What are the advantages of fused
Fused quartz is an amorphous, high-purity,
non-crystalline material made by fusing natural quartz at a very
high temperature. Often used in research grade telescopes,
fused quartz is an outstanding mirror
substrate material offering extreme thermal stability.
quartz has only 1/6th the thermal expansion of Pyrex and
borosilicate glass. This means that a fused quartz mirror will
hold its figure better as temperatures change over the course of an
evening. This stability translates into sharper images and a
more stable focus for fused quartz optics AG Optical Systems
What is the difference between Fused
Quartz and Fused Silica?
Well annealed, quality fused quartz and
fused silica are extremely similar, high purity materials with
virtually identical mechanical properties (extremely low
thermal expansion and excellent stiffness, two of the main
mechanical properties of permium, thermally stable optical substrate
materials). Both are an excellent, premium level material for
telescope mirrors. Fused silica is more transparent making it better suited for use in optical windows or
optics where UV transmission is important.
AG Optical Systems' optics supplier
(Ostahowski Optics Inc.) carefully checks the anneal of every fused
quartz mirror blank to ensure no internal stress is present.
How do you test the optics in my
AG Optical Systems has a multi-step testing
process to ensure that the optics you receive will perform to a high
standard. Our first step is to source our optics only from
well-established, professional optical suppliers who have shown that
they can deliver
a high-quality optics. Interferometric testing is used on each
and every AG Optical telescope providing a rigorous test of the
optical system. Each AG Optical system is provided with test
results showing the Strehl ratio and RMS wavefront error of system.
Very few telescope manufacturers offer interferometry test results
with their telescope systems as it is expensive and time consuming
to perform. AG Optical Systems understands that purchasing an
AG Optical Systems telescope is a significant investment. We
believe you show KNOW the quality of the optics in your scope is
good rather than just hope it is.
Interferometry is used extensively in the defense, aerospace,
scientific, and commerical industries to test the performance of
Why is the CCD field not
AG Optical Systems carefully centers the
secondary mirror on the optical axis of the telescope system on our
bench. We use a high quality laser collimation tool as well as
measuring tools to center the secondary. However, the
adapters, collimation tools, and imaging train used by a customer
may have a slight amount of tilt (it takes very little over the long
distance from the focal plane to the secondary) that cause the
secondary to be slightly decentered relative to the optical axis of
the imaging train. This is completely beyond AG Optical
Systems' ability to control as we do no make the adapters,
collimation tools, or imaging equipment used by our customers.
When this happens, field illumination may be slightly unbalanced
towards one side of the chip. Fortunately, the same effect is
present for field flats so there is no overall impact on the final
How long will it take to get my
The typical delivery time for an AG Optical
Systems telescope ranges from 3 to 10 months depending on the type
of astrograph you order. While AG Optical
Systems attempts to deliver each telescope as soon as possible,
are dependent upon suppliers who have production schedules over
which AG Optical Systems has no control. One thing of which
you can be sure is that AG Optical Systems is constantly striving to
reduce delivery times and will keep you well-informed should any
How do I place an order?
AG Optical Systems requires a 50%
deposit of the total value of the product you order. Once we
receive this deposit we will begin the process of building your
scope. When the telescope is completed and ready to ship, AG
Optical Systems will contact you with the balance due on the
telescope. The telescope will be shipped when AG Optical
Systems receives the balance due on the order. Do not
assume you have placed an order until you explicitly request
the item and have received an invoice from AG Optical Systems that
lists the item.
Can an iDK telescope be used
Yes. Any iDK telescope can be used for
visual observation using common eyepieces and eyepiece adapters.
What is the AG Optical Systems
Thermal Control System?
The AG Optical Systems Thermal Control
System consists of a PC application, primary mirror cooling fans,
primary mirror heater, secondary mirror heater, and three
temperature sensors. Based on user defined settings, the
system will automatically trigger
cooling fans and/or heaters to speed the cooling of the primary
mirror while preventing the formation of dew on the primary mirror
and secondary mirror.
Who makes your optics?
We use US manufacturers for our corrector
elements to ensure consistent and reliable quality for these
critical components. Our mirrors are manufactured by
Ostahowski Optics. Ostahowski Optics has decades of optical
manufacturing experience and is well-known for producing high
for public and private sector markets.
How will my telescope be shipped?
AG Optical Telescopes are
shipped in an extremely study, wooden crate
built specifically for each telescope type. Each crate is
foam-lined while the telescope itself is securely wrapped with
several layers of bubble wrap. AG Optical Systems uses
well-established freight shipping companies to securely transport
your telescope to whatever destination is required.
Does AG Optical Systems sell
Yes. Please contact AG Optical Systems
to learn more.
What is included with my AG Optical
Each AG Optical Systems telescope ships with
the optical tube assembly and a power cable for the primary mirror
If you order a Thermal Control System (TCS)
you will receive additional power cables for the TCS, a 3' USB
cable, and three sensor/fan/heater color-coded cables.
Please visit our
support page to read the
telescope and Thermal Control System manuals.