GXR A12 28mm + extension lenses (DW6, GW2, GT1, TC1)

Discussion about Ricoh GXR system

GXR A12 28mm + extension lenses (DW6, GW2, GT1, TC1)

Postby odklizec » Sun Dec 05, 2010 11:45 pm

Here is a quick test of usability of the A12 28mm with mounted Ricoh wide/tele extension lenses. Of course, none combination matches the original image quality and corner sharpness of the 28mm lens. However, there are some surprises ;)

The best combination seems to be the A12 28mm + GW2. It was a bit of surprise to me because from my previous test with GRDIII, the GW2 appeared to be slightly less sharp than DW6. With A12 28mm it looks very usable in case one needs something wider than 28mm? The DW6 makes the A12 28mm smaller and lighter, but at pixel level you can clearly see the corner degradation.

The second surprise to me was the GT1. Previous GRDIII test proved that the GT1 is unfortunately useless with GRDIII because of heavy corner unsharpness. And with A12 50mm it turned the very fine GR lens into a lensbaby kind of glass, good only for special occasions. However, with A12 28mm it appears to be way better than with GRDIII. True, there is still some unsharpness visible in corners. But it's not that bad and can be further improved by shooting in 4:3 mode.

The TC1, as I expected, is in my opinion a waste of time. It shows heavy corner vignetting even in 1:1 mode. True, the central sharpness is not bad, but I see no good reason to use this lens with A12 28mm? ;)

Here you can see how the A12 28mm look with attached lenses. If viewed on 1440x900 or equivalent resolution on 15" LCD, you can get an impression of nearly 100% size of the camera with attached lens.
A1228_gw2.jpg
GXR A12 28mm + GW2 (21mm)
A1228_gw2.jpg (344.77 KiB) Viewed 26366 times

A1228_dw6.jpg
GXR A12 28mm + DW6 (22mm)
A1228_dw6.jpg (331.01 KiB) Viewed 26426 times

A1228_gt1.jpg
GXR A12 28mm + GT1 (40mm)
A1228_gt1.jpg (321.42 KiB) Viewed 26360 times

A1228_tc1.jpg
GXR A12 28mm + TC1 (53mm)
A1228_tc1.jpg (322.27 KiB) Viewed 26714 times


And here are the views (starting from the most wide):
A1228_21mm_sm.jpg
21mm (GW2)
A1228_21mm_sm.jpg (364.49 KiB) Viewed 26899 times

EXIF-Data
Image taken on: Sat Dec 04, 2010 1:15 pm
Focus length: 18.3 mm
Shutter speed: 1/380 Sec
F-number: F/8
ISO speed rating: 200
Whitebalance: Manual
Flash: Flash did not fire, compulsory flash mode
Camera-model: GXR A12
Exposure program: Aperture priority
Exposure bias: 7/10 EV
Metering mode: Pattern
Full sized photo can be seen here
A1228_22mm_sm.jpg
22mm (DW6)
A1228_22mm_sm.jpg (357.06 KiB) Viewed 26787 times

EXIF-Data
Image taken on: Sat Dec 04, 2010 1:16 pm
Focus length: 18.3 mm
Shutter speed: 1/380 Sec
F-number: F/8
ISO speed rating: 200
Whitebalance: Manual
Flash: Flash did not fire, compulsory flash mode
Camera-model: GXR A12
Exposure program: Aperture priority
Exposure bias: 7/10 EV
Metering mode: Pattern
Full sized photo can be seen here
A1228_28mm_sm.jpg
28mm
A1228_28mm_sm.jpg (407.27 KiB) Viewed 26634 times

EXIF-Data
Image taken on: Sat Dec 04, 2010 1:12 pm
Focus length: 18.3 mm
Shutter speed: 1/380 Sec
F-number: F/8
ISO speed rating: 200
Whitebalance: Manual
Flash: Flash did not fire, compulsory flash mode
Camera-model: GXR A12
Exposure program: Aperture priority
Exposure bias: 7/10 EV
Metering mode: Pattern
Full sized photo can be seen here
A1228_40mm_sm.jpg
40mm (GT1)
A1228_40mm_sm.jpg (440.97 KiB) Viewed 26770 times

EXIF-Data
Image taken on: Sat Dec 04, 2010 1:19 pm
Focus length: 18.3 mm
Shutter speed: 1/270 Sec
F-number: F/8
ISO speed rating: 200
Whitebalance: Manual
Flash: Flash did not fire, compulsory flash mode
Camera-model: GXR A12
Exposure program: Aperture priority
Exposure bias: 7/10 EV
Metering mode: Pattern
Full sized photo can be seen here
A1228_52mm_sm.jpg
52mm (TC1)
A1228_52mm_sm.jpg (489.6 KiB) Viewed 26752 times

EXIF-Data
Image taken on: Sat Dec 04, 2010 1:20 pm
Focus length: 18.3 mm
Shutter speed: 1/270 Sec
F-number: F/8
ISO speed rating: 200
Whitebalance: Manual
Flash: Flash did not fire, compulsory flash mode
Camera-model: GXR A12
Exposure program: Aperture priority
Exposure bias: 7/10 EV
Metering mode: Pattern
Full sized photo can be seen here
Pavel Kudrys
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Re: GXR A12 28mm + extension lenses (DW6, GW2, GT1, TC1)

Postby waloszek » Mon Dec 06, 2010 11:56 am

Hi Pavel!
You did it again! Thank you for your new converter experiments! I did some hand-held test tests, too, last week, but they were not very convincing. So I ordered a step-up ring (will arrive this week...). But now you answered already all my questions!

Earlier this year, I did some hand-held tests with DW6 and TC1, which were also not convincing. Perhaps I will be able to take some lensbaby-type shots with the TC1 -- e.g. self portraits ;) .

As you write, the TC1 does not make any sense at the A12-28, resulting in a focal length of about 52mm... It would make more sense, however, when attached at the A12-50, providing a focal length of 90-100mm -- that's close to the portrait lens some people are asking for.

Thus, with a little re-work on its converters, Ricoh could tease the waiting crowd a little bit and offer them extensions at the wide and at the tele end ;) .

Best regards, Gerd
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Re: GXR A12 28mm + extension lenses (DW6, GW2, GT1, TC1)

Postby Wiener » Mon Dec 13, 2010 6:06 pm

Very interesting test, Pavel! :)
It would seem an excelent idea for me to try the DW6 I use with the GX 100 on the A12 28mm. Would you confirm what I need to adapt one to the other? Any particular product you would recommend would also be useful...
Many thanks,
Andy
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Re: GXR A12 28mm + extension lenses (DW6, GW2, GT1, TC1)

Postby waloszek » Mon Dec 13, 2010 7:23 pm

I just bough a HAMA stepup ring (40,5 to 43mm) at Foto Öhling (via Amazon). But looking at my recent test photos that still need to be looked at more closely and published here and on my Website, it look as if it were not really worth the 10 Euros...
Best regards, Gerd
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Re: GXR A12 28mm + extension lenses (DW6, GW2, GT1, TC1)

Postby Wiener » Mon Dec 13, 2010 11:14 pm

Thanks for your advice, Gerd.
I think I will therefore 'watch this space' before I spend by €!
Andy
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Re: GXR A12 28mm + extension lenses (DW6, GW2, GT1, TC1)

Postby odklizec » Mon Dec 13, 2010 11:42 pm

Hi Gerd,
I'm sorry to hear about your unsatisfactory results! I bought a no-name 40.5-43 ring for just $2.96 on ebay. True, cheap Chinese rings have mixed quality. I have one 40.5 to 46mm that works fine with A12 50, but not with A12 28. And I don't think there is a problem with A12 28mm filter thread, because other 40.5 rings work fine. I look forward for your results.
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Re: GXR A12 28mm + extension lenses (DW6, GW2, GT1, TC1)

Postby waloszek » Mon Dec 13, 2010 11:44 pm

Here is a first page: http://www.waloszek.de/gxr_conv_a12_e.php
Best regards, Gerd
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Re: GXR A12 28mm + extension lenses (DW6, GW2, GT1, TC1)

Postby odklizec » Tue Dec 14, 2010 12:33 am

Thanks for your test Gerd! I think a part of the difference between your and mine sample lies in different aperture. I shoot all my samples with F8, which should be noticeably sharper than f2.8 or f3.2 used in your samples. And this is probably why your A12+DW6 photos look softer with more degraded corners? I'm curious what's the height of your 40.5-43 ring? Different distance between the A12 lens and DW6 could play a bit of role too?
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Re: GXR A12 28mm + extension lenses (DW6, GW2, GT1, TC1)

Postby waloszek » Tue Dec 14, 2010 9:47 am

Hi Pavel!
I think that's exactly the point! I made also DW-6 tests with A12-28 (and 50 I think...), but did not find the time to have a closer look at them -- and to publish them...
Best regards, Gerd
PS: The comment about the 10 EUR was about the results, not the step-up ring. But it is indeed a little bit difficult to start screwing, that is, find the correct starting point for screwing...
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Re: GXR A12 28mm + extension lenses (DW6, GW2, GT1, TC1)

Postby waloszek » Tue Dec 14, 2010 10:45 pm

Hi all,
I am not sure whether everything is already correct, but I added a second page to my A12 converter experiments on which I show samples with different aperture values: http://www.waloszek.de/gxr_conv_a12-2_e.php
These samples also explain the different conclusions that Pavel and I arrived at (at about f8, we are in line...).
Best regards, Gerd
P. S.: I am not sure whether I will find the time to publish samples here (for easier access...)
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