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Re: [OM] teleconverters and depth of field question

Subject: Re: [OM] teleconverters and depth of field question
From: "Marco" <tom@xxxxxxxxxxxx>
Date: Mon, 31 Aug 1998 23:53:29 +0200
>>Yes, that is why it is the same.
>
>No, DOF is halved.
>
>>The TC *enlarges* your image. That is all. The dof cannot vary. If 
>>you had a
>
>Here is an example:
>A 200 mm lens at F=4 focused at 30 m has a depth of field from 27.33 
>- 33.25 m. (5.92 m)
>This lens with a teleconverter (which gives a 8.0/400 lens) has a 
>depth of field from 28.65 - 31.49 m. This is 2.84 m , about the half.
>The numbers are from F.Pangerl "Die Welt des OM Systems".

I think you are right. Since the circle of confusion doubles too, you get
half DOF. Sorry for *my* confusion. 

One could consider it to be the same only if could use all the doubled image
on a 120 film for instance. 

Marco

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