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From: Kris (76.22.132.23)
Subject:         Observer III microscope, like new
Date: May 4, 2013 at 12:25 pm PST

This electric microscope was purchased from greatscopes.com a few years ago. We used it
only a few times and have kept it carefully stored in the case. This is a great opportunity to
get an excellent quality microscope, in like-new condition at a great price. This particular
model has been discontinued, but you can read about it here:

http://www.greatscopes.com/obs.htm (this is what I have printed below, with permission
from Greatscopes. Click link to see all illustrations.)

and here is a description of the case:

http://www.greatscopes.com/obs-a.htm#case

Non-smoking, no pet home. Asking $125 plus shipping. Insurance extra.

Thank you,

Kris


Below is printed the info from the greatscopes website, reprinted with their permission:

********************

The standard features on the Observer reads like the options list on many other microscopes.
All of these features are standard:

Quality optical glass DIN achromatic lenses yield 40x, 100x, 400x

Observer IV ($279) model also provides 1000x

Equipped with dual lighting for use indoors and out

Cool, bright, fluorescent lamp for indoors

Reflecting mirror for when power is unavailable

Precision Dual Focus (Coarse and Fine) with metal rack and pinion gearing system for long,
maintenance free life

Wide Angle Eyepiece, Achromatic objectives, parcentered and parfocal, DIN standard

Vinyl Dust Cover

Lifetime Warranty, 30-Day Money Back Guarantee, quality constructed in an ISO 9001:2000
Certified Factory

...features also found on the Observer III and IV ($229 & $279)

Swing-Out Filter Holder with blue and green filters included

Iris Diaphragm and Movable 1.25 NA Abbe Condenser

...optional equipment:

Mechanical Stage for precise slide movement

Teaching Head for dual viewing

Features | Comments | Secure Ordering | Top

Features:

The Observer is a well built instrument, loaded with features. It has standard features that
you would expect ... metal alloy body ... DIN Achromatic objectives... wide angle eyepieces ...
parcentered ... parfocal ... but it doesn't stop there.

This sturdy instrument (nearly 7 pounds) has gone the second mile in so many areas. It has a
rotating headpiece - that is, the very top portion of the scope rotates a full 360 degrees. So
any number of people sitting around a table can peer down through 40x, 100x, and 400x
lenses and see the wonder that has been so easily brought into focus. Easily because this
scope has not just one, but TWO focus knobs. One performs the "rough" focus, and the other
is a sensitive, fine tune focus. (This feature is essential at high powers - where focus is so
critical.) One more feature well worth mentioning is the 7 watt cool fluorescent light - which
yields a cooler and more natural light.

Here are the unique features of The Observer IId, III and IV:

• 10x wide field eyepiece - the lens in the eyepiece is nearly as large as a dime - brings
easier viewing for children and adults, producing clear, sharp images for the user

• 4x, 10x, and 40xr Achromatic objectives combine with eyepiece to provide 40, 100, and
400 power magnification.

• The "nose" of the Observer III scope is ready to accept a fourth objective, making it easily
upgradable to 1000x. The Observer IV model (at $279) comes pre-equipped with this fourth
objective (100xr). (The Observer IIdf has a three position nosepiece, and this and other
technical reasons make it unsuitable for a 1000x upgrade.)

• Coarse and fine focus adjustments (two knobs) yield quick & accurate focus. We have found
these separate knobs to be up to 20 times more accurate than microscopes with coaxial
focus.

• The fine glass optics on this scope are parcentered and parfocal - if you rotate the objective
to a higher or lower power, what was in the center of view before will still be in the center
(parcentered), and still in focus (parfocal). As a result, you'll spend more time viewing, and
less time repositioning your slide.

• Iris Diaphragm on the Observer III and IV (shown in photo) allows an incredible range of
light adjustment. The Observer IIdf has a disk diaphragm with six light settings.

• Seven-watt fluorescent 110vac illumination yields cooler and more natural colored lighting
while indoors where electricity is available. The tungsten lamps on other scopes can overheat
live specimens, and produce yellowish tinting. All three of our Observer models have this cool
fluorescent lighting.

• Inclined tube also rotates 360 degrees, allowing a number of individuals around a table to
view without moving the microscope - a great feature in an educational environment - or
anywhere where several students share a single scope. This rotating head rides on precision
ball bearings insuring smooth operation and minimizing wear and tear.

• Slip clutch protects the gear train from damage. When a child gets to the top or bottom of
the focus range, some will continue to forcibly turn the focus knob. The slip clutch allows the
knob to turn without grinding the gears.

• Focus tension adjustment holds your subject in focus, and is easily adjusted.

• Adjustable stage stop protects your objectives from damage.

• The included mirror assembly is easily installed when needed, allowing outdoor field use,
making the Observer a versatile choice (especially with the optional scope Carry Case!).

• Movable Abbe Condenser on the Observer III and IV, fixed condenser on the Observer IIdf.

• Eyepiece Pointer provides a point of reference for the teacher or parent to use in instruction.

• 122mm x 120mm Stage is pre-drilled and tapped for available mechanical stage

• 45 degree inclined head for ease of use while seated

• Metal alloy frame is finished with Chemical Resistant Coating

• Swing out filter holder with blue and green glass filters included

• Vinyl dust cover for protection

• 110v grounded electric plug

• 14 inches high 7.7 inches long 5.5 inches wide

• Weighs 6.8 pounds

Features | Comments | Secure Ordering | Top

Comments:

This excellent scope is loaded with all the features and potential that you are likely to ever
need in a student compound microscope.

The Observer has two focusing knobs. The first, the larger knob, is for course focus. It is
used to bring the slide or object into general focus. The second, smaller, knob is the fine
focus. This one changes the focus ever so slowly so that you don't speed right past "perfect
focus". That fine focus knob on the Observer is nice - especially at higher magnifications -
like 400x and 1000x. Remember that when you are magnifying something, you not only
magnify its width but its thickness. Imagine a single piece of paper being magnified 400
times - it makes it as thick as an 800 page book (making 400 sheets since pages are
numbered on both sides)! The fine focus gives you the fine touch needed to focus through
the the object and gives you the fine touch you need to find just the right "page".

Another great feature you should notice is the fluorescent light.

• Fluorescent light gives off very little heat. This can be important when viewing live
specimens (pond water), or anything that might have a tendency to dry out and die.

• Florescent bulb appears to the eye as a whiter, more natural light.

• Another nice advantage of the Observer's light is that the bulb is a common desk lamp bulb
which can be found in most larger home centers, like The Home Depot and Lowe's.

The Observer also includes an easily installed mirror (shown in photo), that permits you to
use your scope outdoors without electricity. Simply unscrew the light lens, and install the
mirror. This 15 second job can open up the outdoors in ways you never imagined!

The 40xr and 100xr objectives are retractable, i.e. spring-loaded, to protect your lenses and
slides should they come in contact. (The "r" in xr means retractable.)

The Observer is nothing less than a wonderful instrument, built for a lifetime of use, and well
worth the extra investment.



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