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Re: [OM] OM Metal Lens Hoods

Subject: Re: [OM] OM Metal Lens Hoods
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Wed, 14 Jan 2009 20:07:06 -0500
I think it's easier Moose's way.  You should get a rectangular 
projection from the film gate whose corners should *just* intersect the 
hood.  I tried this myself and discovered I needed a fairly bright light 
source behind the camera and reduced room illumination.  Damned hard to 
do with a DSLR though unless there's a compatible film body.

Chuck Norcutt


Moose wrote:
> Daniel Sepke wrote:
>> Since he hasn't piped up yet I will share the Moose approved hood testing 
>> method. You will need the following; a light box or other light source, some 
>> wax paper, your camera with lens attached and the hood under test. First
>> thing is to install the hood on the lens and place the camera nose down on 
>> the light box (obviously with the lens cap off!). Then open the back of the 
>> camera and place a piece of the waxed paper across the film gate. You should
>> then see a projection of the vignetting if there is any from the lens and 
>> hood combination. 
>>   
> 
> Interesting. Actually, I've always done the reverse, illuminating the 
> film plane and observing the image of the film opening on paper laying 
> on the hood.
> 
> Next time, I'll try them both.
> 
> Moose
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