The AstroMaster 114 models have a 1000 mm focal length. Why are the tube...

No. Both tubes are identical in optical design. The reason the tube is so short is because the optical design incorporates a Barlow lens built into the focuser. This lens...

The AstroMaster 114 models have a 1000 mm focal length. Why are the tube...

No. Both tubes are identical in optical design. The reason the tube is so short is because the optical design incorporates a Barlow lens built into the focuser. This lens...

What is the optimized image circle for the EdgeHD OTAs and Reducers?

The EdgeHD optics are designed to optimize an image circle 21mm in radius from the center of the field of view. Doubling this figure gives an image circle 42mm in...

What is the optimized image circle for the EdgeHD OTAs and Reducers?

The EdgeHD optics are designed to optimize an image circle 21mm in radius from the center of the field of view. Doubling this figure gives an image circle 42mm in...

How do my EdgeHD mirror support knob flexible tension clutches work? Wil...

The EdgeHD mirror clutches apply tension to a flexible rod attached to the primary mirror support. With enough tension from both clutches, they are effective greatly lessening mirror shift or...

How do my EdgeHD mirror support knob flexible tension clutches work? Wil...

The EdgeHD mirror clutches apply tension to a flexible rod attached to the primary mirror support. With enough tension from both clutches, they are effective greatly lessening mirror shift or...

My image shifts when I’m focusing my SCT and after I get a great focus, ...

All Celestron SCTs and some Maks adjust focus by sliding the primary mirror along a set of nesting baffles inside the main tube. This is done by an arm to...

My image shifts when I’m focusing my SCT and after I get a great focus, ...

All Celestron SCTs and some Maks adjust focus by sliding the primary mirror along a set of nesting baffles inside the main tube. This is done by an arm to...

How do I collimate my telescope by using the stars?

Night Time Star CollimationAfter successfully completing daytime collimation, night time star collimation can be done by closely adjusting the primary mirror while the telescope tube is on its moun...

How do I collimate my telescope by using the stars?

Night Time Star CollimationAfter successfully completing daytime collimation, night time star collimation can be done by closely adjusting the primary mirror while the telescope tube is on its moun...

How do I collimate my Schmidt-Cassegrain telescope (SCT)?

Collimation of a SCT is critical to getting the sharpest images possible, especially when viewing planets at high magnification. There are three stages to a really good collimation using the...

How do I collimate my Schmidt-Cassegrain telescope (SCT)?

Collimation of a SCT is critical to getting the sharpest images possible, especially when viewing planets at high magnification. There are three stages to a really good collimation using the...