Sekor Z, RZ67 sync problems with digital back

[8dsf]

Hello,
Has anyone experienced x sync speed problems between digital back and sekor Z lenses? I recently purchased the Leaf Credo and HX-701 adapter plate thanks to Andy-anlerman from forum. The problem I am having is that sekor 110mm lens with the sync speed above 1/250 is not recognized properly. 1/250 is recognized as 1/350, and 1/250 as 1/500 . On my second sekor 50mm anything above 1/125 is already indicating as higher shutter speed. Obviously photos are underexposed... I have also sekor 127mm and this one is a bit better as it jumps to 1/500 only at 1/400. Anything below is synced correctly. I am using multipin (8-pin) cable from Leaf Credo to the sekor z lens. Camera and lens contacts are clean.
Does it mean that the lenses are defective ? I got both lenses recently from RobertsCamera so I believe this can be repaired ??
Any thoughts or suggestions?

Thanks
Adam

 

[buggz]

Which back specifically?
I have a Mamiya DM33 back, Mamiya 110/2.8, and RZ67 II Pro.
I will have to test the speeds and report back my findings...

 

[8dsf]

Hi Buggz
I am having Leaf Credo 40

Adam

Which back specifically?
I have a Mamiya DM33 back, Mamiya 110/2.8, and RZ67 II Pro.
I will have to test the speeds and report back my findings...

 

[buggz]

Hi Adam,

Are you seeing this as metadata in the files?
I don't see any Aperture, nor Speed information.
I've tried differing apps, ExifTool, C1, PS-CS6Bridge, FastRAWViewer(trial expired), etc...

I guess I can test this against my lightmeter, Sekonic L-758DR ?

Though, I don't seem to have any noticeable problems.

Ed

 

[buggz]

Oh, I see you are using an 8 pin cable from the lens?

I don't understand that, as I only have one simple cable.
From the lens PC sync port to the digital back.

I wouldn't think it is a lens problem, as two differing lens exhibt this problem?

You are using the light meter from the body?
I also have used the light meter of the body.
I also have the AE Finder, the 1st version with the knobs on the side, not the top.
I have used both, the body shutter speed, and the AE Finder speed.
I use the spot meter setting of the AE Finder, as I am used to that.
Though, I have not measured either against an external light meter.

Do you have an external light meter?

 

[8dsf]

Hi Buggz, thanks for your answer.
I do use external light meter only as I dont have the AE finder. I have re-tested all with three lenses and only one seems correct (127mm) , other two (110 and 50) unfortunately not.
Last week I sent both lenses for repair so I will let you know the results when I get it back...I hope.

Adam

Oh, I see you are using an 8 pin cable from the lens?

I don't understand that, as I only have one simple cable.
From the lens PC sync port to the digital back.

I wouldn't think it is a lens problem, as two differing lens exhibt this problem?

You are using the light meter from the body?
I also have used the light meter of the body.
I also have the AE Finder, the 1st version with the knobs on the side, not the top.
I have used both, the body shutter speed, and the AE Finder speed.
I use the spot meter setting of the AE Finder, as I am used to that.
Though, I have not measured either against an external light meter.

Do you have an external light meter?