Hi Brian,
One alternative is to see if any of your friends have telescopes,
and borrow an eyepiece from them. Turn the eyepiece around to make
a nice magnifier.
As far as the Edmund microscopes; they used to sell one that used
DIN microscope parts (much better glass all around) if this is what
they are still offering, go for it. All that said, however, Pentax
makes a 8 X 32 monocular that has a close up attachment, allowing
a 25 power (IIRC) microscope. Excellent performer, I use it to locate
pits in telescope mirrors while they are in work.
Tom
Tucson, AZ
Date: Wed, 9 Oct 2002 10:33:26 +1300
From: "Brian Swale" <bj@xxxxxxxxxxxxxxx>
Subject: [OM] ( OM ) examination of transparencies of targets
Hi folks,
Some months back I made transparency photos of Patterson Photo
Resolution targets (or whatever they are called), to test several of my
lenses.
Then I was faced with finding a satisfactory means of examining these
slides.
I projected them on a screen, but soon gave that up as a method as it
quickly became apparent that my projector lens was not up to the task, and
I could not find a substitute that could reliably be described as being
significantly better. No-body knows, or if they do, aren't telling !!
Dreammoose suggested using a microscope. I *could* ask an old work
colleague if I can invade his lab for this purpose, but I am reluctant to
do so.
An alternative is the amazingly inexpensive pocket microscopes marketed
by Edmund Scientific. Two powers - 20?x and 50x.
Does any list member have experience to advise me what range of
magnification I might find suitable for this purpose? I want to count lines
per
mm on the slide.
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