Donnerstag, 10. August 2017

"I like the SDQH"
Of course you do, you're a Reference Photographer for Sigma 😆😇

Donnerstag, 1. Juni 2017

High ISO comparison: Sigma sdQH (DNG) vs. dp1m @ ISO1600

Sigma sd Quattro H review (dpreview)

The DNG implementation seems to be poor and only usable at very low ISO:

Look at the difference between the sd Quattro H and the good old dp1 Merrill at ISO 1600:

Click for 100% 

Mittwoch, 24. Mai 2017

Quattro SFD mode still "Beta"

Quattros SFD mode still shows weird artifacts, even on static subjects.
Click for 100%

Forum comments are uncritically, as usual.

Montag, 15. Mai 2017 mal Butter bei die Fische

Eine Sigma sd Quattro H plus 50-100mm Art bei bestem Wetter sollte doch eigentlich eine Garantie fßr ansprechende Bildqualität sein.

Wie kommt dann so eine erbärmliche Bildqualität zustande? Und warum wird dies entweder nicht bemerkt oder schlicht nicht angesprochen?

Dienstag, 21. März 2017

Ongoing debate on DPREVIEW after a "Photo comparison between DP2M and new SDQ H with 35mm Art"

Big discussion on dpreview...
...about the "shadow quality" and colors based on a DP2m photo that is underexposed by 2 stops.

Exposure: Manual - 1/1000 - F6.3 - ISO: 200
...doesn't make any sense.

Samstag, 28. Januar 2017

Sigma sd Quattro H vs. Sigma sd1 Merrill image comparison

Maro provided an image comparison between the sdQH and the SD1 with the 85mm 1.4 Art lens:

At first, the images look quiet similar. But the statements in the dpreview forum are pretty harsh:
  • "SD1 looks sharper!"
  • "Not only sharper. In Quatro I see a lot of color artefacts."
  • "If the SD1 had live view and an EVF, it would be the better camera.  Certainly it produces a better image."
  • "Merrill was/is clearly outstanding!"
  • "This just makes me think what sort of fabulous camera a mirrorless SD Merrill H would have been."
  • "Once again the comparison show that 1:1:1 layers structure of the Foveon Merrill of the SD1 wins over the poor and rubbish 1:0.25:0.25 structure of the Quattro"
  • "The SD1M will be my last Foveon camera unless Sigma resurrects the Merrill chip in an improved body."
While the Quattro in general seems to have an edge regarding luminance resolution, many people
seem to prefer the look of the Merrill generation.
So what is it?

Maybe these 200% crops help to understand:
(click images for full resolution)

Clearly visible how destructive the default luma-noise reduction setting works with Quattro files,
but then luma-NR off shows how noisy the Quattro is on pixel level. 
So, finding the balance between noise reduction and adding/lowering sharpness is the tricky part with Quattro, while the Merrill sensor seems to be more forgiving and stable.  

Freitag, 20. Januar 2017

Fake-News? ;)

One user in the dpreview forum claims that the second shot is from an sdQ:

SDQ and A7R2

Exifs are crippled but there is no way that this image is from a Quattro.
(No offence, it's probably just a mistake)