is pleased to introduce the ultimate large aperture planetary instruments to
the US - the Lazzarotti Optics Gladius tubeless Cassegrains. The Gladius is the result of Mr. Lazzarotti's
long pursuit to perfect the high-resolution telescope. The combination of
world-class optics, open tubeless design, and no-compromise mechanics
results in an instrument that achieves the theoretical limits of what a
large aperture telescope is capable of. If your interest is
high-resolution observation and imaging of the planets and moon, there is no other
telescope that can consistently deliver this level of performance -
particularly in such an amazingly compact and usable package. We've
found the Gladius CF 315 to be as easy to mount and handle as a 6" APO, with
2X the resolution, 2X exit pupil size (no more floaters!), and 4X the light.
Each instrument is carefully assembled and checked
out by the head of optics (and well known planetary imager), Mr. Paolo
Lazzarotti. The optics of these instruments are produced to
exceedingly high tolerances, and certified to 1/25 wave RMS or better as a
CF 315 on a
Mr. Lazzarotti with Gladius CF 315
is now producing an innovative series of telescopes for discriminating
observers and imagers who need the very best tool for
planetary observation and imaging.
Itís called the
features a classical DALL-KIRKHAM
designed to deliver the very best performance for HIGH RESOLUTION
imaging, both visual and digital.
With guaranteed 1/25 λ RMS corrected
optics (or better) and a tiny 20% central obstruction, the GLADIUS
suffers from none of the
compromises you see with every
single commercial SCT on the market (typically 1/15 λ
RMS optics and a massive 33%
CERTIFICATE is provided with
Every part of the GLADIUS has
been designed to work at its best in any observing condition.
redundant parts have been
eliminated to produce an incredibly lightweight instrument which is
easy to handle and transport, both at home and abroad.
it isn't there it can't cause problems!
many ways the tube is the
least useful part of a telescope. It's basic purpose is to keep the
optics in place. But it's a very expensive item
speaking, special paint and accurate baffles are both required to
eliminate incidental light. The tube is also responsible for the most
crippling problems in a high-resolution instrument - persistent tube
currents and poor cooldown times. Typically, some combination of
fans or thermoelectric coolers are used in an attempt to counteract these
problems. Unfortunately, in most environments the use of fans
fails to adequately eliminate the problem, and often creates other
problems with image degradation, vibration, and dust circulation.
Expensive carbon fiber materials are
sometimes used to make the tube rigid and stable enough, but such tubes
cause even more thermal problems because the carbon fiber acts as an insulating
> Get rid of the tube and you
instantly eliminate heat plumes and spirals: even when the telescope has
been outdoors for just half an hour or less! And, provided the temperature
gap isn't too large, no ghost reflections will be seen because the air
surrounding the optics cannot reflect light! This means you can get up and
light isn’t an issue either: the GLADIUS is designed to gather only
on-axis light. No off-axis light can affect
your view at the eyepiece. With the Gladius the background sky level is
as dark as seen with the naked eye - or even better if there is some external
source interfering with your naked eye view.
can achieve this performance
thanks to our custom black velvet wrapped around every critical
surface along the light path. This is the most
effective material known for blocking extraneous light. Paint simply
isn’t up to the job because sooner or later dew will
painted surfaces shiny. But velvet absorbs moisture!
average humidity conditions our mirrors will only dew after many
hours of exposure to the night sky - especially the primary mirror
thanks to its high thermal inertia which keeps the glass slightly
warmer than the air. In any case an optional dewshield or heater belt
will ensure dry mirrors over a whole
night of observing.
primary and secondary mirrors are made of the finest Pyrex® 7740.
The innovative recessed spherical shape has been designed to avoid
the tiniest flexure caused by the weight of the mirror itself. The
effective central obstruction is only 20% (by diameter) in all versions of the
mirrors come with a classic
multi-layer 88% reflective aluminum coating with a protective layer of SiO2.
This quartz layer is specially enhanced to protect the mirror from
direct contact with the open
air. A spun aluminum cover protects the mirror during transport.
that a D-K f/25 optical system is much easier to use thanks to a
far higher tolerance to misalignment of the mirrors than any SCT,
Newtonian, or RC system working at f/10 will
this optical system
does not require additional elements to produce the right focal length
for imaging. The average
digital camera equipped with a small-pixel sensor (typically 4.5-6
microns) is the perfect solution for imaging with the
Gladius (CCD cameras with
larger pixel size may
require a small amount of image amplification when the seeing is
field of view is perfectly corrected up to 10mm in diameter, so most cameras up to
1.4-2 Mpixel can be used with no problems.
means there is literally nothing in the way of truly high quality
imaging: no more expensive barlows to reach that all-important image
scale; no more wasted photons from glass dispersion or
more ridiculously long optical trains causing image shift and
it isn't there it can't cause problems!
GLADIUS there are
only two reflections between the
planets and your chip or eyepiece!
is easily performed
by adjusting the secondary mirror with the usual 3 collimation knobs
and a central lock screw. The primary mirror is completely fixed and
comes perfectly aligned straight from the factory. Removal and
installation is easy, permitting disassembly for transport or mirror
May 23, 2008 - Primary
mirror shield, new secondary mirror support and much more...
- The primary
mirror is now protected by a lightweight carbon fiber shield which
prevents fingerprints and moisture. The shield can be added and
by hand in a very simple way with no tools. The shield position is such
that no boundary layers are usually seen during the final mirror
cooling down. In any case, the
shield should be used in critical conditions only.
The shield is included with the new GLADIUS
CF315 version and it can be purchased
separately for the GLADIUS CF250.
- The primary mirror cap now
features a built-in mask to reduce the full aperture down to 230mm
- The GLADIUS CF315 is now equipped with
the Baader Planetarium SteelTrack 2" focuser replacing the early
- The secondary mirror is now held by a
sectioned tube made of carbon fiber to improve the GLADIUS overall stability. Optically, this support acts
the same as the early aluminum ring with no
difference at all in terms of diffraction. Both the diameter and the
thickness are unchanged.
- A new pair of carbon fiber "swords" now run
alongside the rail to dampen high frequency vibrations in windy conditions and
on mounts delivering vibrations. These can be
removed when the telescope must be broken down in 2 parts. Length is
98cm and weight is about 50g each.
new Carbon Fiber Frame (CF Series) now available!
All components are precision
ensure perfect collimation in any position - especially around the
angle of the ecliptic where the GLADIUS chiefly does its work.
Obviously, the two parts can be disassembled and reassembled without affecting
the mirror alignment.
Feather Touch 2" focuser (with 1ľ" Reducer) is included with each Gladius
315CF, and a standard Crayford focuser is included with the 250CF.
Focusers attach to the rear cell through a standard external 2"x24tpi thread
(same threading used on commercial SCTs).
A standard Losmandy D Series dovetail allows
the telescope to be fitted to most equatorial mountings on the market.
PRICING | ORDERING
last updated 08/10/08