Summicron IV Aperture blades; Is this normal?
Old 06-08-2017   #1
everyXnewXday
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Summicron IV Aperture blades; Is this normal?

Hi, new owner of a 35mm Summicron iv. Is it normal for the aperture blades to show this much when wide open? Bokeh highlights aren't round.

Thanks!

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Old 06-08-2017   #2
pyeh
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Mine looks like it shows that much blade too, when fully open. I wonder what others will say.
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Old 06-08-2017   #3
Fraser
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i'm pretty sure mine is the same, the question has been asked a few times in the past I think its quite normal.
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Old 06-08-2017   #4
jonmanjiro
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Its actually an f1.85 lens but Leica has crippled it by installing a measly maximum aperture opening of f2! Sheesh!

Seriously though, I suspect its a deliberate design policy by Leica to reduce vignetting at maximum aperture.
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Old 06-08-2017   #5
benmacphoto
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I've owned two 35mm f2 version IV Summicrons.
One from 1984 and the other a late chrome German one.
The 1984 did not show aperture blades wide open, but the later German one did.
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Old 06-08-2017   #6
bucs
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Now I know why they released a Summarit 35/2.4



Kidding aside, Had a v4 and at f/2 i can also see the aperture blades
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Old 06-08-2017   #7
Jan Pedersen
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It is normal.
I had the same concern about my IV and was told by a Leica expert to look from behind the lens where the film or the sensor will peak from and the aperture blades will not be visible.
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Old 06-08-2017   #8
rodt16s
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Mine is the same, often wondered if it was supposed to be like this
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Old 06-09-2017   #9
eia41
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Same here. Looking at my 35 Summicron V4 from the rear, no blades are visible - but they are just about, seen from the front.
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Old 06-09-2017   #10
Richard G
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No aperture blades visible in mine at any angle at f2. Just kidding. Mine is German, a chrome one, and I can see this much aperture blade at a slight angle. This photo is a close up wide angle shot. If I hold mine at arm's length and look at the front you can barely see these aperture blades.
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Old 06-09-2017   #11
arthur berger
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Just checked my outstanding 35mm Summicron 4th and it is the same- no worries!
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Old 06-09-2017   #12
everyXnewXday
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Thanks everyone! While I'm at it, is it also normal for there to be an extra 1/3 stop or so after f/16? I.e., after f/16 the aperture ring turns a bit more (but less than 1/2 stop) and the aperture opening then becomes perfectly round. It is not quite round at f16.

Thanks again!
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