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08-31-2013, 07:22 PM   #406
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QuoteOriginally posted by close-enough Quote
Digitalis,

At the Lensrentals blog they tested 8 copies of the Sigma 30 1.4 art and compared it to 6 copies of the previous Sigma 30 and the new Sigma 35 1.4 art (which they rave about as you do). Note, however, they make a more balanced assessment of the differences in quality. More many Pentax is about compact lenses. For many the FOV of the 30mm is a better choice.

On a separate matter, Digitalis, would you prefer the new Sigma 35 to the Pentax FA 31?



LensRentals.com - Sigma 30mm f/1.4 DC HSM vs. Sigma 30mm f/1.4 EX DC
I think I read somewhere that he still like the 31 more. Because of compactness and bokeh (I think I read that somewhere, correct me if I'm wrong.)

08-31-2013, 07:26 PM   #407
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QuoteOriginally posted by close-enough Quote
On a separate matter, Digitalis, would you prefer the new Sigma 35 to the Pentax FA 31?
I prefer the FA31, though I am prepared to admit I am biased towards lenses with aperture rings. In terms of optical quality there really isn't a massive difference between them but I would wager the pentax lens would have considerably better flare resistance in comparison to the sigma lens.
09-02-2013, 10:39 AM   #408
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Just tested by Digital Photography Review:

Sigma 18-35mm F1.8 DC HSM Review: Digital Photography Review

Pros:
  • Super fast constant F1.8 maximum aperture
  • Excellent optics, even wide open
  • Fast, silent autofocus
  • Solid build quality without being over-heavy
  • Compatible with Sigma's USB dock and Optimization Pro software
Cons:
  • Restricted zoom range
  • Needs detailed AF microadjustment for best results
  • Inconsistent autofocus in difficult conditions even after microadjustment
  • Physically rather large for a standard zoom
"Sigma has been on something of a roll recently, with lenses like the 35mm F1.4 offering excellent optics at a very competitive price, and it's clear from both technical tests and real world shooting that the 18-35mm F1.8 is following on in much the same vein. Its relatively narrow zoom range is undeniably a little restrictive, but on the other hand, the image quality it can offer over that range is absolutely stellar. It's let down a little by inconsistent autofocus, which makes it difficult to get consistently sharp results every time when shooting wide open. But if you're prepared to live with this, the 18-35mm is capable of delivering truly exceptional results."

09-02-2013, 09:18 PM   #409
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Maybe they would want to sell more USB dock too.

09-02-2013, 09:51 PM   #410
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QuoteOriginally posted by Mistral75 Quote
Just tested by Digital Photography Review:

Cons:
  • Restricted zoom range
  • Needs detailed AF microadjustment for best results
  • Inconsistent autofocus in difficult conditions even after microadjustment
  • Physically rather large for a standard zoom
Seems petty to me.
09-02-2013, 10:30 PM   #411
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QuoteOriginally posted by SpecialK Quote
Seems petty to me.
To me, it's a warning sign. My K-5's focus is ALREADY inconsistent under the best circumstances.
09-03-2013, 06:56 AM   #412
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QuoteOriginally posted by SpecialK Quote
Seems petty to me.
Nah, they just pointed out all the things they didn't like. They clearly don't think those negatives ruin the lens, as it still got the "Gold Award."
09-03-2013, 07:02 AM   #413
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QuoteOriginally posted by scratchpaddy Quote
Nah, they just pointed out all the things they didn't like. They clearly don't think those negatives ruin the lens, as it still got the "Gold Award."
I think it gets a lot of kudos for being unique.

It's a very large piece of glass prone to substantial flare, with an iris/helicoid design that may exacerbate AF issues.

09-03-2013, 07:08 AM   #414
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QuoteOriginally posted by Aristophanes Quote
It's a very large piece of glass prone to substantial flare
Yeah, it's big, and it's no DA15, but DPReview doesn't agree with you on the flare:

QuoteQuote:
The 18-35mm does reasonably well with respect to flare, given its fast aperture and the sheer amount of glass used in its construction. In real-world use shooting in bright mid-summer sun we've not seen any obvious problems
09-03-2013, 07:11 AM   #415
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My DA*16-50's are both pretty prone to flare. If the Sigma is no worse it's a winner.
09-03-2013, 08:01 AM   #416
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QuoteOriginally posted by scratchpaddy Quote
Yeah, it's big, and it's no DA15, but DPReview doesn't agree with you on the flare:
Lenstips disagrees, with example photos:

Sigma A 18-35 mm f/1.8 DC HSM review - Ghosting and flares - Lenstip.com
09-03-2013, 08:11 AM   #417
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QuoteOriginally posted by Aristophanes Quote
Oooh, that's pretty nasty. Could be a game changer for me.
09-03-2013, 09:26 AM   #418
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QuoteOriginally posted by Mistral75 Quote
Just tested by Digital Photography Review:

Cons:
  • Needs detailed AF microadjustment for best results
  • Inconsistent autofocus in difficult conditions even after microadjustment
The review mentioned live view only briefly,
but I wonder if a good modern CDAF system
is able to give more consistent results.
09-03-2013, 11:24 AM   #419
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QuoteOriginally posted by lytrytyr Quote
The review mentioned live view only briefly,
but I wonder if a good modern CDAF system
is able to give more consistent results.
I would hope CDAF provides more consistent focusing but it's doubtful the lens would be used that way most of the time.
09-03-2013, 04:58 PM   #420
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QuoteOriginally posted by Quicksand Quote
To me, it's a warning sign. My K-5's focus is ALREADY inconsistent under the best circumstances.
QuoteOriginally posted by scratchpaddy Quote
Nah, they just pointed out all the things they didn't like. They clearly don't think those negatives ruin the lens, as it still got the "Gold Award."
Of course, but...

Restrictive zoom range - I have 2 lenses that only, or don't, get to 2X...
I believe all lenses would benefit from AF adjustment, hence that camera function, and dock option.
I think all lenses would have some AF problem in "difficult conditions".
It's not a standard zoom that is 2-3 stops slower.

That's all.
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