I am very happy to make you a bespoke
mask if you can't find one for your
It will take less than 1
minute to achieve perfect focus with
your new mask and will mean you spend
more time imaging photons rather than
Above is a f10 mask suitable for Schmidt
my own setup consisting of Celestron
C925 and William Optics ED102 Megrez
3mm thick Matt black
Acrylic so no reflective light.
Unlike ones made of ordinary Acrylic or
Perspex these ones will resist cracking and
breaking during normal use.
However they are NOT unbreakable so treat
them with the same care as you do with your
lenses and camera equipment.
Light weight so you wont upset the balance
on your scope.
Precision laser cut.
M6 black plastic bolts to hang the mask over
the front of your scope,
these are removable for easy storage of your
mask after focusing.
I mark the extended corner with reflective
tape this is so you can find it again in the
Also like most people I have from time to
time forgotten to remove the mask before
the bright reflective corner makes it stand
Unlike a Hartmann Mask which provides no
visual cues on the direction of travel
needed for focusing.
A Bahtinov mask clearly shows the direction
of travel needed to achieve focus.
Also, a Hartmann mask doesn't provide the
focus precision of a Bahtinov mask.
The pattern displayed in a Hartmann just
gets slightly more in focus, which means the
true focus may be off by a significant
shows you exactly where the perfect focus
point is every time, regardless of seeing
design also allows more light gathering than
a Hartmann mask allowing you to focus on a
much dimmer star.
Special sizes are also available, just let
aperture of lens or mirror
the outside diameter of your
SHIPPED IN "PIZZA" BOXES TO INSURE THEIR
SAFE ARRIVAL, ALSO THESE BOXES ARE EXCELLENT
FOR STORING YOUR MASK IN WHEN NOT BEING