Re: Nishika Macro

[P3D Larry Berlin <lberlin@xxxxxxxxx>]

>Date: Sat, 25 Oct 1997 
>From: P3D john bercovitz  writes:
>
>
>>LeRoy Barco writes about macro:
>>
>> The "one in thirty" rule can be jettisoned for this kind of work... 
>> it all depends on your (and your audience's) toleration for the 
>> amount of depth in the image... the closer you get, in general, 
>> the less depth you'll want in your scene... and the less DOF you 
>> have, too.
>
>This is good advice.  The 1 in 30 rule applies to normal stereo pix
>taken with infinity in the picture.  Two criticisms of it, though: 
>1] it is a degenerate form of the rule that says that the on-film 
>deviation shouldn't exceed 1.2 mm (1/30 of the focal length of the 
>system) and 2] both the 1 in 30 rule and the 1.2 mm rule are too 
>conservative under many conditions, especially those which have a 
>gentle change in depth, the extreme example being a picture of a 
>featureless grassy field with infinity at the top of the frame and 
>something very near at the bottom of the frame.
>

******  I find that the 1:15 rule is closer to what I like in stereo images.
All too frequently the 1:30 rule leaves things looking too flat. Of course
each image circumstance has it's own characteristics... Anytime I'm in
doubt, I bracket by taking another shot at a different separation and use
whichever combination works the best.

About that infinity factor, has anyone rigged a device to carry around with
the camera gear that holds a dark screen behind your subject to eliminate
infinity where useful? Of course it's most useful for eliminating other
competing objects much closer to the subject. I use a large black
posterboard for shots taken at home, but it would be cumbersome to carry and
use in other places. At home it gets hard to use if a breeze kicks up.  I've
been wondering if a some kind of fabric screen could be rigged for a more
portable system in the field?

Larry Berlin

Email: lberlin@xxxxxxxxx
http://www.sonic.net/~lberlin/
http://3dzine.simplenet.com/


------------------------------