VC 12mm/5.6 Heliar mated to M240

[arthury]

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Yes, Nick, one of these days, we should send mails to Cosina to harass them to give us a list.

 

Whatever it is, I think this lens has potential.

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[Mantice]

I confirm the 11134 remove many of the color cast and some vignetting of the lens on M240.

 

However the whole front housing of my 2-days old lens just wobbles - I hear this is normal?

 

[arthury]

I confirm the 11134 remove many of the color cast and some vignetting of the lens on M240.

 

However the whole front housing of my 2-days old lens just wobbles - I hear this is normal?

 

 

Look at post #19 of this thread.

Lens profile 11606 is a better profile for the VC12mm. It was tested by Zeiss for their 15mm Distagon and looks like it worked much better than the 11134.

 

Mine does not wobble. If it wobbles too much, you can always contact Cosina and send it in to get it tightened up.

[Mantice]

Look at post #19 of this thread.

Lens profile 11606 is a better profile for the VC12mm. It was tested by Zeiss for their 15mm Distagon and looks like it worked much better than the 11134.

 

Mine does not wobble. If it wobbles too much, you can always contact Cosina and send it in to get it tightened up.

 

I just give it a try in my kitchen with white edge walls and yes, it does remove that last faint bit of color~ vignetting is about the same, but now 12mm heliar is basically fully useable on M240, sweet!

 

But my trip is tomorrow and its late night here already - gosh I hope I discover this wobble thing earlier and it is very annoying - 2mm diameter movement of the whole front housing (include element groups)

[arthury]

I just give it a try in my kitchen with white edge walls and yes, it does remove that last faint bit of color~ vignetting is about the same, but now 12mm heliar is basically fully useable on M240, sweet!

 

Glad it worked out well for your lens.

 

But my trip is tomorrow and its late night here already - gosh I hope I discover this wobble thing earlier and it is very annoying - 2mm diameter movement of the whole front housing (include element groups)

 

If it's light-fast (i.e. no light leakage), then don't worry about it and get it fixed after the trip. But, I'd take a long a wide angled lens (closest substitute) in case things go south during your trip.

[jankap]

What is meant by "wobbling"?

Look, at 12mm lens focus an axial play of say 0.01mm is more serious than the same amount at a 50mm lens.

At APS-C it serves as a 18mm lens, it is a very nice and sharp lens.

Jan

[Mantice]

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It means the whole front assembly (include the whole optical chamber) can be twist left-right few millimeter with a light 2-finger twist. It doesn't seem to affect axial but who knows, I do not feel confidence IMO.

 

Later found out it is common in smaller voiglander lenses, except mine is more extreme and require re-tightening. Get a hold of a VC lens and lightly holding the mounting area and front (in my case the built-in hood) in separate hand, light twist, and you'll know what I mean.

 

I found this and I don't know if this applies to 12mm

[Nick_S]

I found this and I don't know if this applies to 12mm

Thanks for the link. I have no mechanical issues with my new 21 mm/F4.0 Color Skopar Pancake II, but is good to know that this is a minor adjustment if required that I can ask of a camera technician.

 

Nick