Re: Horizon 202 focus

[leongkt@xxxxxxxxx (Leong, Ka Tai)]

Tue, 10 Nov 1998 15:24:42 +0000 Willem-Jan Markerink wrote:

>But WHY do you want a diopter?
>The ONLY way to get both infinity and close-up in focus is stopping
>down....diopter or not....otherwise you loose either infinity or
>close-range. You only gain a little by decreasing the
>close-up focus with a diopter, but at the same time you'll need to
>stop down to keep infinity in focus....and the image degradation
>might be worse than the gain at close range....
>The practical problem is that very slight diopters are hard to find,
>and pretty expensive....all scientific supply stuff....
>(you can't buy a big one and cut several small ones out of it, no
>matter how smart your cutting....there is simply only one center to
>work with....8-))

I just have this crazy idea. It may not work. Anyway, I am not handy with
tools, so I have to rethink.

>Different films can indeed result in very different 'tension'....
>On my homepage, I have a chapter containing some tips and tricks to
>deminish this film-/perforation-ripping problem....which can happen
>with any film if you want to squeeze out those last few mm's of film for
>one more shot....
>
>http://www.a1.nl/phomepag/markerink/mainpage.htm

I have been to your very informative web site. Shall reread the relevant
pages again.

Changing to a new camera or new lens always gives me new ideas, and getting
them to work is the fun part.

Ka Tai

Leong Ka Tai
Hong Kong Institute of Professional Photographers

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