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

Discussion about Ricoh GXR system

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

Postby odklizec » Wed Dec 15, 2010 10:20 pm

Thanks for even detailed test Gerd! Closing the aperture down definitely helped. However, the DW6 still does not appear to be as usable as GW2. Even the GW2 needs to be stopped down for best performance. It may be usable for street shooting and in certain extent also for landscapes. I tried it inside with limited light and the results are too soft at f2.5. I will give it a more try at f4.
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Re: GXR A12 28mm + extension lenses (DW6, GW2, GT1, TC1)

Postby waloszek » Wed Dec 15, 2010 10:33 pm

Hi Pavel!
This is the stepup ring that I bought via Amazon from Foto Oehling:
http://www.amazon.de/Hama-Spezial-Adapt ... 872&sr=1-1
I still have to measure it... Anyway, you are definitely right in stating that the distance also plays a role.

I agree that the DW-6 is not a real option. But I do not think that I will by a GW-2...
Let's see what your tests at f4 will bring!

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

Postby odklizec » Thu Dec 16, 2010 1:44 am

Sure thing, buying GW2 just for A12 28mm is meaningless. The results are probably not worth such investment? But I think it's very good option for people who already own such extension lens?
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Re: GXR A12 28mm + extension lenses (DW6, GW2, GT1, TC1)

Postby HaroldGlit » Fri Feb 18, 2011 3:07 pm

Hello Pavel

Thank you for the posting. 40mm FOV is my favorite focal length. Can you tell me if the image you posted had been sharpened at post processing. and is it an image in 4;3 or 3;2 ratio . It looks like in between ?
what do you think is the largest aperture to get decent , printable results with that GT1 extension ?

Thank you
:P

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

Postby odklizec » Fri Feb 18, 2011 3:29 pm

Hi Harold,

You are welcome! All these pictures are unprocessed (previews are just scaled down). Except the TC1 shot, all were taken in 3:2 mode. Sharpest aperture appears to be f8. Anything above/beyond this value starts to look softer, with pretty soft corners at f2.5 and overall soft photos at f22. However, I think you can get reasonable (printable) results even at f2.5. Just make sure the corners are a part of out of focus area and don't print larger than album sized photos ;)
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Re: GXR A12 28mm + extension lenses (DW6, GW2, GT1, TC1)

Postby Randius » Sat Jan 07, 2012 2:29 am

So the GW2 is still better to be used on the GRD 3/4? I have the GW2 and tried to find the step-up ring but cannot find it here in Singapore. Read somewhere that using the GW2 on the 28mm A12 will stress the AF motor and is not really recommended.
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Re: GXR A12 28mm + extension lenses (DW6, GW2, GT1, TC1)

Postby odklizec » Sat Jan 07, 2012 10:12 am

Yes, the GW2 is still best to use with the GRD. However, it can produce some decent results also with the A12 28mm. All you need to do is to use higher aperture numbers to improve the corners. As for the effect on AF motor, I wouldn't worry much about this. The weight of the GW2 is not that significant to have any noticeable impact on the AF motor. At least I did not notice any problem. Of course, while it's not officially supported and recommended GXR extension, it's your call and responsibility ;) The only extension lens I was worry to use with the A12 module was the gigantic Olympus TCON tele converter. But its weight was like the weight of GXR body + module together ;)
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Re: GXR A12 28mm + extension lenses (DW6, GW2, GT1, TC1)

Postby robbie_d » Fri Mar 22, 2013 2:07 am

Hmmm, I really do want the A12 28mm...!
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Re: GXR A12 28mm + extension lenses (DW6, GW2, GT1, TC1)

Postby Gyl » Sun May 25, 2014 2:31 pm

I was tempted by a GXR + A12, and I am surprised and seduced all the more as the accessories (GW-2) of my GRD III would go above.
Happy GR Digital user
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