Celestron - EdgeHD 925 Optical Tube Assembly

SEE THE UNIVERSE IN HD
Introducing Celestron's New  
Aplanatic Schmidt Telescope Design! 

• visibly Sharper images 
• Superior performance 
• Enhanced Mechanical features 
• fastar® Compatible 

EdgeHD is an aplanatic Schmidt telescope designed to produce aberration-free images across a wide
visual and photographic 
field of view. The optical system was designed to reduce more 
than just off-axis star coma, but also to give an astrograph quality 
flat focal plane all the way to the edge of the field of view. 

True  Astrograph Quality 
Many optical designs that advertise themselves as "astrograph" quality actually only produce pinpoint
stars across a curved focal plane. While this may be acceptable for visual observing, stars will appear
out of focus at the edge when used with a flat chip sensor of a digital camera.  EdgeHD optics produce
a focal plane more than three-times  flatter than a standard Schmidt Cassegrain telescope and
dramatically flatter than other competing coma-free designs. This guarantees you visibly sharp stars
across some of the largest 
CCD chips available today. 

Improved Performance
Superior edge performance not only creates rounder, more pleasing stars but actually improves the
resolution and limiting magnitude when compared to telescopes of equal aperture. 

Starbright XLT® Coatings 
Coupled with Celestron's Starbright XLT coating group on every surface, EdgeHD optics gives you
maximum light throughput 
across the widest visual and photographic spectrum. 

FOCAL LENGTH - 2350 mm f/10
OPTICAL COATINGS - Starbright XLT
OPTICAL DESIGN - Aplanatic Schmidt