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[OM] Re: 18mm f3,5 and 7mm extension tube?

Subject: [OM] Re: 18mm f3,5 and 7mm extension tube?
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Fri, 01 Jun 2007 14:05:46 -0400
I put my 17/3.5 Tokina on a 7mm tube and found the focus to be about 
1-1/2" from the front element.

Chuck Norcutt

Dan Mitchell wrote:
>> is there anyone who tried the 18mm f3,5 with 7mm extension tube? I
>> rather like the wide-angle macro effect of the 21mm in combination
>> with the 7mm extension tube and wonder if a similar effect is possible
>> with the 18mm?
> 
>   Not quite the same, but putting a Vivitar 17/3.5 on a 7mm extension 
> tube, it isn't in focus _anywhere_.
> 
>   There's something weird going on, though, because even though it looks 
> as if the split-image portion of the screen is matching up, the rest of 
> everything is blurry. It's possible that the focal point is inside the 
> lens, of course.
> 
>   -- dan

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