Acuter LUMA-X 40ED H-alpha Solar Telescope

Designed for both H-alpha and white-light solar observation, the Acuter LUMA-X 40ED combines two solar observing modes in a compact 40 mm instrument.

Its dual-switch diagonal system allows the telescope to transition from H-alpha observation of prominences and other solar details to white-light observation of sunspots.

The objective incorporates one ED glass element intended to enhance image sharpness, contrast, colour accuracy and detail.

For H-alpha observation, the LUMA-X 40ED uses a 40 mm front-mounted etalon with a bandwidth below 0.6 Å and pressure tuning.

For white-light observation, internally mounted green and neutral-density filters allow sunspots to be observed.

With a 250 mm focal length and f/6.25 focal ratio, the telescope remains particularly compact, with an optical tube length of only 275 mm and a weight of 1.9 kg.

Dual H-alpha and White-Light Observation

The LUMA-X 40ED is designed for two types of solar observation:

• H-alpha
• White light

Its exclusive dual-switch diagonal system allows transition between the two modes.

In H-alpha, the telescope reveals activity in the solar chromosphere.

In white light, it can be used for sunspot observation.

40 mm ED Objective

Objective diameter is:

• 40 mm

It incorporates an ED glass element.

This element contributes to improved:

• Sharpness
• Contrast
• Colour accuracy
• Detail

40 mm Front-Mounted H-alpha Etalon

The H-alpha system uses a front-mounted etalon with a diameter of:

• 40 mm

Its bandwidth is:

• Less than 0.6 Å

This narrow bandwidth allows a range of solar activity to be observed.

Chromosphere Observation

In H-alpha, the LUMA-X 40ED can reveal:

• Solar flares
• Prominences
• Spicules
• Surface granularity
• Sunspots
• Other solar details

Pressure Tuning

The etalon uses a pressure-tuning system.

This allows the filter performance to be adjusted for H-alpha observation.

White-Light Sunspot Observation

The LUMA-X 40ED also incorporates:

• Green filter
• Neutral-density filter

These filters are internally mounted and are used for white-light sunspot observation.

8 mm Blocking Filter

The solar system includes an:

• 8 mm blocking filter

This filter is installed in the removable solar diagonal and forms part of the telescope's safety system.

90° Solar Diagonal

The LUMA-X 40ED is equipped with a solar diagonal:

• Angle : 90°
• Fitting : 1.25 inch

For solar observing, this diagonal forms an integral part of the instrument's safety system.

250 mm Focal Length

Telescope focal length is:

• 250 mm

Focal ratio is:

• f/6.25

5–16 mm Zoom Eyepiece

A 1.25-inch zoom eyepiece is supplied.

Its focal-length range is:

• 5 to 16 mm

With the supplied eyepiece, magnification ranges from:

• 15.6x
• 50x

Safe Solar Finder

A dedicated safe solar finder is supplied.

It allows the Sun to be located without looking directly through a conventional optical finder.

Light Shield

A light shield is supplied to improve comfort during solar observation.

Crayford Focuser

Focusing is provided by a:

• Crayford focuser

Solar Imaging Compatibility

The telescope can be used with CCD cameras fitted with a:

• 1.25-inch adaptor

Camera backfocus must be:

• 25 mm or less

Smartphone Adaptor Included

A universal smartphone adaptor is supplied.

It allows solar photographs to be taken with a smartphone for recording observations.

45 mm Dovetail Bar

The optical tube features a side-mounted:

• 45 mm dovetail bar

It also includes a:

• 1/4-20 tripod thread

SolarQuest Mount Recommended

The Sky-Watcher SolarQuest is listed as the recommended solar GoTo and tracking mount for the LUMA-X 40ED.

Compact Design

Optical tube length:

• 275 mm

Optical tube weight:

• 1.9 kg

Hard Carrying Case Included

A hard-shell carrying case is supplied to protect the telescope and accessories during storage and transport.

Solar Compliance

The LUMA-X 40ED meets the transmission requirements of:

• ISO 12312-2:2015

This certification concerns filters intended for direct observation of the Sun.

Solar Safety

Extreme caution is essential whenever observing the Sun.

The 8 mm blocking filter installed in the removable eyepiece diagonal forms part of the LUMA-X 40ED safety system.

For solar observing, the telescope must not be used with another type of diagonal.

Incorrect solar observing practices can result in serious and permanent eye damage.

Technical Specifications

• Manufacturer : Acuter
• Model : LUMA-X 40ED
• Manufacturer product code : 10981
• Type : H-alpha and white-light solar telescope
• Objective diameter : 40 mm
• ED glass : Yes
• Focal length : 250 mm
• Focal ratio : f/6.25
• Front etalon diameter : 40 mm
• H-alpha bandwidth : Less than 0.6 Å
• Tuning method : Pressure tuning
• Blocking filter : 8 mm
• Internal green filter : Yes
• Internal neutral-density filter : Yes
• Solar diagonal : 90°
• Solar diagonal fitting : 1.25 inch
• Supplied eyepiece : 5–16 mm zoom
• Eyepiece fitting : 1.25 inch
• Magnification with supplied eyepiece : 15.6x to 50x
• Safe solar finder : Included
• Light shield : Included
• Focuser : Crayford
• Dovetail bar : 45 mm
• Tripod thread : 1/4-20
• CCD camera compatibility : 1.25-inch adaptor
• Maximum camera backfocus : 25 mm
• Smartphone adaptor : Included
• Optical tube length : 275 mm
• Optical tube weight : 1.9 kg
• Carrying case : Hard shell
• Compliance : ISO 12312-2:2015

Package Contents

• Acuter LUMA-X 40ED telescope
• 40 mm front-mounted H-alpha etalon
• 90° solar diagonal with 8 mm blocking filter
• Internal filters for sunspot observation
• 5–16 mm zoom eyepiece
• Safe solar finder
• Light shield
• Universal smartphone adaptor
• Hard-shell carrying case