they're not after lens speed. Your 1.8's in 35/28/85 would be equal to or exceed the 'best' Pentax lenses in/near those focal lengths.

Of course the 50/1.8 already exists; and with the 35/2.4 and 31/1.8 the 35/1.8 is unlikely.

--ElJamoquio, quasher of dreams...

I know. It's very unfortunate that they are using the "ISO is good enough now" argument to not deliver higher speed primes. I'm sorry f4 isn't good enough for live bands sometimes. Even 2.8 can be slow!

But I do love me them FA limiteds!
04-21-2014, 09:10 PM   #195
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If we want professional grade, high speed lenses we are going to have to go for Sigma. Pentax has been clear they prefer small and slow (both aperture and AF).
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