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I recently bought this used 21mm viewfinder. Why are there two frames? Which on is for 21mm and what is the other? Thank you for your help.

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The other is the parralax compensation frame, so as you get closer you use the alternate more inset frame.

The CV 21mm Finder is very good, brighter than even the Leica equivalent.

Edited by 250swb
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The parallax correction in the ones I've seen is a dotted line below the top frame line to correct for vertical parallax as one moves closer.  Since the angle of view does not change as one moves closer, these frame lines suggest the viewfinder might be the  21mm - 25 mm version or intended to work on the M8 with its 1.33 crop factor.

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21/25 combo looks like this:

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18 hours ago, Mucleica said:

I recently bought this used 21mm viewfinder. Why are there two frames? Which on is for 21mm and what is the other? Thank you for your help.

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 This viewfinder was released with the original CV ltm lenses.  As far as I aware, the outer frame is for 21mm and the inner frame is for 25mm and have nothing to do with parallax correction or the cropped sensor of the M8.  

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57 minutes ago, cp995 said:

Yes, but there was a finder 21/25mm in the plastic version too!
You can see that the frames are similar.

 

Cameraquest site has 21/25 plastic VF mentioned on Leica lenses page, but I can't find any photo of it viewfinders page.

Picture in OP shows it for sure.

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vor 2 Stunden schrieb Ouroboros:

 This viewfinder was released with the original CV ltm lenses.  As far as I aware, the outer frame is for 21mm and the inner frame is for 25mm and have nothing to do with parallax correction or the cropped sensor of the M8.  

Yes, I bought it together with a CV 21mm f4 lense. But I don't know if they were a bundle from the beginning.

 

But I guess for taking pictures to use the outer frame for 21 mm is correct? 

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16 minutes ago, Mucleica said:

Yes, I bought it together with a CV 21mm f4 lense. But I don't know if they were a bundle from the beginning.

 

But I guess for taking pictures to use the outer frame for 21 mm is correct? 

Yes, the outer frame lines are for your 21mm.

ETA:  The viewfinder was  originally sold seperately to the lenses iirc.  If your main use for the 21mm is landscapes, you'll find the vf is accurate enough

Edited by Ouroboros
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