Archived posting to the Leica Users Group, 2002/06/24

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Subject: Re: [Leica] Summicron Hood on Summilux?
From: Henning Wulff <>
Date: Mon, 24 Jun 2002 21:59:18 -0700
References: <000201c21ba3$57c8ecc0$94ed0e50@steveuns> <>

At 10:33 AM +1000 6/25/02, Paul Jones wrote:
>Hi Steve,
>I have been wanting to put an ASPG Summicron hood on my Summilux for a
>while, but have been concerned about it vignetting also. Would you be able
>to put the hood on your summilux and take a shot to see if it is okay?
>----- Original Message -----
>From: "Steve Unsworth" <>
>To: <>
>Sent: Tuesday, June 25, 2002 3:19 AM
>Subject: RE: [Leica] Summicron Hood on Summilux?
>>  Dunno, but it certainly fits. I have both lenses and I'd never thought
>  > of try the ASPH hood on the old Summilux.
>  >

Taking a shot doesn't do it. It will tell you if you think it might 
be good enough to get by and the corners don't get completely dark, 
but that's not the way to do it.

Put the lens (old Summilux) on the camera, open the back and put the 
camera on B. Using a locking cable release, lock the shutter open. 
Look a the back when the aperture is set at f/1.4. When holding the 
camera so that you can look through one of the corners of the film 
plane aperture from the baack. See what the lens opening looks like. 
Now put on the hood. Does it cut into what you can see of the lens 
aperture? Then it vignettes.

You can also do this by looking through the front, with the lens hood 
in place. Hold the camera up so that you can see the corners of the 
film plane aperture through the lens from the front. If the lens hood 
interferes in any way with your seeing the corners through the full 
lens opening, then the lens hood vignettes.

All this is standard practice when using large format with movements. 
There you often get into strange lens positions with compendium hoods 
that you have to wrestle into non-vignetting positions in the field. 
Since I've written about this once a year here, there should be 
further references in the archives.

I don't have an old Summilux at present, but I believe the hood does 
vignette. It's better to get the right one, the 12504.

- -- 
    *            Henning J. Wulff
   /|\      Wulff Photography & Design
  |[ ]|
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Replies: Reply from "Paul Jones" <> (Re: [Leica] Summicron Hood on Summilux?)
In reply to: Message from "Steve Unsworth" <> (RE: [Leica] Summicron Hood on Summilux?)
Message from "Paul Jones" <> ([Leica] Summicron Hood on Summilux?)