[photo-3d] Re: Newbie question-near point distance

["Michael K. Davis" <zilch0@xxxxxxxxxxxx>]

Hi Clement!

>Message: 9
>   Date: Wed, 25 Apr 2001 16:55:33 -0000
>   From: ve2cmt@xxxxxxxxxxxx
>Subject: Newbie question-near point distance
>
[snip]
>
>Please someone tell me if the 1/30 rule is still appropriate when 
>using 35mm lenses instead or normal 50mm or 55mm. If not, what would 
>it be? 
>
[snip]
>Clement

Let me answer your question.  A wee bit of math is required, which you
might find impractical or simply unappealing, but the accurate answer to
your question is this:

New base = Original base * (Original Focal Length / New Focal Length)

So, assuming you like the results you get when using the 1/30 rule to
calculate base for a 50mm lens, you should be content with the results had
when using a 35mm lens by multiplying the 1/30 base by the ratio 50/35.   

Similarly, if your normal lens is 55mm, then multiply the 1/30 base by
55/35 when using the 35mm lens, to compensate for the change in focal length.

Mike








 

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