Celestron's state of the art top notch optical EdgeHD system is an excellent option for users who want to image with the largest imaging sensors or view with the widest eyepieces.The Celestron EdgeHD 925 9.25" Optical Tube is the mid low aperture range of this series and with an ultra fast f/2 focal ratio when the secondary mirror is removed (f/10 when not removed), it is remarkable for imaging deep sky objects. In addition, the StarBright XLT coatings makes sure light transmission is as high as possible.

The aplanatic design of the Celestron EdgeHD 925 system removes the effects of coma and creates aberration-free images, but with the flat field optics, it also ensures a flat focal plane (three times flatter than a standard SCT) to the edge of the view, resulting in top notch resolution with pinpoint stars to the edge of the field, especially when using very large camera sensors.

• Image shift is reduced significantly with the Celestron EdgeHD 925; a significant advantage for long exposure astrophotography due to the mirror flexible tension clutches.
• Cooling is suffient due to the tube vents allowing hot air to be released from the primary mirror without letting dust in.
• While an f/10 focal ratio allows viewing of the smallest deep sky object, adding a barlow gives additional power for planetary observation. On top of this, the EdgeHD series are Fastar compatible and by removing the secondary mirror and replaced with a lens for a fast f/2 system for wide field imaging.