Re: Need Objectives For B&L Stereozoom 7
- From: Joe <see_real_one@xxxxxxx>
- Date: Thu, 19 Feb 2009 09:27:40 -0500
On Sat, 14 Feb 2009 14:05:43 -0600, Richard J Kinch
<kinch@xxxxxxxxxxx> wrote:
Joe writes:
These objectives are just a single piece of glass each - not compound
lenses.
B&L Stereozooms have separate objectives for each eye. I think you mean
the additional multiplier lens that screws on below the objectives to
boost the magnification. These are just ordinary achromatic lenses of a
weak power (one Nissho item in hand reads 1.5X and is just a 600mm focal
length lens) like you could get from premium suppliers like
edmundoptics.com or mellesgriot.com, or cheaply from surplusshed.com or
anchoroptics.com.
If you can disassemble the old cell you might find a new lens that fits,
if you're not equipped to otherwise improvise a cell mount. I don't
have a B&L cell in hand, just pods, but from the female thread on the
many pods I have, it looks to be an either M38x0.75 or 1.5-32 thread.
You do understand the scope works without this lens, right?
(If you send me your ruined one, I can remount a new lens in it in
exchange for the chance to reverse-engineer your specimen.)
This frosting problem may have been due to this instrument being widely
used in the semiconductor processing industry. Maybe somebody was using
the scope to watch a wafer etch progress while washing in hydrofluoric
acid. Kinda makes you wonder about the watcher's lungs.
Thanks for the return mail, but...
No, it's the actual objectives that I need. They are just a single
piece of glass, as I said, and they mount above the accessory "port".
It requires a bit of finesse to extract them from the mount, but in
the end, it's just two lenses that fit together like a jigsaw puzzle
(it's a close fit). It's sort of hard to describe in words, especially
since I haven't had them apart in a while. I initially removed them
thinking that the mess was on the upper face of the lenses, and they
just needed a good cleaning; that's when I discovered that the problem
was on the bottom faces after all, just not amenable to my
ministrations.
I actually do have an accessory magnifier for this scope, but ISTR
that it actually snaps in, rather than screws in (my Stereozoom 3 does
have screw-in accys, though).
I, too, wonder what the hell could have caused the etching,
particularly since there is no sign of corrosion on the metal parts of
the scope. Maybe someone was just stupid-careless with the optics, and
cleaned them with scotch-brite?
Anyway, I would really like to get this thing going, as it would be a
nice addition to my collection, and it has a very good working
distance - good for micromounting use.
Joe
.
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- From: Richard J Kinch
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