Re: [APML] Presbyopia and Fine Focus

["Jason Ware" <jtw@galaxyphoto.com>]

You may want to consider knife edge focussing. It makes this
issue a moot point.

----- Original Message ----- 
From: "Jim Vineyard" <deepskyphotos@hotmail.com>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Monday, July 25, 2005 1:18 PM
Subject: [APML] Presbyopia and Fine Focus


> Hi All,
>   Rather than wearing bifocals I've opted for two different pairs of
> glasses.  One is for general use and seeing distant objects and I can
> actually see things like small print quite clearly if I just hold it out
at
> arm's length.  I "had" only been "near-sighted" since age 12, but now I've
> got that "Presbyopia" thing going on for the last 2 or 3 years.  It is
bad!
>   My other new second pair is recommended for reading and seeing things
> "close-up".
>
>
>   So which pair should I wear for the most precise focusing by eye?
>
>
>   I figured the "close-up" pair, which I did use, but haven't got the film
> developed yet, since I believe I'm actually looking at a star's image on
the
> focusing screen and it is very "close-up" and even magnified 3x by my
right
> angle viewfinder.
>
>   But then I wondered am I actually looking "through" the scope at a
distant
> object and the image on the screen is just an image of this very distant
> object.
>
>   And here's the REAL KICKER, with stars in a dark sky I actually seem to
> see them better and sharper just looking around the sky, but in this case,
> it's actually while wearing my "close-up" pair!!!
>
>   I suppose I could waste several hours by goofing up one of two sets of
> stackable exposures, but I'd rather just ask those who already have dealt
> with the "Presbyopia" thing here.  "What a drag it is getting old" as Mick
> sings in my head!
>
>   The real answer is to get a Hutech knife-edge but I'm thinking twice now
> about further investment in film equipment.  My general plan is to shoot
> film for the rest of this year (at least) and then probably switch to a
new
> modified DSLR.
>
>   There used to be a real sharp ophthalmologist or optometrist here.  He
> would be great to hear from again on this subject and especially why I
> "seem" to see stars in the sky better with the "close-up" pair.  Man it is
> hard to get used to this entire eyesight thing!
>
>
>
> Thanks Very Much In Advance (TVMIA),
>
> Jim Vineyard
>
> (I'm 117 messages behind, but I'll catch up, and anyway I figure nobody
has
> been discussing Presbeopia.)
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