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next PZ lens test report: Sigma 12-24mm f/4 HSM DG ART
#1
It started promising ... but then it ended in ... perhaps not.

 

http://www.opticallimits.com/canon_eos_f...a1224f4art

#2
excellent cliffhanger! "but then...*  ^_^

 

"the the borders"

#3
Thanks for your test and findings. We obviously didn't have the same lens and I tried it only less than half an hour, but I thought I was seeking for flares, ghostings, fringing and all the stuff I knew from the Nikkor - and I was positively "disappointed" not to find these, at least not in a all too obvious way. But maybe I was too careful? When looking at my pictures in the range of 18-24 mm I could not see fiel curvature - but then, the idea occurred when the subject is perspectively, that curvature might even help to increase DoF?

 

Edit: I was looking at your 7 sample pictures and hoping to find some "ghostings" to proof of curvature. Not to defend the lens - I just want to know what it looks like your were talking about?

#4
Ew...

 

Looks like an f/4-5.6 lens after all. Smile But I guess for many people it'll be practically a 12mm prime anyway. Tongue (but then, the distortion... ZOMG)

 

P. S. No 21MP results this time around?

#5
There are no 18 or 24mm sample images (except a leaf close up), so a bit difficult to look for the field curvature there...

#6
Quote:Ew...

 

Looks like an f/4-5.6 lens after all. Smile But I guess for many people it'll be practically a 12mm prime anyway. Tongue (but then, the distortion... ZOMG)

 

P. S. No 21MP results this time around?
For prime, I'd rather look at the Irix 11mm f4 instead Wink
#7
          Very good real world review, especially given the detailed info on the lens's field of curvature which causes a little "mayhem" at the longer focal lengths, most reviews mention nothing of that genre.

    I'm not sure if a compromise setting, (putting the focus point at the 1/1/3rd of the way from the frame edge) would help ease the corner/ edge situation,  probably? 

 

  Huge lens though and heavy at 1.15 Kgs....this is a lens you can get round by using two lighter primes or a prime and a zoom, there's the Samyang 14mm F2.8,  (one stop brighter for peanuts for example)   

 

 On a trip this lens would be a pain to carry coupled added to your standard kit!

Dave's clichés
#8
Quote:For prime, I'd rather look at the Irix 11mm f4 instead Wink
No AF, no sell for me (YMMV of course). I'd like to see a 12mm AF prime from someone to replace my 14mm Sigma (which is not stellar in itself, albeit passable, but also comes a little too close in the FL department to the 16-35mm lens that I call my bread and butter unit...)

 

Tamron, I'm looking at you.

#9
Quote:No AF, no sell for me (YMMV of course). I'd like to see a 12mm AF prime from someone to replace my 14mm Sigma (which is not stellar in itself, albeit passable, but also comes a little too close in the FL department to the 16-35mm lens that I call my bread and butter unit...)

 

Tamron, I'm looking at you.
Klaus mentions that the Sigma tends to overshoot AF?
#10
Quote: 

          Very good real world review, especially given the detailed info on the lens's field of curvature which causes a little "mayhem" at the longer focal lengths, most reviews mention nothing of that genre....
 

Actually, I would like see some evidence how it looks like and how big's the impact. 7 samples are not a lot, I was scrolling through 48 pictures (less than an hour? ha! 20 minutes - so really nothing to call it a test) and simply could not see these problems in real world. But I realized I have less high expectations on sharpness as there is so much to be seen on the picture - I simply didn't bother enough to see the structures of leaves close to the lens' ∞ position.

 

Although I tried the lens, I also think of looking at the Irix would be worth to do. As for lack of AF: I haven't tried a DLSR-body (so far) which had no troubles to AF these UWA reliably. Apparently the grass is not much greener at the Canon side of the hills, and I think there are not much subjects in UWA situations which are moving so quickly. Personally, I don't see the value of PDAF in that region to be a ,must have'.
  


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