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08-31-2012, 06:43 AM   #1
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Pentacon 135 - which have 15 aperture blades?

Hi

I've noticed there are different versions of the Pentacon 135. Is it possible to determine which lens has 15 aperture blades by the design?

Thanks

08-31-2012, 07:12 AM   #2
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I have the 'zebra' version, which is just a relabeled Meye Orestor. It definitely has 15 blades.
10-21-2012, 03:10 PM   #3
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Ive noticed that the ones which are fatter in the middle part has 15 blades.
10-22-2012, 12:30 AM   #4
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Pentacon 135mm f2.8 -
The older version has 15 blades.
The newer 'Pentacon Auto' has 6 blades, but semi rounded. I have the newer version. Sharp wide open, even sharper step down.

At f4, the iris still produces perfect round circle. Unless you are demanding round high ligh bokeh, and using smaller than f4, there is no point to get the older version.

Sample images, using on k20d

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