[HELP] Sigma PD Merrill Foveon modification - Chinese speaking member help needed

Started 6 months ago | Questions
carrrlangas
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[HELP] Sigma PD Merrill Foveon modification - Chinese speaking member help needed
6 months ago

I am looking for someone who can answer some doubts for me from these page:

http://item.taobao.com/item.htm?spm=a1z10.1.w4004-2014437005.19.PeYoct&id=23787716835
Where the seller is offering the chance to modify a DP Merrill camera to adapt other lenses.
I have doubts about how will the camera operate after the conversion. As it seems, it´s possible to have a sony E mount so I can adapt any other lens through an adapter. Including Pentax lenses of course...

In this thread the seller has writen a lot of information at the bottom of page 10 and continues on page 11:
http://www.x3-club.com/forum.php?mod=viewthread&tid=26843&extra=&page=10
But I can´t fully understand all the information about the Sigma DP Merrill conversion which is the one I am interested in.

Without going further, perhaps some chinese speaking fellow member can help me out with translation to clear some doubts. I also need help to contact this man but that is for later.

My idea is to have a Sony E mount because it is has the shortest register distance and so allows the most type of lenses to be converted. I´d like to mount the DA limiteds through this PK-NEX adapter that has aperture control: http://amzn.com/B005ORIS4Y

Read more at: http://www.pentaxforums.com/forums/76-non-pentax-cameras-canon-nikon-etc/258549-help-sigma-pd-merrill-foveon-modification-chinese-speaking-member-help-needed.html#ixzz2zm7WNS9t

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vfan
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Re: [HELP] Sigma PD Merrill Foveon modification - Chinese speaking member help needed
In reply to carrrlangas, 6 months ago

carrrlangas wrote:

I am looking for someone who can answer some doubts for me from these page:

http://item.taobao.com/item.htm?spm=a1z10.1.w4004-2014437005.19.PeYoct&id=23787716835
Where the seller is offering the chance to modify a DP Merrill camera to adapt other lenses.
I have doubts about how will the camera operate after the conversion. As it seems, it´s possible to have a sony E mount so I can adapt any other lens through an adapter. Including Pentax lenses of course...

In this thread the seller has writen a lot of information at the bottom of page 10 and continues on page 11:
http://www.x3-club.com/forum.php?mod=viewthread&tid=26843&extra=&page=10
But I can´t fully understand all the information about the Sigma DP Merrill conversion which is the one I am interested in.

Without going further, perhaps some chinese speaking fellow member can help me out with translation to clear some doubts. I also need help to contact this man but that is for later.

My idea is to have a Sony E mount because it is has the shortest register distance and so allows the most type of lenses to be converted. I´d like to mount the DA limiteds through this PK-NEX adapter that has aperture control: http://amzn.com/B005ORIS4Y

Read more at: http://www.pentaxforums.com/forums/76-non-pentax-cameras-canon-nikon-etc/258549-help-sigma-pd-merrill-foveon-modification-chinese-speaking-member-help-needed.html#ixzz2zm7WNS9t

The maker will plan to E mount in the further.

http://www.x3-club.com/forum.php?mod=viewthread&tid=28668&extra=page%3D1

And, other one already made a E mount of DP3M.

http://forum.xitek.com/thread-1273688-1-1-1.html

But it is that shutter speed is limit on 1/500s.

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3dreal
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Re: [HELP] Sigma PD Merrill Foveon modification - Chinese speaking member help needed
In reply to vfan, 6 months ago

Limit to 1/500 only or quickest exposure?

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3dreal
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Re: [HELP] Sigma PD Merrill Foveon modification - Chinese speaking member help needed
In reply to 3dreal, 6 months ago

On the following pages one could see lenses attache to DP3M: e.g. eos 500/4 L

http://forum.xitek.com/thread-1273688-2-1-1.html

http://forum.xitek.com/pics/201403/168/16840/thumb_16840_1395366665.jpg

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3dreal
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Re: [HELP] Sigma PD Merrill Foveon modification - OM 50/2.8
In reply to 3dreal, 6 months ago
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vfan
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Re: [HELP] Sigma PD Merrill Foveon modification - Chinese speaking member help needed
In reply to 3dreal, 6 months ago

3dreal wrote:

Limit to 1/500 only or quickest exposure?

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It is the quickest exposure. (1/500s)

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3dreal
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Re: [HELP] Sigma PD Merrill Foveon modification - OM 50/2.8
In reply to 3dreal, 6 months ago

3dreal wrote:

http://forum.xitek.com/pics/201403/168/16840/thumb_16840_1394604684.jpg

Olympus OM 50/2.8

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Maybe 50/2.0 shot at 2.8

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rick decker
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English
In reply to carrrlangas, 6 months ago

There is an English translation or addition on the 1st link.  If it was there yesterday I missed it.  It talks about the process and is very interesting.

R

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3dreal
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Re: English-4880/4680 yuan
In reply to rick decker, 6 months ago

Y with = Yuan

DP3M-conversion EFM-infinity. Leica M costs 4880 Yuan

EF-Zr= 4680 yuan

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3dreal
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Re: English-4880/4680 yuan
In reply to 3dreal, 6 months ago

3dreal wrote:

Y with = Yuan

DP3M-conversion EFM-infinity. Leica M costs 4880 Yuan

EF-Zr= 4680 yuan

http://item.taobao.com/item.htm?spm=2013.1.0.0.1EIcMD&scm=1007.10011.531.0&id=36274660165&pvid=e046e29f-205e-44d5-a25a-3d46828ecd0b

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carrrlangas
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Re: [HELP] Sigma PD Merrill Foveon modification - Chinese speaking member help needed
In reply to vfan, 6 months ago

Thanks for your time to read through it. I am trying to contact the seller.

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carrrlangas
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Re: English-4880/4680 yuan
In reply to 3dreal, 6 months ago

thanks everyone for the info and interest. I think this would be the best mirrorless ever. It really offers a difference to DSLRs beyond size.

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docmaas
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Re: English-4880/4680 yuan
In reply to carrrlangas, 6 months ago

I'm having trouble deciphering whether he wants to proceed with the nex mount, the m39 or the leica m.  I hope it is the nex mount.

It appears that large focal plane distance lenses will only perform marginally in the corners while those designed to be closer to the film plane like konica, leica, contax g etc may be a better match for the dpm cameras.

I've always thought that Sigma should pursue this avenue but so far there have been no signs that they will.

I hope this does come to fruition.

Mike

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3dreal
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Re: English-4880/4680 yuan
In reply to docmaas, 6 months ago

Whats a focal plane distance lens?

I understand what you mean regarding register.

In the meantime, before the chinese conversion is available we will see a sigma-MIL.

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carrrlangas
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Re: English-4880/4680 yuan
In reply to docmaas, 6 months ago

DOCMAAS: "It appears that large focal plane distance lenses will only perform marginally in the corners while those designed to be closer to the film plane like konica, leica, contax g etc may be a better match for the dpm cameras."

Hmmm, I didn´t got to understanding this. Bummer, my point in all this is to use my Pentax K mount DA limited lenses, they have a register distance arround 40mm

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docmaas
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Re: English-4880/4680 yuan
In reply to carrrlangas, 6 months ago

I'm sorry if it sounded factual. My intent was to raise it as a question. In reading the English rendition of the Chinese it seemed to be saying that but the translation is awkward. Ironically I could probably decipher it if spoken but I only speak Chinese not read it.

I wonder if my impressions were correct though since sony nex camera resolution issues have been worse with short register wide angles than with longer register retroflex lenses from slrs.

There are two different ways problems arise concerning register and sensor. In a short register lens like the leica or contax g the problem can occur because of how obtuse the angles are when they impinge on the sensor. The shallower the angle the more difficult it is for the light to fall fully on the pixels at the extreme outside edges of the sensor. This is the problem with some short register wideangle lenses on some of the sony nex cameras. Wide angle retroflex design slr lenses work better because the angles to the edges of the sensor are more acute and the more acute the angle the more light can get into the pixel well over the lips of the pixel wall.

The other factor is how deeply inside the camera body the sensor lies and how wide the opening to the sensor is. The deeper and narrower it is the more of a tunnel effect there is and that results in light obstruction as well. If there is a tunnel problem then short register lenses might outperform the longer register lenses as they may get more light past the walls of the tunnel created by the body of the camera in relation to the sensor location.

I believe the lens itself creates the tunnel into the sensor in the dp cameras so how wide the lens is in the body is going to determine the characteristics of the tunnel effect.  Here is a picture of the converted camera with exposure pumped up to show the sensor well.

You can see the walls are pretty vertical compared to the walls in a nex camera.  Not sure which lenses will work the best.  Wide angle lenses are probably going to be the most problematic.

Mike

carrrlangas wrote:

DOCMAAS: "It appears that large focal plane distance lenses will only perform marginally in the corners while those designed to be closer to the film plane like konica, leica, contax g etc may be a better match for the dpm cameras."

Hmmm, I didn´t got to understanding this. Bummer, my point in all this is to use my Pentax K mount DA limited lenses, they have a register distance arround 40mm

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