GR+converter vs. GXR+ VC 15/4.5

Discussion about Ricoh GR

GR+converter vs. GXR+ VC 15/4.5

Postby riccadonna » Thu Oct 29, 2015 4:51 pm

Yesterday my canadian friend Pentax and Ricoh aficionado lent me his GW-3 to play with. I was especially interested in comparison with my trusty VC 15/4.5. Here are some pictures all shot at f.5.6 ,
GR with converter looks nice a bit front heavy for me and of course with much bigger glass in front. Good addition for owner of GR even though handling wise I would rather prefer smaller chunk of VC 15/4.5. Yes it`s more then a stop slower and a bit wider ( 20mm vs, 23,5 ) which might be advantage in some situations. Stanislaw
R0038997web.jpg
R0038997web.jpg (340.31 KiB) Viewed 1134 times

EXIF-Data
Image taken on: Thu Oct 29, 2015 2:54 pm
Shutter speed: 1/1 Sec
F-number: F/1
ISO speed rating: 200
Whitebalance: Auto
Flash: Flash did not fire, compulsory flash mode
Camera-model: GXR MOUNT A12
Exposure program: Aperture priority
Exposure bias: -10/10 EV
Metering mode: Spot
R0034068web.jpg
R0034068web.jpg (463.11 KiB) Viewed 1138 times

EXIF-Data
Image taken on: Thu Oct 29, 2015 2:35 pm
Shutter speed: 1/100 Sec
F-number: F/1
ISO speed rating: 200
Whitebalance: Auto
Flash: Flash did not fire, compulsory flash mode
Camera-model: GXR MOUNT A12
Exposure program: Aperture priority
Exposure bias: -10/10 EV
Metering mode: Center-weighted average
GR001433web.jpg
GR001433web.jpg (407.69 KiB) Viewed 1148 times

EXIF-Data
Image taken on: Thu Oct 29, 2015 2:23 pm
Focus length: 18.3 mm
Shutter speed: 1/80 Sec
F-number: F/5.6
ISO speed rating: 200
Whitebalance: Auto
Flash: Flash did not fire, compulsory flash mode
Camera-model: GR
Exposure program: Aperture priority
Exposure bias: -7/10 EV
Metering mode: Center-weighted average
R0034068webcento.jpg
100%
R0034068webcento.jpg (592.18 KiB) Viewed 1135 times

EXIF-Data
Image taken on: Thu Oct 29, 2015 2:35 pm
Shutter speed: 1/100 Sec
F-number: F/1
ISO speed rating: 200
Whitebalance: Auto
Flash: Flash did not fire, compulsory flash mode
Camera-model: GXR MOUNT A12
Exposure program: Aperture priority
Exposure bias: -10/10 EV
Metering mode: Center-weighted average
GR001433webcento.jpg
100%
GR001433webcento.jpg (349.35 KiB) Viewed 1124 times

EXIF-Data
Image taken on: Thu Oct 29, 2015 2:23 pm
Focus length: 18.3 mm
Shutter speed: 1/80 Sec
F-number: F/5.6
ISO speed rating: 200
Whitebalance: Auto
Flash: Flash did not fire, compulsory flash mode
Camera-model: GR
Exposure program: Aperture priority
Exposure bias: -7/10 EV
Metering mode: Center-weighted average
GR001428web.jpg
a selfie at arms length
GR001428web.jpg (251.53 KiB) Viewed 1142 times

EXIF-Data
Image taken on: Thu Oct 29, 2015 10:16 am
Focus length: 18.3 mm
Shutter speed: 1/60 Sec
F-number: F/2.8
ISO speed rating: 800
Whitebalance: Auto
Flash: Flash did not fire, compulsory flash mode
Camera-model: GR
Exposure program: Not defined
Exposure bias: -7/10 EV
Metering mode: Center-weighted average
GR001407web.jpg
I`m split about the results
GR001407web.jpg (408.12 KiB) Viewed 1140 times

EXIF-Data
Image taken on: Wed Oct 28, 2015 8:32 pm
Focus length: 18.3 mm
Shutter speed: 1/100 Sec
F-number: F/5.6
ISO speed rating: 3200
Whitebalance: Auto
Flash: Flash did not fire, compulsory flash mode
Camera-model: GR
Exposure program: Not defined
Exposure bias: -13/10 EV
Metering mode: Center-weighted average
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Re: GR+converter vs. GXR+ VC 15/4.5

Postby thelps » Fri Oct 30, 2015 3:06 am

Thanks Stanislaw for going to the trouble to test this.
Its an interesting and valid question.

From your samples it seems to me that there is more barrel distortion in the GR/21 than the GXR/15.
I feel like the samples showing the windows exhibit a bit more CA although its pretty minor.

If I had to pick a winner on technicality I think perhaps the GXR would for me, and that is IMO.
The GR/21 is not bad though.

I have pondered how to get 21mm angle of view (90 degree) with more than 16Mpixel and APSC size at an affordable cost and there are not many options.
Tim
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Re: GR+converter vs. GXR+ VC 15/4.5

Postby riccadonna » Fri Oct 30, 2015 12:03 pm

Tim, GW-3 has more barrel distortion, that`s a fact. There`s possibility in Set up to use converter setting which I forgot to use. I think it corrects in camera barrel distortion and vigneting. I guess it good for JPGS as the RAW/DNG is normally unaffected. As for 21mm APS-C 16 MP plus option would be Pentax SII and DA 15/4. My canadian friend who lend me GW-3 has whole collection of DA primes including 15/4. Would be interesting to compare it against these two. As to sharpness, well GR is 16MP which should give it a little edge over GXR 12MP, but as said, with careful shooting and editing technics it`s amazing how much you can pull out of the older sensors.
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Re: GR+converter vs. GXR+ VC 15/4.5

Postby riccadonna » Mon Nov 02, 2015 3:47 pm

An example for usefulness of 20/21 focal lens. I haven`t yet time or idea how to put GW-3 to some serious challenge but one day I noticed some discarded cardbords with spectacle cutouts ( on other side there was a text about political shortsightness :( ).
Well there was an idea but as I was in hurry to my Sunday mass, I had time only for few shots illustrating that even stopping lens dow to f:8 you can`t get both things sharp, to get both in more or less focus one has to stop the lens all way down and use hyper focal distance.
Without GW-3 I hardly could get whole cardboard in frame and even doing so the cutout would show much less of the background. Well VC 12/5,6 ( 18mm eq. ) would be even better but that`s another story ( I don`t have it, alas :cry: ). Stanislaw
GR001447web.jpg
GR001447web.jpg (379.55 KiB) Viewed 969 times

EXIF-Data
Image taken on: Sun Nov 01, 2015 11:37 am
Focus length: 18.3 mm
Shutter speed: 1/200 Sec
F-number: F/16
ISO speed rating: 4000
Whitebalance: Manual
Flash: Flash did not fire, compulsory flash mode
Camera-model: GR
Exposure program: Not defined
Exposure bias: 0 EV
Metering mode: Center-weighted average
Attachments
GR001445web.jpg
GR001445web.jpg (300.5 KiB) Viewed 943 times

EXIF-Data
Image taken on: Sun Nov 01, 2015 11:35 am
Focus length: 18.3 mm
Shutter speed: 1/200 Sec
F-number: F/8
ISO speed rating: 400
Whitebalance: Manual
Flash: Flash did not fire, compulsory flash mode
Camera-model: GR
Exposure program: Not defined
Exposure bias: 0 EV
Metering mode: Center-weighted average
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Re: GR+converter vs. GXR+ VC 15/4.5

Postby AlbertTRAL » Thu Nov 05, 2015 10:01 am

Thanks for the tests Stanislaw. These CVs are really little jewels... I also have the 15 for the GXR, but with the 12 in the list (and I must be quick because they have already announced the retrofocal 12 (type III))... and now ¡also the 10mm! but obviously with a new much more retrofocal design to cope with the digital sensors filter stack as the 12 (III) and the 15 (III)... ;)
Take care, AlbertTRAL
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Re: GR+converter vs. GXR+ VC 15/4.5

Postby riccadonna » Thu Nov 05, 2015 11:16 am

AlbertTRAL. I´m exited about 10mm too. That would be my ultimate wide. They are not easy to use due to geometric distortion but there are software filters correcting that. For general use GR 28mm is just about the widest one can go with heads close to the edge of frame. GXR m-module is coping reonably well with nonretrofocus lenses ( not all ) due to it`s Leica like mocroprisms on sensor. The new versions of 15mm and 12mm are bigger and more expensive. Yes they are said to be better at edges but using the old ones on APS-C helps with the old ones.
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