GRDII vs. GX100 ISO test

Discussion about Ricoh GR Digital II

GRDII vs. GX100 ISO test

Postby odklizec » Tue Dec 18, 2007 12:27 am

Here is the GRDII/GX100 ISO performance comparison. Few comments..
The 28mm seems to be not the same in GRDII and GX100, hence the difference in angle of view.
The closest GX100 aperture to GRD at 28mm is f2.7 (GRD is at 2.8).
All JPEG settings are set to 0 (default).
DNG files processed with dcraw using these command line parameters: -w -W -f -q 3 -T
I believe this sequence provides probably the best (and neutral) image quality. Other RAW developers are doing more or less optimizations, which affects the image output. So I've decided to go the dcraw way. In fact, most of RAW development tools are more or less based of dcraw ;)

ISO 400
Image

ISO 800
Image

ISO 1600
Image

My conclusion:
GRDII RAW is slightly less noisy than GX100 RAW.
GX100 RAW files contains some "hot" pixels that are not visible in GRDII RAW files. This is only a small example. The GX100 DNG files are full of these small spots. But of course, they are only visible at 100% magnification (aka pixel peeping) ;)
Image
GX100 preserves a bit more highlights.
Image
GX100 JPEG is over sharpened (my recommendation is set sharpening to -2)
GRD2 JPEG is heavily processed with NR, even with NR set to OFF. The NR artifacts are visible in all shots above ISO100.

From what I've seen, I tend to believe the GRDII uses different sensor than GX100. Maybe just another generation of the GX100 sensor, which is less noisy, but also less highlight friendly?

Full resolution images can be downloaded here:
GRD2 DNG (use 7zip to extract the 7z files, MAC users should have to use one of >these<)
R0012151_80.7z
R0012152_100.7z
R0012153_200.7z
R0012154_400.7z
R0012155_800.7z
R0012156_1600.7z

GRD2 JPEG
R0012151_80.jpg
R0012152_100.jpg
R0012153_200.jpg
R0012154_400.jpg
R0012155_800.jpg
R0012156_1600.jpg

GX100 DNG
R0012107_80.7z
R0012108_100.7z
R0012109_200.7z
R0012110_400.7z
R0012111_800.7z
R0012112_1600.7z

GX100 JPEG
R0012107_80.jpg
R0012108_100.jpg
R0012109_200.jpg
R0012110_400.jpg
R0012111_800.jpg
R0012112_1600.jpg
Pavel Kudrys
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Re: GRDII vs. GX100 ISO test

Postby asabet » Tue Dec 18, 2007 2:40 am

This is really great work Pavel. Thanks for sharing these!
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Re: GRDII vs. GX100 ISO test

Postby jorgeAD » Tue Dec 18, 2007 7:11 pm

Very interesting indeed...! Thanks Pavel. I already went the GRD2 route, yet I think many people will find this test a very useful one. I now understand why the GX100 has got such a following. It is a great camera in its own right. And I can think of just a few instances where the GRD2 is slightly ahead:

1. When shooting RAW (faster record times and buffer + in-camera JPG noise reduction is horrible in the GRD2.. Ricoh should do something about it ASAP...)

2. When printing larger than 11x14" with a subject requiring low distortion and high detail out to the corners (landscape, architecture, some types of street photography)

3. Folks regularly converting to B&W, since once the chroma information is taken out of the equation, the extra resolution in the GRD2 lens is likely to become more noticeable.

But thats it... the rest is pretty much GX100 territory...!

I think the highlight detail is small enough to be due to a slightly higher contrast lens desing... as it happens with the aspherical VS. pre-aspherical leica lenses (remember the GRD2 has TWO aspherical elements, quoting from the GRD2 brochure "to compensate for various types of aberrations and vignetting on the subjects periphery - areas that are particularly problematic- to provide outstanding sharpness and high contrast all the way to the corners of the image" )...

But then again the sensors are behaving diferently as far as resolution (lens dependent?) and hot pixels(aging sensor).. so who's to know for sure...?
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Re: GRDII vs. GX100 ISO test

Postby rashomon » Wed Dec 19, 2007 8:39 am

Rather than GX100 preserving better highlights, looks to me like the GRDII is .3 stop more sensitive than the GX100.
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Re: GRDII vs. GX100 ISO test

Postby odklizec » Wed Dec 19, 2007 4:32 pm

I'm not quite sure about the higher GRD2 sensitivity (compared with GX100). The shutter times suggested both by GRD2 and GX100 are almost the same. The small difference is caused by a 0.1 difference in F number. Also, in terms of brightness, the images from both cameras appears to be about the same? Underexposing GRD2 for about 0.3 more would cause visible darker result?

Actually, the GX100 pics appear to by slightly brighter in shadows and still preserving some more details in highlights. Look at the samples here:
viewtopic.php?f=39&t=553#p2326

Sean Reid suggested more contrast GRD2 lens, which may be an answer on more darker shadows and slightly more clipped highlights in case of GRD. I think I will have to do a more precise dynamic range test. Too bad it's not possible to set the same F number for both cameras.
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Re: GRDII vs. GX100 ISO test

Postby rashomon » Thu Dec 20, 2007 6:21 am

I suggested that the GRDII might be tiny bit more sensitive exactly because the GRDII image looks to be a bit more exposed than the GX100 image. If you compare the detail under the cap of the mushroom bottle, you can see that the GX100 has more shadow than the GRDII. That point, along with the lesser highlights, suggest to me that the GX100 image is a bit underexposed.

I've also looked at the other images in the link you've provided, the GRDII images does seem to be more contrasty compared to the GX100. I would guess that since the two camera share the same sensor, this would be due to the lens of the GRDII.

Cheers.
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Re: GRDII vs. GX100 ISO test

Postby jevoncarlson » Thu Jan 03, 2008 4:29 am

I've noticed that the raw files from the GRDII have a brightness setting of +50 and a contrast setting of +25 in lightroom at import.
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